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-
- Installation Guide
- Reference Manual
- for
- Universal OS/2 Device Driver
- for
- DigiCHANNEL Intelligent
- Communications Boards
-
- 92000100C
-
-
- DigiBoard, DigiCHANNEL, PC/Xi, PC/16i, PC/8i, PC/Xe, PC/16e, PC/8e, PC/4e,
- PC/2e, Xem, PC/Xem, MC/Xem, EISA/Xem, COM/Xi, COM/8i, COM/4i, MC/Xi, MC/16i,
- MC/8i, MC/4i and C/X are trademarks of DigiBoard. All other brand and product
- names are the trademarks of their respective holders.
-
-
- c Digi International, Inc.
- All Rights Reserved
-
- Information in this document is subject to change without notice and does not
- represent a commitment on the part of DigiBoard.
- DigiBoard provides this document "as is," without warranty of any kind, either
- expressed or implied, including, but not limited to, the particular purpose.
- DigiBoard may make improvements and/or changes in this manual or in the product(
- s) and/or the program(s) described in this manual at any time.
- This product could include technical inaccuracies or typographical errors.
- Changes are periodically made to the information herein; these changes may be
- incorporated in new editions of the publication.
-
- RESTRICTED RIGHTS:
-
- For non-U. S. Government use:
- These programs are supplied under a license. They may be used, disclosed,
- and/or copied only as permitted under such license agreement. Any copy must
- contain the above copyright notice and this restricted rights notice. Use,
- coping , and/or disclosure of the programs is strictly prohibited unless
- otherwise provided in the license agreement.
-
- For U.S. Government use:
- Use, duplication, or disclosure by the Government is subject to restrictions
- as set forth in sub-paragraph (c)(1)(ii) of the Rights in Technical Data and
- Computer Software clause of DFARS 52.227-7013.
-
- Table of Contents
- Table of Contents 3
- Introduction 4
- The Distribution Diskette 6
- Installing the Device Driver 7
- Global Parameters 7
- Per-Card Parameters 10
- Examples 13
- Testing the Ports 15
- Troubleshooting 16
- Error Messages 18
- DMODE I/O Port Configuration Utility 19
- Examples 23
- Appendix-Synchronous Communications Modes 25
-
-
- Introduction
- This release of the DigiWARE device driver for OS/2 supports the
- entire line of DigiCHANNEL intelligent asynchronous serial
- communications controllers:
-
- Micro Channel (MCA) bus:
- DigiCHANNEL MC/Xi 4, 8 and 16 port boards
- DigiCHANNEL MC C/X cluster controller system
- DigiCHANNEL MC/Xem
- PC/AT (ISA) bus:
- DigiCHANNEL PC/Xe 2, 4, 8 and 16 port boards
- DigiCHANNEL PC/Xi 8 and 16 port boards
- DigiCHANNEL COM/Xi 4 and 8 port boards
- DigiCHANNEL ISA C/X cluster controller system
- DigiCHANNEL PC/Xem
- EISA bus:
- DigiCHANNEL EISA C/X cluster controller system
- DigiCHANNEL EISA/Xem
-
- The device driver software supports multiple boards and multiple
- board types in a single machine, and can handle up to 256 ports
- from any combination of the boards listed above. As new products
- are introduced, the driver will be upgraded to include those devices
- as well.
- The driver takes all its configuration information from the device=
- command line in CONFIG.SYS, and all DigiCHANNEL intelligent
- boards in a system are configured from a single command line.
-
-
- In addition to the device driver, the configuration utility
- DMODE.EXE is provided to change communication parameters for
- individual ports without rebooting. DMODE.EXE is similar to the
- OS/2 MODE command, but has some added features, and supports
- communications devices beyond OS/2's range of COM1 to
- COM8.
-
-
- Before installing this device driver software,
- complete the installation of the DigiCHANNEL
- intelligent communications board(s) in your
- system, according to the hardware installation
- manual provided with the board(s), and write
- down your configuration! The driver supports all
- legal I/O and memory address settings, but must
- be informed of these settings in the device driver
- command line.
-
-
- The Distribution Diskette
- The diskette accompanying this manual contains all of the files and
- documentation needed to install the DigiWARE OS/2 Universal
- Intelligent Device Driver in your system. A list of these files
- follows:
-
- XALL.SYS The installable device driver.
- DMODE.EXE A MODE work-alike program for configuring I/O
- ports beyond COM8.
- INSTALL.DOC Installation instructions for the current
- release of the driver.
- RELNOTES.DOC Release notes.
- DMODE.DOC Instructions for the DMODE program.
- XALL.DOC Programmer's information about the driver
- and applicable system calls.
- *.bin Miscellaneous binary files used by the driver.
-
-
- Installing the Device Driver
-
- Copy all of the files from the distribution diskette to a single
- directory on your hard drive. By default, driver and data files are
- expected to be in \DIGI.
-
- The device driver is invoked by placing its name and configuration
- arguments into the system's CONFIG.SYS file. All Digi-
- CHANNEL intelligent asynchronous serial communications boards
- must be installed from a single command line, which contains
- complete set-up information for each board. The format of the
- command line is:
-
- device=\digi\xall.sys [/n:names] [/b:baud] [/d:dtype]
- [/f:digipath] [/v:messagepath] /t:card /p:port /m:mem [,
- /t:card /p:port /m:mem] [, ...]
-
- Note that the path for XALL.SYS is \DIGI. This is the default
- path. If an alternative path is specified with the /f:digipath option,
- substitute that path for \DIGI.
-
-
- The above command line must appear on a single
- command line in the CONFIG.SYS file. This line
- may be up to 255 characters long.
-
-
- Global Parameters
-
- The first six parameters in the command line above are global
- parameters, and affect all boards installed. These parameters are
- optional, and may be omitted. If omitted, default values will be
- used.
-
- /n:names
-
- Defines the naming convention to be use for the
- DigiCHANNEL ports. names consists of an optional
- "stem" followed by the starting device number. The
- new stem must be enclosed in double-quotes (""). If
- the stem is omitted, "COM" will be used. If the
- number is omitted, "3" will be assumed. If the /n
- parameter is not specified, the default name COM3 will
- be assigned to the first port.
-
- /n:"digi"0 DIGI0, DIGI1, DIGI2, ... DIGIn
- /n:4 COM4, COM5, COM6, ... COMn
- /n:"qdev" QDEV3, QDEV4, QDEV5, ... QDEVn
-
- /b:baud
-
- Sets the default baud rate to be used for all ports. If this
- parameter is not specified, all ports will be set to the
- OS/2 default of 1200 baud. Baud rates of up to 38,400
- are supported. Use the DMODE.EXE command to set
- baud rates of individual ports.
-
- /b:9600 Initializes all ports to 9600 baud.
-
- /d:dtype
-
- Sets the initial data type (parity, character length and
- number of stop bits). If this parameter is omitted, the
- OS/2 default data type of even parity, 7 data bits and 1
- stop bit is used. The syntax is pds, where p is E, O or N;
- d is 8, 7, 6 or 5; and s is 1 or 2. All three values must
- be supplied, in the correct order.
-
- /d:N81 No parity, 8 data bits, 1 stop bit.
-
- /f:digipath
-
- Defines an alternative directory path for the driver and
- data files. If this option is present, all files from the
- distribution diskette must be present in this directory.
-
- /f:d:\drvr\digi
- All data files are in "D:\DRVR\DIGI".
-
-
-
- /v:messagefile
-
- Forces the driver to direct all verbose messages to the
- file named. If /v: is given without a filename,
- messages will be placed in \XALL.MSG. This flag
- prevents any information from being displayed on the
- console; useful in some situations as when the machine
- is a "headless server", where calls to Standard Output
- will cause problems. Without this flag, all messages will
- appear on the system console.
-
- The message file is overwritten each time the system is
- started.
-
- /v:errmsg Writes banner and other info to file
- "\ERRMSG".
-
- /v: Writes banner and other info to file
- "\XALL.MSG".
-
- /a:a Enable the alternate pin assignment of Data Carrier
- Detect (DCD) for all ports (see discussion of Alt-Pin
- processing on page 24).
-
-
- Per-Card Parameters
-
- The remaining three parameters are per-card parameters, and are
- used to inform the driver of the type of board and where it is to be
- addressed in the host's I/O and memory buses. These parameters
- are mandatory, and must be given for each board!
-
- The per-card parameters must be given in complete sets, and the
- sets must be separated by commas.
-
- /t:card
-
- Defines the card type to the driver. Legal values for
- card are: i for the ISA C/X, e for the EISA C/X, m for
- the MC C/X, p for Xem systems (PC/Xem, MC/Xem
- or EISA/Xem) and x for COM/Xi boards. This
- parameter must be omitted for PC/Xe, PC/Xi and
- MC/Xi boards. The designators i, e, and m must be
- followed by an additional two digits defining the
- number and arrangement of DigiCHANNEL C/CON-
- 16 or C/CON-16e concentrators on each host adapter
- channel. If the concentrator(s) are connected to the host
- adapter via a dial-up or leased line (remote
- concentrators), each of the two digits must be followed
- by a parameter, enclosed in parentheses, specifying the
- synchronous communications mode to be used for that
- line. See the Appendix for a list of available
- synchronous communications modes.
-
- /t:i10 ISA C/X, one local concentrator on line 1
- only.
- /t:e11 EISA C/X, one local concentrator on each of
- lines 1 and 2.
- /t:m21 MC C/X, two local concentrators on line 1
- and 1 on line 2.
- /t:e12 EISA C/X, one local concentrator on line 1,
- and two on line 2.
- /t:i22 ISA C/X, two local concentrators on each of
- lines 1 and 2.
- /t:i2(21)3(27)
-
- ISA C/X, two remote concentrators on line
- 1, and two remote concentrators on line 2.
- The concentrators on line 1 will use mode
- #21 (76,800 baud, 8-wire, external clock) to
- communicate with the host adapter, and the
- concentrators on line 2 will use mode #27
- (614,400 baud, 8-wire, internal clock). See
- the Appendix for a list of synchronous
- communications modes.
-
- /t:x COM/Xi (4 or 8 channels)
- /t:p PC/Xem, MC/Xem or EISA Xem
-
- /p:port Defines the I/O port address for the card.
-
- /p:300 Board is addressed at I/O port 300h.
- /p:2005 EISA board (EISA C/X or EISA/Xem
- host adapter) is in slot 2 (EISA I/O
- addresses are 4 digits-the slot number,
- followed by "005").
-
- When plugging an ISA board (PC/Xe, ISA C/X host
- adapter, etc.) into an EISA machine, the /p parameter
- must contain the 3-digit I/O address as set by the DIP
- switches on the board, and not the 4-digit address based
- on the EISA slot number.
-
-
- /m:mem
-
- Dual-ported memory starting address. This is the full
- 32-bit hexadecimal address of the beginning of the
- board's dual-ported memory.
-
- /m:d0000 Sets dual-ported memory start
- address to 0D0000h (in the BIOS
- expansion area between 640K and 1
- megabyte).
- /m:e80000 Sets start address of E80000h (in the
- fifteenth megabyte).
-
- EISA and ISA boards (except the COM/Xi), may all
- share the same memory starting address. COM/Xi and
- all Micro Channel boards must each have unique
- memory addresses.
-
-
- Examples
-
- The following examples start out with just the minimum to install a
- DigiCHANNEL board. After locating an example for your type of
- board, read the rest of the examples for optional situations that may be
- appropriate to your application. Default options will be altered by your
- application program(s) when you configure the application.
-
- Example 1: COM/Xi
-
- One COM/Xi at I/O port 300h, memory start address D8000h;
- devices to be named COM5 COM6, etc. All data files are in the
- directory \DIGI:
-
- device=c:\digi\xall.sys /n:5 /p:300 /m:d8000 /t:x
-
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
- Example 2: PC/Xe, PC/Xi
- One PC/Xe (or PC/Xi) at I/O port 220h, memory address D0000h
- Ports will be named COM3, COM4, etc. (default names). All data
- files are in the directory \MISC\DIGI:
-
- device=c:\misc\digi\xall.sys /f:\misc\digi /p:220 /m:d0000
-
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
-
- Example 3: MC/Xi
-
- One MC/Xi at I/O port F1F0h, memory address FC0000h. Devices
- will be named DIGI1, DIGI2, etc. and will have an initial baud rate of
- 38,400. All data files are in the default directory \DIGI:
-
- device=c:\digi\xall.sys /n:"digi"1 /b:38400 /p:F1F0 /m:FC0000
-
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
- Example 4: Two board installation with optional global
- parameters.
-
- Two PC/Xi (or PC/Xe) boards at I/O ports 320h and 300h, with dual-
- ported memory of both starting at D0000h. Ports will be named
- COM0, COM1, etc., and will be initialized to 38,400 baud, no parity,
- 8 data bits and 1 stop bit; messages will be contained in the file
- MESSAGES.MSG located in the \DIGI directory. All data files are in
- the default directory \DIGI:
-
- device=c:\digi\xall.sys /n:0 /b:38400 /v:\digi\messages.msg
- /d:N81 /p:320 /m:D0000, /p:300 /m:D0000
-
-
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
- Example 5: PC/Xem
-
- One PC/Xem at I/O port 224h, memory start address C8000h; devices
- to be named COM3 COM4, etc. All data files are in the default
- directory \DIGI:
-
- device=c:\digi\xall.sys /p:224 /m:C8000 /t:p
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
-
-
- Example 6: ISA C/X
-
- One ISA C/X host adapter at I/O port 228h, memory address
- D0000h, with one concentrator on line 1 and two on line 2. Devices to
- be named DCX1, DCX2, etc. and will have an initial baud rate of
- 38,400. All data files are in the default directory \DIGI:
-
- device=c:\digi\xall.sys /n:"dcx"1 /b:38400 /p:228 /m:d0000 /t:i12
-
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
- Example 7: EISA C/X with a remote concentrator via an RS-
- 232 synchronous modem.
-
- One EISA C/X host adapter in slot 3, memory address D8000h, with
- two local concentrators on line 1 and one remote concentrator at 9600
- baud and external clocking on line 2. Devices to be named COM5,
- COM6, etc. and will have an initial baud rate of 19,200. All data files
- are in the directory \OS2\DIGI:
-
- device=c:\os2\digi\xall.sys /n:5 /b:19200 /f:c:\os2\digi
- /p:3005 /m:d8000 /t:e21(17)
- (Note that the above must all appear on one line in CONFIG.SYS)
-
-
-
- Example 8: MC C/X and MC/Xem
- One MC C/X host adapter at I/O port 228h, memory address
- D8000h, with one concentrator on line 1 and one concentrator on line
- 2; one MC/Xem at I/O Port 304h, memory address D0000h. Devices
- will be named DIGI1, DIGI2, etc. and will have an initial baud rate of
- 38,400, Alt-Pin enabled, no parity, 8 data bits, and 1 stop bit. All data
- files are in the default directory \DIGI:
-
- device=c:\digi\xall.sys /n:"digi"1 /b:38400 /a:a /d:N81 /p:228
- /m:d8000 /t:m11, /p:304 /m:d0000 /t:p
-
- (Note that the above must all appear on one line in CONFIG.SYS)
- (Note that for MC C/X and MC/Xem, the addresses 104 and 108
- should not be used to avoid possible conflicts)
-
-
- Testing the Ports
-
- The simplest (and probably the best) way to check the driver and
- I/O connections is to connect an ASCII terminal to one of the ports
- and redirect some output to that port. If the terminal is connected to
- COM3, try something like the following:
-
- dmode com3 (this will verify that the driver can find the
- port-the port's parameters will be displayed.)
-
- dmode com3 octs=off odsr=off
- (this insures that the hardware handshaking
- signals CTS and DSR will not prevent output-
- we are not concerned with flow control at this
- time.)
-
- dir > com3 (this redirects the current directory to COM3.)
-
- The console should simply respond by repeating the C:\> prompt,
- and the current directory (in this case, C:\) will appear on the
- terminal.
-
-
- Troubleshooting
-
- If the C:\> prompt doesn't reappear, and the system seems to be
- "hung", you probably used a memory start address that is being
- used by some other device, or the board is not set for the address
- specified in CONFIG.SYS. Try a different address. If it still hangs,
- try a different I/O port. If your computer has a memory cache and
- the board's memory start address is above 1 megabyte, try either
- disabling the cache or moving the board to a low-memory address
- (D0000 is usually a good choice).
-
- It is also possible that a conflict exists with another device driver
- which has been loaded via CONFIG.SYS. The XALL.SYS line
- should be placed near the end of the CONFIG.SYS, and must not
- be placed before the DEVICE=TESTCFG.SYS line.
- Due to potential device naming conflicts, the pair of lines
-
- DEVICE=\OS2\COM.SYS
- and
- DEVICE=\OS2\VCOM.SYS
-
- may cause problems. Be sure that the XALL.SYS line is placed
- before these lines in CONFIG.SYS. If the XALL.SYS driver
- generates an error message, try temporarily putting "REM" in front
- of the above two lines. If this works, there is probably a naming
- conflict. You may need to add a /n: command line flag to the
- XALL.SYS line to force the driver to use a different base name or
- start numbering the COM devices at 5 or above.
-
- If the C:\> prompt does reappear, but there is no output on the
- terminal screen, there is probably a cabling problem. Make sure
- that all cable plugs are securely seated in receptacles, and that they
- are configured correctly (see the appropriate section of the
- hardware installation guide for your board).
-
- If the terminal displays output, but the data on the screen is garbled,
- the terminal is probably not set with the same baud rate and data
- type as specified in CONFIG.SYS (or the defaults, if not specified).
- Verify these settings.
-
- If everything checks out and you still have problems, there could
- be a problem with your board. Contact your distributor or
- DigiBoard Technical Support for further assistance.
-
-
- Error Messages
-
- If, when the driver is loaded, it cannot find the board(s), or if they
- fail to respond properly to commands, certain error messages may
- be sent to the console. These error messages are defined in the
- following table:
-
- Could not find BIOS file
- Could not find FEP file
- Could not find data file
-
- One or more files were missing from the digipath directory.
- The default digipath directory is /digi. If you have loaded the
- driver and data files into a different directory, that directory
- must be specified in the xall command line with the
- /f:digipath parameter.
-
- IO Port Not Responding
-
- I/O port address set incorrectly, or conflicting with some other
- device. Verify setting, or try a different address.
-
- DigiBoard BIOS Will Not Boot
- DigiBoard BIOS Will Not Respond
- DigiBoard FEPOS Will Not Boot
-
- BIOS on DigiCHANNEL board will not respond to commands
- from the driver. Typically due to a memory conflict, or a
- memory cache conflict.
-
- Driver Failed to Hook Timer
- System Cannot Allocate Memory
-
- A system call to OS/2 has failed.
-
- Invalid Command Line Arguments
-
- Syntax error in the command line in CONFIG.SYS. Double-
- check your entries.
-
-
-
- DMODE I/O Port Configuration Utility
-
- DMODE is DigiBoard's I/O channel configuration utility. DMODE
- functions like the OS/2 MODE command, but is more flexible, and
- provides some added features.
-
- * Supports communications device names other than COM1-
- COM8.
- * Any single parameter may be changed without causing all
- others to be reset to default values.
- * Can be used to enable or disable the Alt-Pin feature on
- individual ports.
- * Maintains the familiar MODE syntax.
-
- DMODE arguments may be entered in any order, and in many cases
- may be abbreviated. For example, a baud rate of 19,200 may be
- entered simply as "19", since within the context of the DMODE
- command, "19" cannot be interpreted as anything else. Arguments
- may be separated by spaces or commas, and unspecified
- parameters are left unchanged. DMODE returns the settings of all
- parameters after any requested changes have been made. If no
- parameters are given, DMODE simply returns the current settings.
-
- The syntax of DMODE is:
-
- dmode port_name [parameters]
-
-
- Port names and parameters are not case sensitive, so upper and
- lower case letters may be freely mixed without effect on the
- operation of the DMODE command.
-
- The following parameters are accepted:
-
- Baud Rate Baud rates can be specified with 2 to 5 digit
- designations, according to the following table:
-
- Accepted Values Baud Rate
-
- 11 110 110
- 15 150 150
- 30 300 300
- 60 600 600
- 12 120 1200 1200
- 24 240 2400 2400
- 48 480 4800 4800
- 96 960 9600 9600
- 19 192 1920 19200 19200
- 38 384 3840 38400 38400
- 56 567 5670 56700 56700
-
-
-
- Character Length
-
- Characters may be 5, 6, 7 or 8 bits long. Enter the
- appropriate number in the DMODE arguments.
-
- Parity Enter the desired parity checking method with a single
- letter E, O, N, M or S for Even, Odd, None, Mark or
- Space, respectively.
-
- Stop Bits Enter the desired number of stop bits. Recognized
- values are 1, 2 and 1.5.
-
- Flags DMODE supports the following flags in the same way as
- the OS/2 MODE command. Refer to your OS/2
- documentation for explanations of the flags. To set a
- flag, enter the mnemonic for the flag, followed by an
- equals sign (=), and the desired value (ON, OFF, etc.).
-
- Read Timeout Flag
- TO=ON Read timeout in effect.
- TO=OFF No timeout.
-
- XON/XOFF Handshake Flag
- XON=ON XON/XOFF handshaking enabled.
- XON=OFF XON/XOFF handshaking disabled.
-
- Input DSR Sensitivity
- IDSR=ON Enables Input DSR Sensitivity.
- IDSR=OFF Disables Input DSR Sensitivity.
-
- Output DSR Sensitivity
- ODSR=ON Enables Output DSR Sensitivity.
- ODSR=OFF Disables Output DSR Sensitivity.
-
-
- Output Handshake on CTS
- OCTS=ON Enables CTS output flow control.
- OCTS=OFF Disables CTS output flow control.
-
- DTR Signal Control
- DTR=ON Sets DTR to "ON" or HIGH.
- DTR=OFF Sets DTR to "OFF" or LOW.
- DTR=HS DTR used for output flow control.
-
- RTS Signal Control
- RTS=ON Sets RTS to "ON" or HIGH.
- RTS=OFF Sets RTS to "OFF" or LOW.
- RTS=HS RTS used for output flow control.
- RTS=TOG Toggles RTS from LOW to HIGH, or
- from HIGH to LOW.
-
- Alt-Pin Processing
- ALT=ON Internally swaps DSR and DCD signals
- (see explanation below).
- ALT=OFF DSR and DCD are not swapped.
-
- DigiCHANNEL products use 10-pin RJ-45
- connectors in order to support all of the signals
- normally available on a 9-wire RS-232 connection.
- However, many commercially available RJ-45
- connectors have only 8 pins. 8-pin RJ-45 plugs will
- fit in a 10-pin jack, but the first and last pins
- (numbers 1 and 10) are not connected. DigiBoard
- uses these pins for the modem control signals RI
- (Ring Indicator, pin 1) and DCD (Data Carrier
- Detect, pin 10). While Ring Indicator is rarely a
- concern (since most modems have auto-answer
- capability), Data Carrier Detect is often monitored to
- insure that the modem has established, and is
- maintaining, a valid connection with a remote
- modem.
-
- To facilitate the use of 8-pin RJ-45 connectors in
- modem applications, a special DMODE flag, ALT, has
- been provided. ALT instructs the device driver to
- monitor pin 1 of an 8-pin RJ-45 for DCD.
-
- See the Hardware Installation guide for your board
- for cabling diagrams and pin assignment charts for
- DB-25 and RJ-45 connectors.
-
- Examples
-
- dmode digi12
- Returns the current settings of device digi12. No changes are
- made.
-
- dmode com5 2
- Configures COM5 for 2 stop bits. All other parameters remain
- unaffected.
-
- dmode com5:38 rts=on
- Configures COM5 for a baud rate of 38,400 and sets RTS to "ON"
- or HIGH.
-
- dmode com5 8
- Configures COM5 for 8 data bits. No other parameters are
- affected.
-
- dmode comdv83 idsr=off, to=off e 7 12
- Sets COMDV83 to disable Input DSR Sensitivity, disable input
- timeout, select even parity, 7 data bits and a baud rate of 1200.
-
- dmode com5 38 alt=on
- Sets up COM5 for a baud rate of 38,400, and enables Alt-Pin
- Processing.
-
- dmode com5 e alt=off
- Sets COM5 for even parity checking and disables Alt-Pin
- processing.
-
- dmode com3 odsr=off octs=off
- Disables sensing of output flow control signals Clear To Send
- (CTS) and Data Set Ready (DSR).
-
-
- Appendix-Synchronous Communications Modes
-
- The DigiCHANNEL C/X host adapter communicates with attached
- C/CON-16 concentrators via two RS-422 synchronous channels
- (newer concentrators and host adapters also support RS-232
- synchronous communication-see your hardware Installation
- Guide). The default operating mode for these channels is 1.2
- megabaud, 8-wire, internally clocked. This provides the fastest
- possible communication between the host adapter and locally
- connected concentrators (in this context, local indicates that
- concentrators are connected directly, via a 4 or 8 wire cable, to the
- host adapter; remote refers to concentrators that are connected to
- the host adapter via data communications devices such as modems
- or DSUs).
-
- Local concentrators always communicate with the host adapter in
- either an eight wire internally clocked mode or a four wire self-
- clocked mode (in the four wire modes the clock is encoded with
- the data instead of being carried on separate lines as in the eight
- wire modes).
-
- Remote concentrators always use an eight wire externally clocked
- mode (the clock signal is provided by the synchronous modem).
-
- The table on the following page shows the modes that are
- supported by the XALL.SYS device driver. Note that the external
- clock baud rates are approximates used to set up time-outs and
- tuning parameters only. Values do not need to be exact; select the
- speed closest to the actual sped of your synchronous modem.
-
-
-
- Eight-Wire Eight-Wire Four-Wire
- Internal Clock Enternal Clock Self-Clocking
-
- Mode Baud Rate Mode Baud Rate Mode Baud Rate
- Mode
-
- 0 115k 15 2400 1 250k
- 16 4800 2 460k
- 3 2400 17 9600
- 4 4800 18 19.2k
- 5 9600 19 38.4k
- 6 19.2k 20 57.6k
- 7 38.4k 21 76.8k
- 8 57.6k 22 115k
- 9 76.8k 23 230k
- 10 115k 24 460k
- 11 230k 25 920k
- 12 460k 26 1.2M
- 13 920k
- 14 1.2M 29 614k
- 30 737k
- 27 614k
- 28 737k
-
-