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- COURIER HIGH SPEED MODEMS
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- CHAPTER 2. SET-UP AND TESTING
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- Figure 2.1ΩCourier Dual Standard, one of
- three Courier High Speed Desktop Modems
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- PACKAGE COMPONENTS
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- Your Courier modem package contains the
- following items in addition to this
- manual:
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- ∙ The modem you purchased: Courier
- HST Dual Standard, Courier HST or
- Courier V.32 bis.
- ∙ An RJ11C phone cord.
- ∙ A power adapter.
- ∙ A Quick-Reference card, in this
- manual.
- ∙ A Settings Supplement, also in this
- manual. The supplement lists
- Courier DIP switch and other
- settings recommended for a number
- of popular communications software
- products.
- ∙ Your warranty card, to be filled
- out and returned to U.S. Robotics,
- Inc.
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- Set-up and Testing 2-1
-
- COURIER HIGH SPEED MODEMS
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- OPERATIONAL REQUIREMENTS
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- The Courier modem has minimal
- operational requirements. Be sure to
- read the information in the front of
- this manual about radio and television
- interference and connecting to the phone
- company. In addition, you should be
- aware of the following conditions.
-
- ∙ Follow the operating instructions
- in Appendix E, Dedicated Line and
- Leased Line Operation, if your
- phone line is user-installed or if
- it is leased from the telephone
- company. Also referred to as
- private, these lines are used for a
- direct, continuous connection
- between two modems. The connection
- is made without dialing.
- ∙ If your modem is installed in a
- Hewlett Packard system that uses
- the Ack/Enq communications
- protocol, be sure to follow the
- instructions at the end of Appendix
- E.
- ∙ If the modem is attached to a
- computer instead of a terminal, you
- need communications software. The
- software uses the modem's AT
- command set to control many
- communications functions, including
- configuring the modem, dialing, and
- answering calls, and also enables
- the transfer of files and other
- operations.
- Some users prefer their communica-
- tions software to take control of
- the modem, and are more comfortable
- with a program that makes the modem
- almost transparent. Others prefer
- a program that allows them to use
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- 2-2 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
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-
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- the modem's AT command set some-
- times, and their software at other
- times, depending on the task at
- hand. Whichever you prefer, review
- at least the Quick Start (Chapter
- 3) so that you have a basic
- understanding of the modem's
- requirements and operation.
-
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- RS-232 Requirements
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- You'll need an RS-232 cable to connect
- the modem to your computer or terminal.
- Use a shielded cable to ensure minimal
- interference with radio and television
- reception.
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- The modem takes a DB-25P (25-pin plug,
- or male) connector at one end of the
- cable. Computer equipment varies,
- however. Check the serial port at the
- rear of your machine, which may be
- labeled SERIAL, COMM PORT, or some other
- term (e.g., RS-232). If there are no
- labels, review your machine
- documentation to find out which is the
- serial port. (There may be more than
- one.) Don't use a port marked PARALLEL,
- PRINTER or AUX.
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- The physical serial port on the computer
- or terminal will be either a socket
- (female) or plug (male) that typically
- accommodates 25 or 9 pins. For example,
- the port on the IBM PC, XT and most
- compatibles requires a DB-25S (socket)
- connector, while the port on the IBM AT
- and some compatibles requires a DB-9S
- connector. Apple computers require a
- DB-25P, DB-9P or, more typically, an 8-
- pin round plug connector. Check your
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- Set-up and Testing 2-3
-
- COURIER HIGH SPEED MODEMS
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- computer documentation or with your
- computer dealer.
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- NOTE: Appendix B includes a listing of
- RS-232 pin assignments required to
- operate the modem. Be sure to check the
- appendix if you're not sure what type of
- cable you need, or if you're building
- your own. If your machine has other
- than a 25- or 9-pin port, check your
- computer documentation or consult your
- dealer to find out what type of RS-232
- connector is required.
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- WARNING: If you're planning to use the
- fastest computer-to-modem rate of 38.4K
- bps, follow the instructions concerning
- the RS-232 cable in Appendix B. The
- guidelines there will help you to avoid
- signal degradation at the 38.4K rate.
-
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- FRONT PANEL SWITCHES
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- Voice/Data
-
- This pushbutton switch is used primarily
- to switch between voice and data
- communications during a call. Detailed
- instructions are in Appendix E,
- Voice/Data Calls. The switch has
- multiple functions, however. Options
- are as follows:
-
- Disable the switch
- Force the modem off hook in Originate
- mode (default)
- Force the modem off hook in Answer
- mode
- Have the modem redial the last dialed
- number
- Have the modem dial the first number
- you've stored in nonvolatile memory
-
- 2-4 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
-
-
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- Toggle Auto Answer on and off
- Reset the modem to its defaults
- Initiate Remote Digital Loopback
- testing
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- Volume Control
-
- This is a rotary switch under the front
- panel, near the right corner. Turning
- it clockwise increases the volume of the
- modem's speaker. Turning it counter-
- clockwise decreases the volume.
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- FRONT PANEL INDICATORS
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- Below is a list of the modem's twelve
- status lights, or LEDs. See Appendix B
- for descriptions of their operations.
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- HS High Speed TR Data Terminal Ready
- AA Auto Answer MR Modem Ready
- (Power)
- CD Carrier Detect RS Request to Send
- OH Off Hook CS Clear to Send
- RD Received Data SYN Synchronous
- SD Send Data ARQ Automatic Repeat
- Request
- (Error Control)
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- INSTALLING THE MODEM
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- 1. Turn off the computer or terminal and
- its peripheral devices.
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- 2. Examine the label on the bottom of
- the modem. In addition to the
- summaries and other information, the
- label contains icons to aid in modem
- assembly. Check the interfaces at
- the back of the modem, shown in the
- following photograph.
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- Set-up and Testing 2-5
-
- COURIER HIGH SPEED MODEMS
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- Figure 2.2ΩInterface End, Courier Modem
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- 3. Now review the attached interfaces in
- Figure 2.3.
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- 2-6 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
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- Figure 2.3ΩConnected Courier Modem
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- 4. Check to make sure that the power
- switch is OFF; press it towards the
- zero in the 1/0 icon on the bottom
- label. Plug the power supply
- adapter's small connector into the
- power jack at the back of the modem.
- Plug the adapter into a standard 115-
- volt AC wall socket.
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- Disconnect your present phone cable
- from the wall jack. Plug one end of
- the phone cable that came with the
- modem into the modem's phone jack
- that is near the wall-jack icon on
- the bottom label. Plug the other end
- into the wall jack.
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- NOTE: Older telephone installations
- may not have the appropriate modular
- wall jack and plug. Adapters and
- RJ11C connectors are available from
- your telephone company or computer
- dealer.
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- If you want to keep your telephone
- connected for conventional calls,
- plug its cord into the jack at the
- rear of the modem near the phone
- icon. You can also use both your
- telephone and modem in one call,
- although not at the same time.
- Voice/Data, in Appendix E, explains
- how to switch control of the phone
- line between the phone and the modem.
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- 5. Next, check the positions of the bank
- of Dual In-Line Package (DIP)
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- Set-up and Testing 2-7
-
- COURIER HIGH SPEED MODEMS
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-
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- Switches located at the back of the
- modem. These switches are set at the
- factory to the positions most users
- require.
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- Figure 2.4ΩDIP Switch Factory Settings
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- The Settings Supplement that came
- with the manual shows recommended
- switch settings for many widely-used
- communications software products. If
- your communications software is not
- listed, check your software
- documentation for its requirements,
- particularly for DIP switches 1, 4, 5
- and 6. You'll also find descriptions
- of switch functions and options in
- Appendix B.
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- If you already know your
- requirements, use the guide on the
- bottom of the modem or the summary in
- the Quick Reference Card to verify
- the switch positions.
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- NOTE: If you have built your own RS-
- 232 cable and it does not support
- Data Terminal Ready (DTR), set DIP
- switch 1 DOWN, for the DTR override.
- The override causes the modem to
- operate as if the DTR signal is
- always ON, and enables the modem to
- accept commands. Most purchased
- communications software, however,
- requires DTR.
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- 2-8 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
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- DIP switch 10 is explained under
- Setting/Using Defaults in Chapter 5.
- Most users will want to leave this
- switch OFF, write their own defaults
- to nonvolatile memory (NVRAM), and
- have those defaults loaded at power
- on.
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- The wider Quad switch on the left of
- the numbered switches should be left
- UP unless you know your equipment
- reverses the
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- Set-up and Testing 2-9
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- COURIER HIGH SPEED MODEMS
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- transmit and receive pins at the RS-
- 232 interface (see Appendix B, DIP
- Switch Summary).
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- 6. The final step is to connect the
- modem to the computer's or terminal's
- serial port with the RS-232 cable
- described earlier in this chapter.
- Attach the appropriate connectors to
- the modem and to the serial port.
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- NOTE: To prevent overheating, do not
- cover the vents on the top of the modem
- case.
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- The modem is now ready to be tested and
- operated.
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- TESTING THE INSTALLATION
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- Use the following procedures to verify
- that your modem is working properly.
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- 1. Turn on your computer or terminal and
- clear the screen. Then turn the
- Courier's power switch ON. The
- following front panel indicators, or
- LEDs, will light up.
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- CD Carrier Detect, if you have set
- DIP switch 6 DOWN, enabling the CD
- override
- MR Modem Ready/Power ON
- CS Clear to Send
- TR Data Terminal Ready, if you have
- set DIP switch 1 DOWN, enabling
- the DTR override
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- For more information on the front
- panel indicators, see Appendix B.
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- 2-10 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
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- 2. If you're using a personal computer,
- load your communications software.
- If your software allows, perform the
- function that lets you send AT
- commands to the modem, that is, puts
- the computer in Terminal Mode. Some
- communications programs do this
- automatically upon loading. Others
- require you to display a
- communications or terminal screen,
- type a Function key, or perform some
- other operation.
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- If necessary, refer to your
- communications software documentation
- for instructions.
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- Set-up and Testing 2-11
-
- COURIER HIGH SPEED MODEMS
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- 3. Set your terminal or software to
- 19.2K bps or 9600 bps. In addition,
- set a word length of either 7 bits
- plus 1 parity bit, or 8 bits with no
- parityΩit doesn't matter which
- nowΩand 1 Stop bit.
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- 4. Check to see if your computer or
- terminal and modem are communicating
- with each other by sending the
- following attention command. Type
- either upper or lower case letters,
- not a combination, and then press the
- Enter (Carriage Return) key, shown in
- the example below between angle
- brackets. (Don't type the angle
- brackets.)
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- AT <Enter>
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- If everything is correct, the modem
- responds as follows:
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- OK
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- NOTE: The modem is shipped with DIP
- switch 4 UP, causing the modem to
- display (echo) your keyboard
- commands. If your entered command is
- not displayed, your local echo is
- OFF. To turn the local echo ON, send
- the modem the following command.
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- ATE1 <Enter>
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- If double characters appear on the
- screen, both your modem and software
- are set to local echo ON. Either set
- your software to local echo OFF, or
- turn the modem's echo OFF with the
- following command.
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- ATE0 <Enter>
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- 2-12 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
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-
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- Troubleshooting
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- If no OK appears on your screen, review
- the following checkpoints.
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- a. Make sure you type all upper or lower
- case letters and press <Enter>.
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- b. Check to see that you set your
- communications software to the
- correct serial port.
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- c. Make sure your software has put the
- computer in Terminal mode, so that
- you can send the modem commands.
- Then review Step 4, above.
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- Set-up and Testing 2-13
-
- COURIER HIGH SPEED MODEMS
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- d. Be sure that DIP switches 1 and 6 are
- set ON or OFF according to your
- terminal or software requirements.
- Review the table in Appendix B as
- well as your terminal or
- communications software
- documentation.
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- e. Both the Quad switch on the left and
- DIP switch 10 should be in the UP
- position.
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- f. If you set DIP switch 8 UP, for Dumb
- mode, reset the modem to Smart mode:
- set DIP switch 8 DOWN, power off the
- modem, and power it on again.
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- g. DIP switch 3 controls the display of
- the modem's result codes, including
- the OK result. The modem is shipped
- with DIP switch 3 DOWN, enabling the
- result codes. If DIP switch 3 is UP,
- reset it to the DOWN position. Then
- initiate the new switch setting with
- the following reset command.
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- ATZ <Enter>
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- 5. A final check of the modem is to see
- that it gets a dial tone. Type the
- following manual Dial command:
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- ATD <Enter>
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- On receipt of the command, the modem
- goes off hook and waits for a dial
- tone. The OH indicator lights, and
- you'll hear the dial tone from the
- modem's speaker. If you don't hear
- the dial tone, increase the volume by
- turning the volume control switch
- higher (clockwise). To cancel the
- operation, press any key.
-
- 2-14 Set-up and Testing
-
- COURIER HIGH SPEED MODEMS
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- If you don't hear a dial tone, check
- to see that the phone cable from the
- wall jack is connected to the jack
- identified by the wall jack icon on
- the bottom label of the modem case.
- If necessary, reconnect the phone
- cable correctly to jack near the wall
- jack icon, and try the ATD command
- again. Then try the manual Dial
- command again, ATD <Enter>.
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- Set-up and Testing 2-15
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