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

   SRM-6DC

   Modem Type               Data (Asynchronous)                   
   Maximum Data Rate        38.4Kbps                              
   Data Bus                 External                              
   Data Modulation Protocol Proprietary                           

<gopher://bitreich.org/I/th99/t/P-R/51507-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |     Purpose      | Location |      Purpose      | Location |
   |------------------+----------+-------------------+----------|
   | RS-232/422       |   CN1    | Ground            |   GND    |
   |------------------+----------+-------------------+----------|
   | Receive positive |   +RCV   | Transmit positive |   +XMT   |
   |------------------+----------+-------------------+----------|
   | Receive negative |   -RCV   | Transmit negative |   -XMT   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         CD SIGNAL                          |
   |------------------------------------------------------------|
   | Setting                    |              JP1              |
   |----------------------------+-------------------------------|
   |>> Forced high              |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   | Normal                     |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            ECHO                            |
   |------------------------------------------------------------|
   | Setting                    |              JP3              |
   |----------------------------+-------------------------------|
   |>> On                       |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   | Off                        |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         IMPEDANCE                          |
   |------------------------------------------------------------|
   | Setting                    |              JP4              |
   |----------------------------+-------------------------------|
   |>> Low                      |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   | High                       |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      LINE CONNECTION                       |
   |------------------------------------------------------------|
   | Setting                    |              JP2              |
   |----------------------------+-------------------------------|
   |>> 4-wire                   |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   | 2-wire                     |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+