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

   LDV-2

   Modem Type               Data (synchronous/asynchronous)       
   Maximum Data Rate        19.2Kbps                              
   Data Bus                 External                              
   Data Modulation Protocol Prorietary                            

<gopher://bitreich.org/I/th99/t/P-R/51520-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose  | Location |          Purpose          | Location |
   |----------+----------+---------------------------+----------|
   | Line out |   CN1    | Digital loopback switch   |   DLB    |
   |----------+----------+---------------------------+----------|
   | Line in  |   CN2    | Data clamp and loop 1     |  DC-L1   |
   |          |          | test switch               |          |
   |----------+----------+---------------------------+----------|
   | RS-232   |   CN3    | Remote digital loopback   |   RLB    |
   |          |          | switch                    |          |
   |----------+----------+---------------------------+----------|
   | AC power |   CN4    | Fuse                      |   FUSE   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         BAUD RATE                          |
   |------------------------------------------------------------|
   | Setting                       |            SW1             |
   |-------------------------------+----------------------------|
   | 19.2Kbps                      |             0              |
   |-------------------------------+----------------------------|
   | 14.4Kbps                      |             1              |
   |-------------------------------+----------------------------|
   | 9600bps                       |             2              |
   |-------------------------------+----------------------------|
   | 7200bps                       |             3              |
   |-------------------------------+----------------------------|
   |>> 4800bps                     |             4              |
   |-------------------------------+----------------------------|
   | 3600bps                       |             5              |
   |-------------------------------+----------------------------|
   | 2400bps                       |             6              |
   |-------------------------------+----------------------------|
   | 1800bps                       |             7              |
   |-------------------------------+----------------------------|
   | 1200bps                       |             8              |
   |-------------------------------+----------------------------|
   |            900bps             |             9              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CARRIER TRANSMISSION LEVEL                 |
   |------------------------------------------------------------|
   | Setting                    |  JP5/A   |  JP5/B   |  JP5/C  |
   |----------------------------+----------+----------+---------|
   | Long distance (-50dBm)     |  Closed  |   Open   |  Open   |
   |----------------------------+----------+----------+---------|
   |>> Medium distance (-40dBm) |   Open   |  Closed  |  Open   |
   |----------------------------+----------+----------+---------|
   | Short distance (-30dBm)    |   Open   |   Open   | Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         CD SIGNAL                          |
   |------------------------------------------------------------|
   | Setting                |   JP7/A   |   JP7/B   |   JP7/C   |
   |------------------------+-----------+-----------+-----------|
   |>> CD forced high.      |  Closed   |   Open    |   Open    |
   |------------------------+-----------+-----------+-----------|
   | CD follows RTS signal. |   Open    |  Closed   |   Open    |
   |------------------------+-----------+-----------+-----------|
   | CD normal.             |   Open    |   Open    |  Closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                CENTRAL/REMOTE UNIT SELECTOR                |
   |------------------------------------------------------------|
   | Settings                   |              JP1              |
   |----------------------------+-------------------------------|
   | Central unit               |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Remote unit              |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CHASSIS TO SIGNAL GROUND                  |
   |------------------------------------------------------------|
   | Setting                    |              JP8              |
   |----------------------------+-------------------------------|
   | Connected                  |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |>> Disconnected             |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        CLOCK SOURCE                        |
   |------------------------------------------------------------|
   | Setting       |    JP4/A     |    JP4/B     |    JP4/C     |
   |---------------+--------------+--------------+--------------|
   | External      |    Closed    |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   |>> Internal    |     Open     |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   | Receive       |     Open     |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   DATA CLAMP/LOOP1 TEST                    |
   |------------------------------------------------------------|
   | Setting                    |             JP10              |
   |----------------------------+-------------------------------|
   | Enabled                    |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Disabled                 |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  ENABLES TEST PUSHBUTTONS                  |
   |------------------------------------------------------------|
   | Setting                       |            JP9             |
   |-------------------------------+----------------------------|
   |>> DLB, DC-L1, RLB enabled     |     Pins 1 & 2 closed      |
   |-------------------------------+----------------------------|
   | Disabled                      |     Pins 2 & 3 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       REMOTE LOOPACK                       |
   |------------------------------------------------------------|
   | Setting                    |             JP11              |
   |----------------------------+-------------------------------|
   | Enabled                    |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Disabled                 |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       RTS/CTS DELAY                        |
   |------------------------------------------------------------|
   | Setting       |    JP3/A     |    JP3/B     |    JP3/C     |
   |---------------+--------------+--------------+--------------|
   | 0 ms          |    Closed    |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   |>> 8 ms        |     Open     |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   | 68 ms         |     Open     |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SYNCHRONOUS/ASYNCHRONOUS SELECTOR              |
   |------------------------------------------------------------|
   | Settings                   |              JP2              |
   |----------------------------+-------------------------------|
   | Synchronous                |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Asynchronous             |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       TRANSMIT LEVEL                       |
   |------------------------------------------------------------|
   | Remote/Central mode |   JP6/A    |   JP6/B    |   JP6/C    |
   |---------------------+------------+------------+------------|
   |>> 0dBm/-6dBm        |   Closed   |    Open    |    Open    |
   |---------------------+------------+------------+------------|
   | -3dBm/-9dBm         |    Open    |   Closed   |    Open    |
   |---------------------+------------+------------+------------|
   | -6dBm/-12dBm        |    Open    |    Open    |   Closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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   |
   |------+--------+----------+---------------------------------|
   | TEST |  Red   |    On    |       Modem in test mode        |
   |------+--------+----------+---------------------------------|
   | TEST |  Red   |   Off    |     Modem not in test mode      |
   +------------------------------------------------------------+