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

   ASM-31

   Modem Type               Data (synchronous/asynchronous)       
   Maximum Data Rate        128Kbps                               
   Data Bus                 External                              
   Data Modulation Protocol Proprietary                           

<gopher://bitreich.org/I/th99/t/P-R/51524-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |      Purpose       | Location |     Purpose     | Location |
   |--------------------+----------+-----------------+----------|
   | V.24, V.35, X.21,  |   CN1    | Diagnostic test |   DIG    |
   | RS-530             |          | switch          |          |
   |--------------------+----------+-----------------+----------|
   | AC power           |   CN2    | Analog loopback |   ANA    |
   |                    |          | switch          |          |
   |--------------------+----------+-----------------+----------|
   | Ground             |   GND    | Remote loopback |   REM    |
   |                    |          | switch          |          |
   |--------------------+----------+-----------------+----------|
   | Receive            |   RCV    | Test pattern    |   PATT   |
   |--------------------+----------+-----------------+----------|
   | Transmit           |   XMT    | Reset switch    |  RESET   |
   +------------------------------------------------------------+

                                  

   +------------------------------------------------------------+
   |                      ANALOG LOOPBACK                       |
   |------------------------------------------------------------|
   | Setting                    |              JP2              |
   |----------------------------+-------------------------------|
   |>> Enabled                  |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   | Disabled                   |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       ASYNC TO SYNC                        |
   |------------------------------------------------------------|
   | Setting                       |           SW1/S1           |
   |-------------------------------+----------------------------|
   |>> Synchronous                 |             On             |
   |-------------------------------+----------------------------|
   | Asynchronous                  |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         BAUD RATE                          |
   |------------------------------------------------------------|
   | Setting                       |            SW7             |
   |-------------------------------+----------------------------|
   | 600bps                        |             0              |
   |-------------------------------+----------------------------|
   | 1200bps                       |             1              |
   |-------------------------------+----------------------------|
   | 2400bps                       |             2              |
   |-------------------------------+----------------------------|
   | 4800bps                       |             3              |
   |-------------------------------+----------------------------|
   | 9600bps                       |             4              |
   |-------------------------------+----------------------------|
   | 19.2Kbps                      |             5              |
   |-------------------------------+----------------------------|
   | 38.4Kbps                      |             6              |
   |-------------------------------+----------------------------|
   | 48Kbps                        |             7              |
   |-------------------------------+----------------------------|
   |>> 64Kbps                      |             9              |
   |-------------------------------+----------------------------|
   | 128Kbps                       |             A              |
   |-------------------------------+----------------------------|
   | 57.6Kbps                      |             C              |
   |-------------------------------+----------------------------|
   | 115.2Kbps                     |             D              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            BIT                             |
   |------------------------------------------------------------|
   | Setting                      |           SW1/S2            |
   |------------------------------+-----------------------------|
   |>> 8 bit                      |             On              |
   |------------------------------+-----------------------------|
   | 7 bit                        |             Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         CD SIGNAL                          |
   |------------------------------------------------------------|
   | Setting                       |           SW1/S6           |
   |-------------------------------+----------------------------|
   |>> CD forced high              |             On             |
   |-------------------------------+----------------------------|
   | CD normal                     |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CHASSIS TO SIGNAL GROUND                  |
   |------------------------------------------------------------|
   | Setting                    |              JP4              |
   |----------------------------+-------------------------------|
   |>> Connected                |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   | Disconnected               |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        CLOCK SOURCE                        |
   |------------------------------------------------------------|
   | Setting       |    JP1/A     |    JP1/B     |    JP1/C     |
   |---------------+--------------+--------------+--------------|
   | Loopback      |    Closed    |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   |>> Internal    |     Open     |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   | External      |     Open     |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                          DSR/DTR                           |
   |------------------------------------------------------------|
   | Setting                       |           SW1/S7           |
   |-------------------------------+----------------------------|
   |>> Power ON                    |             On             |
   |-------------------------------+----------------------------|
   | DSR follows DTR               |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      PARITY - ON/OFF                       |
   |------------------------------------------------------------|
   | Setting                       |           SW1/S3           |
   |-------------------------------+----------------------------|
   |>> Enabled                     |             On             |
   |-------------------------------+----------------------------|
   | Disabled                      |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     PARITY - EVEN/ODD                      |
   |------------------------------------------------------------|
   | Setting                       |           SW1/S4           |
   |-------------------------------+----------------------------|
   |>> Even                        |             On             |
   |-------------------------------+----------------------------|
   | Odd                           |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      REMOTE LOOPBACK                       |
   |------------------------------------------------------------|
   | Setting                    |              JP3              |
   |----------------------------+-------------------------------|
   |>> Enabled                  |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   | Disabled                   |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                          STOP BIT                          |
   |------------------------------------------------------------|
   | Setting                       |           SW1/S5           |
   |-------------------------------+----------------------------|
   |>> 1 stop bit                  |             On             |
   |-------------------------------+----------------------------|
   | 2 stop bit                    |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED  | Color  |  Status  |            Condition            |
   |------+--------+----------+---------------------------------|
   | PWR  | Green  |    On    |           Power is on           |
   |------+--------+----------+---------------------------------|
   | PWR  | Green  |   Off    |          Power is off           |
   |------+--------+----------+---------------------------------|
   | RTS  | Yellow |    On    |     Request to Send enabled     |
   |------+--------+----------+---------------------------------|
   | RTS  | Yellow |   Off    |    Request to Send disabled     |
   |------+--------+----------+---------------------------------|
   |  TD  | Yellow |    On    |  Modem is transmitting steady   |
   |      |        |          |              SPACE              |
   |------+--------+----------+---------------------------------|
   |  TD  | Yellow |   Off    | Modem is not transmitting data  |
   |------+--------+----------+---------------------------------|
   |  TD  | Yellow | Blinking |   Modem is transmitting data    |
   |------+--------+----------+---------------------------------|
   |  RD  | Yellow |    On    | Modem is receiving steady SPACE |
   |------+--------+----------+---------------------------------|
   |  RD  | Yellow |   Off    |   Modem is not receiving data   |
   |------+--------+----------+---------------------------------|
   |  RD  | Yellow | Blinking |     Modem is receiving data     |
   |------+--------+----------+---------------------------------|
   | DCD  | Yellow |    On    |     Carrier signal detected     |
   |------+--------+----------+---------------------------------|
   | DCD  | Yellow |   Off    |   Carrier signal not detected   |
   |------+--------+----------+---------------------------------|
   | LOS  |  Red   |    On    |     Loss of synchronization     |
   |------+--------+----------+---------------------------------|
   | LOS  |  Red   |   Off    |      Synchronization 'OK'       |
   |------+--------+----------+---------------------------------|
   | ERR  |  Red   |    On    |     Errors in test pattern      |
   |------+--------+----------+---------------------------------|
   | ERR  |  Red   |   Off    |        Good test pattern        |
   |------+--------+----------+---------------------------------|
   | TEST | Yellow |    On    |       Modem in test mode        |
   |------+--------+----------+---------------------------------|
   | TEST | Yellow |   Off    |     Modem not in test mode      |
   +------------------------------------------------------------+