RAD DATA COMMUNICATIONS
=======================

   CMN-C423/422

   Card Type         Serial interface converter                   
   Chipset           Unidentified                                 
   I/O Options       Serial port                                  
   Maximum Data Rate 19.2Kbps                                     
   Data Bus          Proprietary                                  

<gopher://bitreich.org/I/th99/i/P-R/53560-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |        Function         | Label |     Function     | Label |
   |-------------------------+-------+------------------+-------|
   | RS-423 DTE serial data  |  CN1  | Ground           |  SC1  |
   | port                    |       |                  |       |
   |-------------------------+-------+------------------+-------|
   | RS-422 DCE serial data  |  CN2  | Test mode switch |  SW1  |
   | port                    |       |                  |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Setting                 | Label | Position  |
   |----------------------------------------+-------+-----------|
   |>> | Receive line connected with 100    |  JP1  | Pins 2 &  |
   |   | ohm impedance                      |       | 3 closed  |
   |---+------------------------------------+-------+-----------|
   |   | Receive line not connected with    |  JP1  | Pins 1 &  |
   |   | 100 ohm impedance                  |       | 2 closed  |
   |---+------------------------------------+-------+-----------|
   |>> | Test switch enabled                |  JP2  | Pins 1 &  |
   |   |                                    |       | 2 closed  |
   |---+------------------------------------+-------+-----------|
   |   | Test switch disabled               |  JP2  | Pins 2 &  |
   |   |                                    |       | 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   |  LED  |  Color  | Status  |           Condition            |
   |-------+---------+---------+--------------------------------|
   |  PWR  |  Green  |   On    |          Power is on           |
   |-------+---------+---------+--------------------------------|
   |  PWR  |  Green  |   Off   |          Power is off          |
   |-------+---------+---------+--------------------------------|
   |  TD   | Yellow  |   On    |   Modem is transmitting data   |
   |-------+---------+---------+--------------------------------|
   |  TD   | Yellow  |   Off   | Modem is not transmitting data |
   |-------+---------+---------+--------------------------------|
   |  RX   | Yellow  |   On    |    Modem is receiving data     |
   |-------+---------+---------+--------------------------------|
   |  RX   | Yellow  |   Off   |  Modem is not receiving data   |
   |-------+---------+---------+--------------------------------|
   |  TST  |   Red   |   On    |     Modem is in test mode      |
   |-------+---------+---------+--------------------------------|
   |  TST  |   Red   |   Off   |   Modem is not in test mode    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                MISCELLANEOUS TECHNICAL NOTE                |
   |------------------------------------------------------------|
   | This card is intended for use in the CMN-16 rack-mount     |
   | system. The bus is used only for supplying power for the   |
   | card. All other card functions are accessed through the    |
   | serial port.                                               |
   +------------------------------------------------------------+