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HOOK-UP 2400 USER'S MANUAL __________________________ FIRST EDITION NOVEMBER, 1987 COMPUTER PERIPHERALS, INC. 2635 LAVERY COURT #5 NEWBURY PARK, CA. 91320 (805) 499-5751 1 Notice ______ Computer Peripherals, Inc. reserves the right to make improvements in the product described in this manual at any time and without notice. Every effort has been made to insure against any inaccuracies or oversights in this publication however Computer Peripherals, Inc. can not be held responsible for any loss of information stemming from the use of the Hook-Up 2400 modem card. Trademark Acknowledgments _________________________ BITCOM is a trademark of BIT Software, Inc. Smartmodem 2400B are trademarks of Hayes Microcomputer Products, Inc. Touch Tone is a registered service mark of American Telephone and Telegraph. IBM PC is a registered trademark of International Business Machines. 2 TABLE OF CONTENTS _________________ Preface .......................................................... 4 Chapter 1: Getting Started....................................... 5 1.1: Review Your Modem Package ............................ 5 1.2: Read Your Computer Hardware Manual ................... 5 1.3: HOOK-UP 2400 Installation ............................ 6 1.4: Intallation Testing .................................. 9 Chapter 2: Modem Operation ...................................... 10 2.1: Command Guidelines ................................... 10 2.2: Result Codes ......................................... 12 2.3: Transmission Speed ................................... 13 2.4: HOOK-UP 2400 AT Command Definitions .................. 14 2.5: HOOK-UP 2400 S-Register Definitions .................. 21 Chapter 3: AT Command Set Applications .......................... 28 3.1: Dialing .............................................. 28 3.2: S-Register Programming ............................... 30 3.3: Answering ............................................ 31 3.4: Moving from On-Line to Command Mode .................. 32 3.5: Moving from Command Mode to On-Line .................. 33 3.6: Changing between Voice and Data ...................... 34 Chapter 4: Troubleshooting ...................................... 34 4.1: Dumb Terminal Mode ................................... 34 4.2: Local Analog Loop Back Test .......................... 35 4.3: Local Analog Loop Back Test with Self Test ........... 35 4.4: Make sure your computer recognize the HOOK-UP 2400 ... 36 4.5: HOOK-UP 2400 does not dial ........................... 37 4.6: HOOK-UP 2400 dials but does not connect .............. 37 4.7: HOOK-UP 2400 connects to the remote station but can not sign in .................................. 37 Appendix A: HOOK-UP 2400 AT command summary ...................... 38 Appendix B: HOOK-UP 2400 S-Register summary ...................... 40 Appendix C: HOOK-UP 2400 Power UP configuration .................. 41 Appendix D: Electrical Specifications ............................ 42 Appendix E: FCC Registration ..................................... 44 Appendix F: Tow years warranty ................................... 45 3 PREFACE _______ The Hook-Up 2400 is an integral 2400 Baud telecommunication device designed for use with IBM-PC, XT, AT and all true compatibles. The Hook-Up 2400 is compatible with CCITT recommendation V.22 bis, V.22, Bell 212A, 103 and Hayes Smartmodem 2400B. The Hook-Up 2400 automatically dials or answers calls and also will match the baud rate to the calls being made from distant computers. A HI-FI Speaker mounted on the card lets you listen to call progress tones to warn you of busy, connection or wrong numbers. As an intelligent data communication system, the Hook-Up 2400 requires minimal user installation effort. Besides the jumper settings for COM port and interrupt level, there are no other switches to be set. All configuration settings and diagnostic features can be invoked through user key board. The modem can detect and execute Hayes compatible commands from the user and send back result codes in optional English word or decimal digit form. The Hook-Up 2400 is approved by the Federal Communication Commission (FCC) for direct connection to any telephone system in the U.S.A. 4 Chapter 1: Getting Started ___________________________ 1.1 Review Your Modem Package (Inventory checklist) Your Hook-Up modem package should consist of the following items: - Internal Hook-Up modem card. - A modular telephone cable to connect the modem to the telephone line. - One floppy diskette for Hook-Up 2400 User's Manual. - Installation instruction for Hook-Up 2400. - One communications software package with manual and program diskette. If your package is incomplete, contact the source from where you purchased the Hook-Up 2400. 1.2 Read your computer hardware manual A "COM" port is used by the IBM Personal Computer (PC), PC/XT, PC/AT and the PC Portable as an "address" of a serial communications device such as a modem or printer. The address tells the IBM Personal Computer where the device is located. Since IBM does not support COM3 and COM4, the communications software manufactures can define COM3 and COM4. The COM Port address and Interrupt line (IRQ) of COM3 and COM4 can be different from each manufactures. For these reasons, if you use COM3 or COM4 on your PC, check with your computer hardware manual and call the communications software manufacture to verify COM3 and COM4 support. Some personal computers have used a certain COM port for their own purpose. If you are going to using an HOOK-UP 2400 with a CORONA PC, AT&T PC, LEADING EDGE, EAGLE PC, COLUMBIA PC, or the ZENITH PC, please make sure what COM ports are available for you. 5 1.3 HOOK-UP 2400 Installation Your Hook-Up 2400 is equipped with three jumpers located on the board for easily configuring multiple options. The jumper settings from the factory is COM1 ( port address: 3F8 - 3FF interrupt line: IRQ4 ) 1.3.1 HOOK-UP 2400 physical layout and component locations _____________________________________________________ | | | | | | | | | ___________ | | | | _____| | | | | | | | | |line | | | | |_____| | | | _____| | | speaker | | | | | | |phone| | |___________| |_____| | __________________ _ | | | | | || <--- speaker | | U 9 | |_|| volume | |__________________| | control | __________________ | | ADDR --------> 2 X 1 | | | | 4 Y 3 | U 13 | | | |__________________| | | ___________________ 3 | | | | 4 Z 2 <---------- IRQ | | | U 14 | 5 | | |___________________| | |___________ _______ | ||||||||||||||||||||||||||| | | ||||||||||||||||||||||||||| |_______| 6 1.3.2 Select COM Port Address The configuration need not be changed if the modem can be in COM1. If the modem cannot reside in COM1, the modem can be reconfigured using the jumpers to move it into COM2, COM3, or COM4. You may select one of the communications port address using jumper X and Y. _________________________ ___________________________________________ | | | | | ADDR | | COM JUMPER X JUMPER Y PORT ADDRESS | | ______ | |___________________________________________| | | | | | 2 [X 1] | | COM1 X & 1 Y & 3 3F8 - 3FF | | | |___________________________________________| | | | | | | | COM2 X & 2 Y & 3 2F8 - 2FF | | 4 [Y 3] | |___________________________________________| | | | | | default setting is COM1 | | COM3 X & 1 Y & 4 3E8 - 3EF | | and [ ] indicates two | |___________________________________________| | points are connected by | | | | the jumper | | COM4 X & 2 Y & 4 2E8 - 2EF | |_________________________| |___________________________________________| 1.3.3 Select Interrupt Line Using jumper Z you may select IRQ2,3,4, or 5. Only one of IRQ can be select at a time. _________________________ ___________________________________________ | | | | | IRQ | | INTERRUPT JUMPER Z | | _____ | |___________________________________________| | | | | | 3 | | IRQ 2 Z & 2 | | | |___________________________________________| | [4 Z] 2 | | | | | | IRQ 3 Z & 3 | | 5 | |___________________________________________| | | | | | default setting is IRQ4 | | IRQ 4 Z & 4 | | and [ ] indicates two | |___________________________________________| | points are connected by | | | | the jumper | | IRQ 5 Z & 5 | |_________________________| |___________________________________________| 7 1.3.4 An Example of JUMPER Setting The following Jumper setting for COM3 and COM4 is based on BitCom communications software. _________________________________________________________________ | | | COM PORT JUMPER X JUMPER Y JUMPER Z INT | |_________________________________________________________________| | | | COM1 X and 1 Y and 3 Z and 4 IRQ4 | |_________________________________________________________________| | | | COM2 X and 2 Y and 3 Z and 3 IRQ3 | |_________________________________________________________________| | | | COM3 X and 1 Y and 4 Z and 4 IRQ4 | |_________________________________________________________________| | | | COM4 X and 2 Y and 4 Z and 3 IRQ3 | |_________________________________________________________________| 1.3.5 Installation - Turn off the computer power switch and remove the power cord. - Remove the computer system unit cover. - Choose one of the available expansion slots and remove the slot cover on the rear panel of the computer. Save the screw. - Carefully slide the HOOK-UP 2400 into the slot. Fasten the retaining bracket with the screw. - Replace the cover on the computer system unit. - Connect the upper jack (LINE) to the telephone line, and the lower jack (PHONE) to an optional external telephone handset. 8 1.4 Installation Testing - Disconnect phone jacks from the HOOK-UP 2400. - Check computer system is booted up and runing properly. - Execute the communications software. Refer your software manual. - Verify the communication software is configured to talk to the port selected. Refer to the communications software manual for more information. - Get into the dumb terminal mode to communicate to the modem. Refer to section 4.1 of this manual. a) Type " ATZ " <CR> ; Reset all modem defaults " OK " ; Modem acknowledgment If you do not get a " OK " response from the HOOK-UP 2400 then go back to step #4 and make sure your jumper setting is correct. The most common error is that more than one piece of hardware is assigned to the same COM port address or the software is not configured to the same port that is set on your HOOK-UP 2400. b) Type " ATS18 = 5&T8 " <CR> ; Request analog loop test to ; run 5 seconds " 000 " ; No error response " OK " ; Modem acknowledgment c) Connect phone jacks again then type " ATH1 " <CR> ; Go off-hook You should hear dialtone sound from the speaker. If not, check your telephone line. d) Using a small flat screw driver, adjust the volume on the modem's volume control port, located on the retaining bracket. e) Now, your HOOK-UP 2400 is ready to serve. 9 CHAPTER 2: MODEM OPERATION ___________________________ This documentation provides information for you to operate the HOOK- UP 2400 using the built-in AT commands and modem S-Registers. The Hook-Up 2400 is always in one of two states, command state or on-line state. When power is on Hook-Up 2400 assumes the command state. This state allows the user to configure the modem for the particular application in which the modem will be functioning. Also, the user may issue a command which will cause the modem to enter the on-line state (i.e, auto dial or auto answer). Once the Hook-Up 2400 is in the on-line state all information over the communication line is treated as data, not commands or result codes. To return the modem to the command state, the escape code (discussed under "AT" command set description) must be entered. 2.1 Command Guidelines Attention Code All commands must be at 300, 1200 or 2400 bps asynchronous. Command lines must begin with the characters AT. The transmission speed, word length, and parity are determined from the AT. A/ Command The A/ command instructs the Hook-Up 2400 to repeat the last command line stored in a command buffer. It may be used to redial the previous telephone number when a busy signal is encountered. A/ is used in place of AT and no carriage return (CR) is required. Each command remains in the command buffer until AT is entered or power to the modem is turned off. Both actions clear the buffer and make the A/ command invalid since there is no command for it to repeat. 10 Backspace Key Prior to pressing CR, editing can be done with the backspace key; it deletes the last character in the command buffer screen. The backspace key will not delete the AT at the beginning of the command line. Carriage Return The command line must be ended with a carriage return. The Hook-Up 2400 will not begin to execute the command until it receives a carriage return. Missing Parameter A missing parameter evaluates to the default value. For example, the H command can have a parameter of zero (HO). Since 0 is the default value, H alone is the same as HO. Command Buffer The command buffer capacity is 40 characters. If the command line exceeds 40 characters, the Hook-Up 2400 will refuse to execute any portion of the command line and send an error massage. Command Data Rate Commands to the Hook-Up 2400 in the local command state must be asynchronous, ASCII coded and transmitted at rates of 300, 1200 or 2400 bps only. Unimplemented AT Commands If an unimplemented command is executed, no action will be taken by the modem and the OK or ERROR result code will be given. 11 2.2 Result Codes Result codes are responses by the Hook-Up 2400 to commands. A command line, followed by a carriage return, causes the modem to execute the command. When the command has been completed, the modem sends a result code. Result codes may be English words or single digits (0-5). Word codes are preceded and followed by a carriage return/line feed sequence. Digit codes are only followed by a carriage return. The result codes and their meanings are summarized in following Table. RESULT CODES ____________ Digit Word Code Code Meaning ------------------------------------------------------------------- O OK Command executed without errors. 1 CONNECT Connection is established; 300 bps or 1200 bps if X0 is set 2 RING Local ringing signal detected; will answer only if auto answer enabled 3 NO CARRIER Carrier lost or never present. 4 ERROR Error in the command line. 5 CONNECT 1200 Connection established at 1200 bps; if X1 is set 6 NO DIALTONE No dial tone detected; if X2 or X4 is set 7 BUSY Line is busy; X3 or X4 is set 8 NO ANSWER No answer; if "@" dial modifier used 10 CONNECT 2400 Connection established at 2400 bps; if X1 or X4 is set 12 2.3 Transmission Speed Transmission speed is governed by the speed of the system connected to the Hook-Up 2400. You must set the transmission rate of the computer or terminal which will be used with the modem to 2400 bps, 1200 bps or 300 bps. When the modem originates a call, it automatically detects and adjusts to the transmission speed set in your equipment. The modem uses the AT command to determine bps, word length, and parity of the device to which it is connected. When the modem answers a call, it determines the transmission speed from the carrier signal of the originating modem. 13 2.4 HOOK-UP 2400 "AT" COMMAND DEFINITIONS A Go off hook and answer phone immediately The HOOK-UP 2400 immediately goes off hook, transmits the answer tone and waits for a carrier from the remote modem. Commands entered after the A command are ignored. A/ Repeat previous command The last command executed by the HOOK-UP 2400 will execute again. This command does not require the "AT" prefix or <cr> termination. Bn Bell/CCITT mode select B0 - Selects CCITT V.22 operation at 1200 bps B1 - Selects BELL 212A operation at 1200 bps (Default) Most 1200 bps modems in the United States operate using the BELL 212A specification. In order to communicate with a modem conforming to the international CCITT V.22 standard, issue the B0 command before dialing. Dn Dial the number immediately following this command where n = digits 0 to 9 together with the dial modifiers listed below. The HOOK-UP 2400 will dial the number specified in the manner determined by the dial modifiers. The dial modifiers may appear anywhere within the dial string with the exception of the ; modifier which must appear at the end of the string. Dial Modifiers: P Pulse dial T Tone dial R Originate call in answer mode W Wait for dial tone before dialing , Pause before dialing next digit ; Return to command mode after dialing @ Wait for quiet answer before dialing ! Flash-hook. S Dial the number stored in RAM 14 Example: ATDP9WT713,S; In this example, the HOOK-UP 2400 pulse dials a 9 digit, waits for a dial tone, then tone dials the digits 713. Next, the modem pauses the length of time specified in register S8. It then dials the number stored in the HOOK-UP 2400 controller's RAM which can be up to 32 digits in length. Finally, the modem returns to the command mode after the final digit has been dialed. The P modifier causes the modem to pulse or rotary dial at a fixed rate of 10 pulses per second. (The make/break ratio for pulse dialing is determined by the &P command.) The T modifier causes the modem to dial using DTMF (Dual-tone multi-frequency) signals, the same as those used by "touch-tone" telephones. The R modifier is used to call modems which can communicate only using the originate mode carrier frequencies. This is a limitation generally found only in older modems. The W modifier causes the HOOK-UP 2400 to wait for a dial tone signal for the number of seconds specified in register S7. This is generally used when trying to dial through a PBX or when using a long distance service such as SPRINT or MCI. The @ modifier causes the HOOK-UP 2400 to wait for the time specified by register S7 for one or more rings followed by 5 seconds of silence before processing the next symbol in the dial string. It is used to access a system that does not provide a dial tone. The ! modifier causes the modem to go on-hook for 1/2 second. This is equivalent to holding the switch-hook button on your telephone down for 1/2 second. The flash is generally used for transferring calls. The S modifier allows the HOOK-UP 2400 to dial a number which has been previously stored in RAM using the &Z command. The maximum size number allowed is 32 digits. The S command does not save the number in non-volatile memory. The number will be lost when power is cycled or after issuing an ATZ command. En Echo back characters in command mode E0 - no characters echoed back to host in command mode E1 - echoes back characters to host typed in command mode (default) This command controls the echoing back of commands to the host computer or terminal. In most personal computer applications, the default E1 is used so that the user can see what he has just typed in. When running in half-duplex mode, the E0 command should be used to avoid having 2 copies of each character displayed on the screen. 15 Hn Activate switch-hook H0 - go on hook (hang-up) (default) H1 - go off hook (pick up the phone) This command forces the modem to pick-up or hang-up the phone in the same way a telephone handset is picked-up to answer a call or placed back on the switch-hook to terminate a call. H0 may be used to terminate a call after issuing +++ to return to the command state. Use of the H1 command is generally not required as the modem will automatically answer an incoming call if the S0 register is a non-zero value. In Request product code and ROM checksum I0 - display product code I1 - display ROM checksum I2 - display ROM checksum as OK or ERROR This command is used as a diagnostic tool when troubleshooting the modem. Mn Speaker on/off commands M0 - speaker always off M1 - speaker on until carrier detected (default) M2 - speaker always on M3 - disables speaker while dialing and when receiving carrier from remote modem The M commands are used to control a monitor speaker. M0 will turn the speaker off at all times. M1 is the default condition which allows the user to hear dial, ring and connection. The M2 command causes the speaker to stay on at all times, which may be useful in debugging a transmission problem. M3 allows the user to monitor just the ring and connection process. 16 On Place modem in the on-line data mode O0 - HOOK-UP 2400 returns to on-line state O1 - HOOK-UP 2400 returns to on-line state and initiates an equalizer retrain sequence When connected to another modem, it may be necessary to go back into command mode (using +++) to enter some command to the modem. After completion of the commands, an ATO or ATO1 command will return the HOOK-UP 2400 to the on-line condition. Qn Enable/disable result codes (Quiet mode) Q0 - Result codes sent (default) Q1 - No result codes sent The Q commands are used to enable or disable the sending of result codes (such as OK, CONNECT 2400, ERROR, etc.) to the host computer or terminal. In the Q0 default mode, result codes will be returned to the computer. In Q1 mode, no result codes are sent. Sn? Read value stored in register Sn where n = 0...27 and specifies the register to be read. This command causes the HOOK-UP 2400 to read the value stored in one of the S registers and display it on the screen as a decimal number. Sn=r Store the value r in register Sn where n = 0...27 and specifies the register to which the value r is assigned, and r = 0...255 and is the value to be stored in register Sn. This command stores the value r in register Sn. 17 Vn Sets result code format V0 - selects short-form numeric result codes V1 - selects long-form verbal result codes (default) Xn Select extended result code set where n = 0,1,2,3,or 4 with the default being 4. By using the X commands, the user can enable and disable the following HOOK-UP 2400 functions: NO DIALTONE detect, BUSY detect, BLIND DIAL capability, and send only the CONNECT message after connecting. The table below specifies which functions are enabled depending on which X command was last entered. Function X0 X1 X2 X3 X4 ------------------------------------------------------------------ BUSY detect No No No Yes Yes NO DIALTONE detect No No Yes No Yes CONNECT message only Yes No No No No BLIND DIAL enabled Yes Yes No Yes No Sending only the CONNECT message complies with Hayes SMARTMODEM 300 compatibility. When X1 through X4 are selected, the full range of connect messages are displayed (CONNECT 2400 = 2400 bps connection, CONNECT 1200 = 1200 bps connection, and CONNECT = 300 bps connection.) All connect messages are sent at the data terminal's autobaud rate, while all subsequent data is sent at the connect data rate. When blind dialing, the modem will dial regardless of the presence or absence of a dial tone. The modem will wait the number of seconds determined by register S6 which has a default of 2 seconds. The BUSY message, when enabled, informs the user that a busy signal was encountered during the dial process. Z Reset the HOOK-UP 2400 This command resets the modem to its default values and clears the register used to store the number recalled by the "ATDS" command. 18 &Cn Data-Carrier-Detect (DCD) control &C0 - DCD always on &C1 - DCD follows state of data carrier (default) When n = 0, the DCD line will remain in the ON condition regardless of the state of the data carrier coming from the remote modem. When n = 1 (default), DCD will follow the state of the data carrier coming from the remote modem. When a data carrier is detected coming from the remote modem, DCD is on, otherwise DCD is off. &Dn Data-Terminal Ready (DTR) control &D0 - HOOK-UP 2400 ignores DTR. &D1 - The HOOK-UP 2400 goes into command mode if an ON to OFF transition is detected on DTR. &D2 - The HOOK-UP 2400 goes on-hook, disables auto-answer, goes into command mode after detecting an ON to OFF transition on DTR. If DTR goes back on, auto-answer is re-enabled. &D3 - An ON to OFF transition on DTR causes the modem to go through an initialization sequence. Default values for all commands and S registers are re-instated. The modem will ignore any DTR transition that lasts for less than the value contained in register S25. The factory setting is 5/100 of a second. &F Restore default configuration The &F command restores the factory default values to all S registers. In the HOOK-UP 2400, the Z command and &F command are equivalent since there is no non volatile memory storage. &P Pulse dial make/break ratio select &P0 - U.S. setting , 39% make/61% break (default) &P1 - UK/Hong Kong setting, 33% make/67% break This command determines the ratio of off-hook (make) to on-hook (break) intervals when pulse dialing. 19 &Tn Test and Diagnostic commands &T0 - Terminate any test in progress &T1 - Initiate local analog loop back test &T8 - Initiate local analog loop back with self test When n = 0, any test in progress will be terminated. This may only be the last command in a command line. When n = 1, a local analog loopback test conforming to CCITT recommendation V.54, L3 is initiated. When n = 8, a local analog loopback self-test is initiated conforming to CCITT recommendation V.54,L3. When n = 2 - 7, and ERROR message is returned. The HOOK-UP 2400 does not support remote or local digital loopback testing. &Zn Store telephone number n in RAM The &Z command will store a number with a maximum length of 32 digits into a RAM register of the HOOK-UP 2400 controller. The number can be recalled for use by the "ATDS" command. The number can be any legal dial modifier or tone and pulse digits ranging from 0 to 9. The dial string must not exceed 32 digits. 20 2.5 HOOK-UP 2400 S-Register Definitions S0 Ring to answer/on The value stored in register S0 determines how many incoming rings are required before the HOOK-UP 2400 will go off-hook and answer the phone. A value of 1 to 255 enables auto answer mode, and a value of 0 will disable auto answer mode. S1 Ring Count S1 is incremented each time the modem detects an incoming ring signal. This register is cleared if no rings occur over an 8 second interval. S2 Escape Code Character The value stored in this register determines the ASCII character which will cause the modem to escape from on-line data mode back to command mode. A string of 3 escape characters followed by a carriage return is required to cause an escape. The default value stored in this register is 43 which corresponds to an ASCII +. S2 can be set to any value of from 0 to 255. Values greater than 127 will disable escape code detection. When the escape code is disabled, hang-up can be achieved if the remote modem drops carrier or if an on-to-off transition is detected on DTR by the HOOK-UP 2400 when &D1, &D2, or &D3 are in effect. S3 Carriage Return Character S3 holds the ASCII value of the carriage return character. The default value is 13. S4 Line Feed Character S4 holds the ASCII value of the line feed character. The default value is 10. 21 S5 Back Space Character S5 holds the ASCII value of the back space character. The default value is 8. The backspace character must not be set to a value corresponding to a printable ASCII character (between 33 and 126) or to a value of 127 or greater. If it is, the HOOK-UP 2400 will ignore it. S6 Wait For Dial Tone The value in S6 determines how many seconds the HOOK-UP 2400 will wait after going off-hook before dialing the first digit. The delay is used to allow the central office time to detect the off-hook condition and send a dial tone. The default is 2 seconds. S7 Wait-time for Carrier before abort The value stored in S7 determines how many seconds the HOOK-UP 2400 will wait to see a carrier signal after it has gone off-hook. The default value is 30 seconds. S7 may be programmed from 1 to 255 seconds. S8 Pause Time for Comma Register S8 determines the duration of the dialing pause caused by detecting a , dial modifier in the dial string. The comma is usually used to wait for a second dial tone when dialing through a PBX. The default value is 2 seconds. Values from 0 to 255 are accepted. S9 Carrier Detect Response Time The value stored in this register determines the length of time an incoming data carrier must be present before the HOOK-UP 2400 will recognize it and turn on DCD. The default value is 6(tenths of a second). Increasing this value will decrease the chance of detecting a false carrier such as noise or a busy signal. 22 S10 Carrier Loss to Hang up Delay Register S10 establishes the delay between the detection of a loss of data carrier from the remote modem and the time when the HOOK-UP 2400 will disconnect. The default value is 14(tenths of a second). Setting S10 to 255 causes the HOOK-UP 2400 to ignore the carrier detect status and function as though a carrier were always present. If S10 is set to a value smaller than the S9 carrier detect response time, any loss of carrier results in a disconnect, since the HOOK-UP 2400 times out before the carrier detect response delay expires. The actual length of a momentary loss that can be tolerated is the difference between S10 and S9. S11 DTMF Digit Duration Register S11 holds the value which determines the length of duration for each DTMF digit in milliseconds and the silence interval between adjacent digits. The default is 95 msec (same as Hayes) and can be programmed from 50 to 255 msecs. S12 Escape Code Guard Time In the HOOK-UP 2400, the escape code guard time is defined as the time delay between the last character of the escape code (+++) and the next data character transmitted by the host DTE. The default value is fixed at 1 second. S13 Reserved S14 Bit Mapped Options Bit 0 Reserved Bit 1 Command echo 0 - No echo (See E command) 1 - Echo (default) Bit 2 Result Codes 0 - Enabled (default) (See Q command) 1 - Disabled Bit 3 Verbose mode 0 - Short form numeric result codes (See V command) 1 - Full word result codes (default) 23 Bit 4 Reserved Bit 5 Dial method 0 - Tone dial (See T and P 1 - Pulse dial (default) commands) Bit 6 Reserved Bit 7 Originate/Answer 0 - Answer (See A, D, and 1 - Originate (default) R command and register S0) S15 Reserved S16 Modem Test Options Bit 0 Local Analog 0 - Disabled (default) Loopback 1 - Enabled (See &T1) Bit 1 Reserved Bit 2 Reserved Bit 3 Reserved Bit 4 Reserved Bit 5 Reserved Bit 6 Local Analog 0 - Disabled (default) loopback L3 1 - Enabled with self test. (See &T8) Bit 7 Reserved S17 Reserved S18 Test Timer Establishes the duration of the HOOK-UP 2400 diagnostic routines. When a test has been active for a period of time equal to the value stored in register S18, the HOOK-UP 2400 will automatically cancel the test. Setting S18 to 0 disables the test timer (default). A test can be terminated from command mode at any time by issuing the &T0 command. 24 S19 Reserved S20 Reserved S21 Bit Mapped Options Bit 0 Reserved Bit 1 Reserved Bit 2 Reserved Bit 3,4 Data Terminal Ready - DTR (See &D command) 0 - Modem ignores DTR (default) 1 - Modem goes to command mode if On to Off transition occurs on DTR. 2 - Modem "hangs up" if On to Off transition on DTR. 3 - Modem goes to the initialization state if On to Off transition on DTR. Bit 5 Data Carrier Detect - DCD (See &C command) 0 - DCD always on 1 - An ON condition on DCD indicates the presence of a valid data carrier (default). Bit 6 Reserved Bit 7 Reserved S22 Bit Mapped Options Bit 0 Reserved Bit 1 Reserved Bit 2,3 Speaker Control 0 - Speaker Disabled (See M command) 1 - Speaker on until carrier (default) 2 - Speaker always on 3 - Speaker on until carrier detected but off during dialing 25 Bit 4,5,6 Result Code Options (see X command) 0 - Selects Hayes Smartmodem 2400 result codes; when the modem receives the dial command, it goes off-hook, waits the number of seconds given by register S6, and "blind dials" (does not look for dial tone). 4 - The HOOK-UP 2400 selects the appropriate connect result code from the following list: CONNECT, CONNECT 1200, OR CONNECT 2400. Upon receiving the dial command, the HOOK-UP 2400 goes off-hook, waits the number of seconds given by register S6, and "blind dials" (does not look for dial tone). 5 - Same as 4, but the HOOK-UP 2400 waits for dial tone before dialing. 6 - Same as 4 but the HOOK-UP 2400 detects busy signal and sends BUSY result code. The modem blind dials. 7 - Same as 6 but the HOOK-UP 2400 waits for dial tone before dialing. All result codes are enabled (default). S23 Bit Mapped Options Bit 0 Reserved Bit 1,2 Communications rate (See AT command) 0 - 0 to 300 bps 1 - Reserved 2 - 1200 bps 3 - 2400 bps (default) Bit 3-7 Reserved S24 Reserved S25 Detect DTR change A change in the state (On to Off) of the Data Terminal Ready line which persists for less than the value contained in register S25 is ignored by the HOOK-UP 2400. Values for S25 range from 0 to 255 hundredths of a second, with the default being 5/100 of a second.) S26 Reserved 26 S27 Bit Mapped Options Bits 0-5,7 Reserved Bit 6 Bell vs CCITT 0 - CCITT V.22 at 1200 bps (See B command) 1 - BELL 212A at 1200 bps (default) 27 Chapter 3: AT command applications ___________________________________ 3.1 Dialing In response to the dial command, the Hook-Up originates a telephone call. No other device is required for automatic dialing. Command: ATD1234567 <CR>; Dial 1234567 In response to this command, the modem dials the telephone number "123- 4567" and then waits for carrier from a distant modem. If no carrier is detected within a given time (the default time is 30 seconds), the modem automatically releases the line and sends a NO CARRIER result code. If carrier is detected, the modem gives a CONNECT result code and goes on- line, permitting communication with the distant modem. Command: ATD9,1234567 <CR>; Dial 9, pause, dial 1234567 When placing a call from an office with a telephone connected to a PBX, it is necessary to dial an access code (usually the digit 9) to get an outside line. You can command the modem to pause and wait for the second dial tone by inserting a comma in the telephone number. The default pause time is 2 seconds. Multiple commas may be used for a greater delay time. Command: AT DP9,T1234567 <CR>; Pulse dial 9, pause, touch-tone ; dial 1234567 The modem is capable of using DTMF (touch-tones) or dial pulses when dialing a telephone number. If the dial command does not specify which type to use, the modem defaults to the type last specified. The power-on default value is T. The T and P commands determine the dialing type. They can be inserted into the telephone number at any point, allowing the dialing type to be changed during the dialing operation. 28 Command: ATD1234567R <CR>; Dial number in answer mode The D command forces the modem into originate mode. To call someone with an originate-only modem, dial the number and set the modem to answer mode (even though you are originating the call) via the R command. Enter the R (reverse) command at the end of the telephone number. Command: ATDT9, 1234567; <CR> ; Touch-tone dial 9, pause, dial number, ; return for command ATH ; Hang up Ending the dial command with a carriage return causes the modem to wait for carrier. Terminate the process by pressing any key. The modem can be forced to re-enter the command state after dialing (without hanging up) by ending the dial command with a semicolon. This is useful when using the modem as an auto dialer. Listen for a telephone ringing over the built-in speaker. When it is heard, pick up the telephone handset, and issue the hang up command to the modem. You may then talk to a person on the telephone. Another autodial command sequence is to dial normally without the semicolon, wait for the ringing signal, pick up the telephone, and press any key to cause the modem to hang up. Command: ATDP9 WT 1234567;E0 <CR>; Combine Pulse and Touch tone ; dialing and then execute E0 This example combines Pulse and Touch tone dialing. The W modifier insures that no action will be taken by the modem until it has acknowledged connection to an outside line after pulse dialing 9. Once dialing is complete, the modem returns to command mode and executes E0 command which tells the modem that from now on, characters sent to it in Command mode are not be echoed to the screen. The W modifier is necessary for subscribers of some discount phone service when the modem must wait for a second dial tone before transmitting the rest of the number. Command: ATDT 1234567 @ 12345 <CR>; Wait for silence The @ modifier is used on systems that do not provide a dial tone. In this example the modem dials the first number and waits for 5 seconds of silence before continuing. The modem will only continue if it detects 5 seconds of silence within the time specified by the value in S7. 29 A security system might require the entering of certain tones to inhibit unauthorized entry. Command: ATD1, 234567 ! 123 <CR>; Flash Modem dials 1, pauses, dials the remainder of the number, initiates a flash which is equivalent to hanging up the phone for 1/2 second, and dials the extension 123. A flash is used on some systems to transfer a call. 3.2 S-Registers Programming Command: ATSn? <CR>; Reading from the Sn Register To read the current value of a register, use the command Sr? where "r" is the number of the register. The decimal value of the register contents is then displayed. For example, if you wish to read the current value in registers S0 (ring to answer on) and S7 (wait time for carrier), perform the following. Enter: AT S0? S7? (Value in register SO? Value in register S7?) A typical response to this might be: Result: 001 (Hook-Up will answer on first ring) Result: 030 (Hook-Up will wait 30 seconds for a carrier) Result: OK (OK read command completed) Command: ATSn = x <CR>; Write x into the Sn Register To set or change a parameter, use the command Sr=n where "r" is the num- ber of the register and "n"is a value between 0 and 255 (i.e., the range of values that can be assigned to registers S0-S16). 30 In the previous example, "Reading a Register," the value in the S0 register was set so that the modem would answer the call on the first ring. If you want the modem to answer on the fifth ring: Enter: AT S0 = 5 (Auto answer on ring 5) Result: OK To signal that the command has been executed, the modem sends the result code OK. The S command can be used without the ? or =. The S command actually sets a pointer to the address of the register specified. The ? and = are separate commands that either read data from or put date in the address specified by the pointer. To illustrate this, Enter: AT S7 (Register S7) Press: RETURN A pointer is set to the address of the seventh register. So long as no other S command is entered, you can request the value of that register at any time without specifying the number. Enter: AT? (Value in register S7?) In response, the modem displays the current value in the S7 register. Similarly, if you Enter: AT = 10 The modem will change the value in the S7 register to 10. 3.3 Answering You can set the modem to automatically answer the phone, or you can use the " A " command to manually answer an incoming call. S0 determines whether the modem will answer automatically or not. The S0 register controls the number of rings, if any that must occur before the modem answers a call. The register may range in value from 0-255. SO=0 DO NOT ANSWER TELEPHONE SO=1 ANSWER ON RING 1 SO=2 ANSWER ON RING 2 SO=3 ANSWER ON RING 3 . . . 31 SO=255 ANSWER ON RING 255 When SO is set to 0, the auto-answer option is not in effect. Example: Assign the value "6" to SO to set the modem to answer on the sixth ring. Enter: AT S0 = 6 Result: OK 3.4 Moving from On-Line to Command Mode Use the following procedure to move to the command mode from the on-line mode. - Pause for the time guard to elapse. - Enter the following quickly ( do not allow more than the time guard to elapse between each character). " +++ " - Do not prefix the three pulses with any characters. Also, do not press the <CR> key to end the line. - The HOOK-UP 2400 is now in the command mode. 3.5 Moving from Command mode to On-Line mode The following procedure assumes that the HOOK-UP 2400 is in the command mode. - Enter the following command line: " ATO " <CR> - Press return key. - HOOK-UP 2400 is now on-line mode. 32 3.6 Changing Between Voice and Data You can change operation between voice and data communication without breaking the connection to another system. To change from voice to data, use the following procedure. 3.6.1 Switching from data to voice - Pick up the phone handset. - Type a message requesting the other person to pick up the phone. - After the other person pick up the phone, type " +++ " and wait for " OK " response from the HOOK-UP 2400. - Type " ATH " and wait for " OK " message. - You are now ready to talk to the remote operator. 3.6.2 Switching from voice to data - Request the other person to type " ATA " to put the HOOK-UP 2400 in answering mode. - Listen for a high pitch tone and then type " ATD " to put the HOOK-UP 2400 in originate mode. - Both operator hang up their phone handsets. 33 Chapter 4: Troubleshooting ___________________________ This chapter describes some of the common problems you might have in the installation, configuration, or regular usage of the modem. In order to test the modem you need to use your communication software in the ON-LINE mode, or as you may see in other software manuals, in terminal mode or standard mode. In this mode your keyboard acts as a dumb terminal's keyboard taking to the modem. 4.1 Dumb terminal mode ( direct communication mode ) To get into dumb terminal mode using BITCOM 3 communications software, use the following procedure. - From the BITCOM main menu, type " 3 " - Look for Comm port field in the communications configuration menu. - Use down arrow to move cursor to Com port, use left/right arrow to change this field to match with the modem Com port set up. - Press " F2 " to return to the main menu. - Type " 1 " to return to the communications selection menu. - Move the cursor to the line that says " dumb terminal local connect ". Press return. Now you are in direct communication (dumb terminal mode) with the HOOK-UP 2400. 34 4.2 Local Analog Loop Back Test. This feature tests your computer and modem for proper operation locally. This option do not test your phone line interface. Before entering analog loopback test, the telephone line must be removed from the modem. Normal telephone line signals may disrupt the performance of the modem during analog loopback. - Type " AT&T1 " and press return. - Type in your test message; everything you typed will be echoed back from the modem to the screen. If the message echoed back correctly, the modem and computer are operating correctly. - To terminate this test, type " +++ " ( no return ) and then wait " OK " message. After receive message from the modem, type " AT&T0 " <CR>. 4.3 Local Analog Loop Back Test with Self Test. This features is similar to local analog loop back test, except that the modem will generate its own test pattern, analyze the receive data and report the error count. - Type " AT&T8 " <CR> - Wait 1 minute or more. - Type " AT&T0 " to terminate test. - HOOK-UP 2400 will display error count. If the massage is " 000 ", the modem and computer are operating correctly. The " ATS18=60&T8 " command give you same result (1 minute testing). 35 4.4 Make sure your computer recognize the HOOK-UP 2400. To check this you should type: ATZ <CR> Depending on your communication software you may get a "O" or an "OK" in response. - If you do not see the "ATZ", but you get the"O" or "OK" on the screen, this is normal and the reason is that your software has initialized the modem using EO command (not echoing the command characters). - If you don't get the result code for your "ATZ" command you have to check the configuration of your modem. In this case you may check the following points: If your computer has a serial port on the mother board (usually com1) and supports only COM1 and COM2, then you can't have any other add-on serial port other than the modem, and the modem should be configured for com2. If you have a multifunction card with two serial ports make sure that one of them is disabled and one that stays enabled is in a different COM port than the modem. - If all the above items are set correctly and you still don't get a result code check the baud rate of your software and make sure it is either 300, 1200 or 2400 bps 36 4.5 The Modem does not dial Make sure that you can communicate to your modem as described above. Once you made sure of that check the followings: - Make sure that your modem is hooked up to a live phone line, and the volume is not very low. - Make sure that your software configured for either 300, 1200 or 2400 baud rate. 4.6 The Modem dials the number but doesn't connect This problem might be caused by any of the following: - The remote station may not recognize your baud rate. - The carrier wait count (S7) might be to short; default setting is 30 seconds, often it is too short for long distant connect. - You may have a noisy phone line. - Check your phone cord using a regular telephone set. 4.7 The modem connects to the remote station but you can't sign-in You should check the communication parameters of the remote station and make sure your software is configured for the same number of data bits, start bit, stop bit, and parity. 37 APPENDIX A: HOOK-UP 2400 "AT" Command Summary ______________________________________________ COMMAND DESCRIPTION ------- --------------------------------------------------- AT COMMAND LINE PREFIX (ATTENTION CODE); PRECEDES COMMAND LINES EXCEPT +++ (ESCAPE) AND A/ (REPEAT) COMMANDS. A/ RE-EXECUTE LAST COMMAND LINE; (A/ IS NOT FOLLOWED BY A CARRIAGE RETURN). A OFF-HOOK IN ANSWER MODE B SELECTS CCITT V.22 OPERATION WHEN COMMUNICATING AT 1200 BPS. B1 (Default) SELECTS BELL 212A OPERATION WHEN COMMUNICATING AT 1200 BPS. D DIAL NUMBER WHICH FOLLOWS D IN THE COMMAND LINE. E MODEM DOES NOT "ECHO" COMMANDS BACK TO TERMINAL E1 (Default) MODEM ECHOS COMMANDS BACK TO TERMINAL. H (Default) ON-HOOK (HANG-UP) COMMAND. H1 GO OFF-HOOK I REQUEST PRODUCT IDENTIFICATION CODE. I1 PERFORMS CHECKSUM ON FIRMWARE ROM;RETURNS CHECKSUM I2 PERFORMS CHECKSUM ON FIRMWARE ROM; RETURNS OK OR ERROR. M SPEAKER OFF M1 (Default) SPEAKER ON UNTIL CARRIER DETECTED M2 SPEAKER ALWAYS ON M3 SPEAKER ON UNTIL CARRIER DETECTED EXCEPT DURING DIALING. O RETURN TO ON-LINE STATE. O1 RETURN TO ON-LINE STATE AND INITIATE RETRAIN Q (Default) MODEM RETURNS RESULT CODES. Q1 MODEM DOES NOT RETURN RESULT CODES. SR=N SET REGISTER R TO VALUE N. SR? REQUEST CONTENTS OF REGISTER R. V SHORT FORM NUMERIC RESULT CODES. V1 (Default) FULL WORD RESULT CODES. 38 COMMAND DESCRIPTION ------- --------------------------------------------------- X 300 BPS COMPATIBILITY MODE; CONNECT RESULT CODE ENABLED. X1 MODEM BLIND DIALS; ALL CONNECT XXXX RESULT CODES ENABLED; BUSY SIGNAL NOT DETECTED. X2 MODEM WAITS FOR DIAL TONE BEFORE DIALING; ALL CONNECT XXXX RESULT CODES ENABLED; MODEM SENDS BUSY RESULT CODE IF BUSY DETECTED. X3 MODEM BLIND DIALS; ALL CONNECT XXXX RESULT CODES ENABLED; MODEM SENDS BUSY CODE IF BUSY DETECTED. X4 (Default) MODEM WAITS FOR DIAL TONE BEFORE DIALING; ALL CONNECT XXXX RESULT CODES ENABLED; BUSY SIGNAL NOT DETECTED. Z LOAD STORED CONFIGURATION PROFILE. &C DCD ALWAYS ON. &C1 (Default) DCD ON INDICATES PRESENCE OF DATA CARRIER. &D (Default) MODEM IGNORES DTR. &D1 MODEM ASSUMES COMMAND STATE WHEN ON-TO-OFF TRANSITION DETECTED ON DTR. &D2 MODEM HANGS UP & ASSUMES COMMAND STATE. AUTO ANSWER NOT DISABLED UNLESS EXTERNALLY IMPLEMENTED BY (RI- * DTR-)= A6-. &D3 MODEM ASSUMES INITIALIZATION STATE UPON DETECTING AN ON-TO-OFF TRANSITION ON DTR. &F LOAD FACTORY CONFIGURATION PROFILE. &P (Default) PULSE DIAL MAKE/BREAK RATIO=39/61 (USA) &P1 PULSE DIAL MAKE/BREAK RATIO = 33/67 (UK/HK) &S DSR ALWAYS ON. &S1 DSR OPERATES IN ACCORDANCE WITH EIA RS-232C SPEC &T TERMINATE TEST IN PROGRESS. &T1 INITIATE LOCAL ANALOG LOOPBACK TEST. &T8 INITIATE LOCAL ANALOG LOOPBACK WITH SELF TEST. &Z STORE TELEPHONE NUMBER. DIAL MODIFIERS -------------- P PULSE DIAL T TONE DIAL , PAUSE ! FLASH @ WAIT FOR SILENCE W WAIT FOR SECOND DIAL TONE ; RETURN TO COMMAND STATE AFTER DIALING R ORIGINATE CALL IN ANSWER MODE S DIAL STORED NUMBER 39 APPENDIX B: HOOK-UP 2400 S-REGISTER SUMMARY ____________________________________________ REGISTER RANGE UNITS FACTORY SETTING DESCRIPTION ------------------------------------------------------------------------- S0 0-255 RINGS RING TO ANSWER ON S1 0-255 RINGS 00 RING COUNT S2 0-127 ASCII 43 ESCAPE CODE CHARACTER S3 0-127 ASCII 13 CARRIAGE RETURN CHARACTER S4 0-127 ASCII 10 LINE FEED CHARACTER S5 0-127 ASCII 08 BACK SPACE CHARACTER S6 0-255 SEC 02 WAIT FOR DIALTONE S7 1-255 SEC 30 WAIT FOR DATA CARRIER S8 0-255 SEC 02 PAUSE TIME FOR COMMA S9 1-255 1/10 SEC 06 CARRIER DETECT RESPONSE TIME S10 1-255 1/10 SEC 14 LOST CARRIER TO HANG-UP DELAY S11 50-255 MSEC 95 DTMF DIGIT DURATION S12 FIXED 1/50 SEC 50 ESCAPE CODE GUARD TIME S13 NONE NONE 00 RESERVED S14 NONE FLAGS 170 BIT MAPPED OPTIONS S15 NONE NONE 00 RESERVED S16 NONE FLAGS 00 MODEM TEST OPTIONS S17 NONE NONE 00 RESERVED S18 0-255 SEC 00 TEST TIMER S19 NONE NONE 00 RESERVED S20 NONE NONE 00 RESERVED S21 NONE FLAGS 32 BIT MAPPED OPTIONS S22 NONE FLAGS 118 BIT MAPPED OPTIONS S23 NONE FLAGS 06 BIT MAPPED OPTIONS S24 NONE NONE 00 RESERVED S25 0-255 1/100 SEC 05 DETECT DTR CHANGE S26 NONE NONE 01 RESERVED S27 NONE FLAGS 64 BIT MAPPED OPTIONS 40 APPENDIX C: HOOK-UP 2400 POWER-UP CONFIGURATION ________________________________________________ SPEED = 2400 BPS BELL 212A OPERATION AT 1200 BPS AUTO ANSWER DISABLED COMMAND ECHO ON ALL RESULT CODES ENABLED WAIT FOR DIAL TONE BEFORE DIALING DETECTS BUSY SIGNAL FULL WORD RESULT CODES PULSE DIAL MAKE/BREAK RATIO = 39/61 TEST TIMER SET TO 0 SECONDS DCD FOLLOWS CARRIER SIGNAL MODEM IGNORES DTR CTS ALWAYS ON, RTS IGNORED DSR ALWAYS ON SPEAKER ENABLED BUT OFF WHEN RECEIVING CARRIER RING COUNT = 00 ESCAPE CODE CHAR. = 43 CARRIAGE RETURN CHAR. = 13 LINE FEED CHAR. = 10 BACK SPACE CHAR. = 08 DURATION OF WAIT FOR DIAL TONE = 02 SECS DURATION OF WAIT FOR CARRIER AFTER DIALING = 30 SECS DURATION OF DIAL PAUSE (COMMA) = 02 SECS ESCAPE CODE GUARD TIME = 425 MS 41 APPENDIX D: ELECTRICAL SPECIFICATIONS ______________________________________ Parameter Specifications --------------------------------------------------------------------- Transmission Rate 2400, 1200 and 300 bps character asynch. Transmission Channel Full Duplex QAM/PSK or FSK for two wire dial up Modulation Protocol V.22 bis; 16 point QAM at 600 bps V.22 and Bell 212A; 4 point QAM at 600 bps Bell 103; binary phase coherent FSK Transmit Frequencies Speed Low Band High Band 2400 1200 HZ 2400 HZ 1200 1200 HZ 2400 HZ 300 1270 HZ; Mark 2225 HZ; Mark 300 1070 HZ; Space 2020 HZ; Space Output Spectral Shaping Square root of 75% raised cosine; QAM/PSK Transmit Signal Level -9 dbm Receive Operating Range -9 dbm to -43 dbm Carrier Drop Out -48 dbm Line Equaliztion Fixed compromise equalization; transmit Adaptive equaliztion; receive (PSK/QAM) -5 Bit Error Rate 2400 bps: 10 at 17 db SNR -5 1200 bps: 10 at 9 db SNR -5 300 bps: 10 at 7 db SNR Diagnostics Local Analog Loopback L3 Local Analog Loopback L3 with self test DTE Interface Hayes 2400 "AT" command set Asynchronous Data Format 7 bit data; even, odd and no parity 1 or 2 stop bits 8 bit data; no parity, 1 or 2 stop bits Command Buffer 40 characters 42 Parameter Specifications ------------------------------------------------------------------ Auto dial Modes DTMF, Pulse or Tandem Stored Number Dialing Single 32 digit number storage in RAM DTMF Tone Symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Tone Duration Programmable 50 to 255 msec Governmental Approvals FCC part 68 and part 15 for domestic use ( sub-part J, section B ) approved for direct connection to the PSTN Physical Specifications Size: 5.25 inch x 3.90 inch Height: 0.70 in Power requirements 500ma at +5 V 20ma at -5 V 20ma at +12 V 20ma at -12 V 43 APPENDIX E: FCC PART 68 REGISTRATION ______________________________________ The Hook-Up 1200B is registered with the Federal Communications Commis- sion regarding connection to the switched telephone network as regulated by FCC rules and regulations, part 68. FCC places two restrictions on its use: 1- This modem cannot be connected to a party line or a payphone. 2- You should notify your local telephone company regarding connection of your modem to your phone line. FCC PART 15 CLASS B CERTIFICATION This equipment generates and uses radio frequency energy and if not in- stalled and used properly, that is in strict accordance with its instruc- tions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a class B com- puting device in accordance with the specifications in Subpart J or part 15 or FCC rules and regulations. However, there is no guarantee that in- terference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be terminated by turning it off the user is encouraged to try to correct the interference by one or more of the following measures: 1- Reorient the receiving antenna. 2- Relocate the computer with respect to the receiver. 3- Plug the computer into a different outlet. 44 APPENDIX F: TWO YEAR WARRANTY ______________________________ Computer Peripherals, Inc. warrants to the original consumer purchaser that each of its hardware products, and all components thereof, will be free from defect in material and/or workmanship for two years from the date of purchase. Any warranty hereunder is extended only to the original consumer and is not transferable. In the event of a malfunction or other indication of failure attributable directly to faulty workmanship and/or materials, Computer Peripherals, Inc. will at its option repair or replace the defective products or com- ponents, to whatever extent it shall deem necessary to restore the product or component to proper operating condition. Provided the consumer purchaser sends with the defective product proof of the date of purchase of the product. Before returning the product for repair, the customer must contact Computer Peripherals, Inc. customer service at (805) 499-5751 for a return authorization number. This number should be included with the customer's mailing address and phone number when the product is returned. There shall not be warranty for either parts or labor after the expiration of two years from the date of purchase. Units must be returned postage prepaid. Units returned without proof of date of purchase, or out of warranty units will be repaired and the cus- tomer will be charged for the parts and labor. The customer shall be solely responsible for the failure of the product or component thereof, resulting from accident, abuse, or misapplication of the product, and Computer Peripherals, Inc. assumes no liability as a consequence of such events under the terms of this warranty. While Computer Peripherals, Inc. has made every effort to provide clear and accurate technical information about the application of its products, Computer Peripherals, Inc. assumes no liability for any events arising out of the use of this technical information. Any and all implied warranties of merchantability and fitness for particular use, shall have no greater duration than the period for the expressed written warranty applicable to this product as shown above, and shall terminate automatically at the expiration of such period. No action shall be brought for breach of any implied or expressed warranty after one year subsequent to the expiration of the period of the expressed written warranty. Incidental and consequential damages caused by malfunction, defect or otherwise and with respect to breach of any expressed or implied warranty are not the responsibility of Computer Peripherals, Inc. and to the extent permitted by law, are hereby excluded both for property and to the extent not unconscionable, for personal injury damage. Computer Peripherals, Inc. 2635 Lavery Court # 5 Newbury Park, CA 91320 (805) 499-5751 45