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# RAD DATA COMMUNICATIONS
SRM-8H (RJ-11)
Card Type Short Range Modem
Chip Set Unidentified
I/O Options 25-pin DTE port, RJ-11 connector, terminal
block
Wiring Type Unshielded twisted pair
Maximum Data Rate 64Kbps
Data Bus External
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| DTE serial port | CN1 | Terminal block | CN3 |
| (25-pin connector) | | | |
|---------------------+---------+------------------+---------|
| RJ-11 connector | CN2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|-----------------------------------------+-------+----------|
| í 64Kbps connection speed enabled | SW2/4 | Off |
|-----------------------------------------+-------+----------|
| 56Kbps connection speed enabled | SW2/4 | On |
|-----------------------------------------+-------+----------|
| í Asynchronous stop bit shortening set | SW2/5 | Off |
| to 25% | | |
|-----------------------------------------+-------+----------|
| Asynchronous stop bit shortening set to | SW2/5 | On |
| 12.5% | | |
|-----------------------------------------+-------+----------|
| í Carrier forced high | SW3/2 | On |
|-----------------------------------------+-------+----------|
| Carrier follows RTS signal | SW3/2 | Off |
|-----------------------------------------+-------+----------|
| í DTE control of analog loop disabled | SW3/3 | Off |
|-----------------------------------------+-------+----------|
| DTE control of analog loop enabled | SW3/3 | On |
|-----------------------------------------+-------+----------|
| í DTE control of remote digital loop | SW3/4 | Off |
| disabled | | |
|-----------------------------------------+-------+----------|
| DTE control of remote digital loop | SW3/4 | On |
| enabled | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOOPBACK TEST SELECTOR |
|------------------------------------------------------------|
| Function | SW1 |
|------------------------------------------+-----------------|
| Activates local analog loopback | 1 |
|------------------------------------------+-----------------|
| Normal operation. Loopback not activated | 2 |
|------------------------------------------+-----------------|
| Remote digital loopback initiated | 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT CLOCK SOURCE |
|------------------------------------------------------------|
| Source | SW2/1 | SW2/2 | SW2/3 |
|------------------------------------+-------+-------+-------|
| í Transmit clock generated | Off | Off | Off |
| internally | | | |
|------------------------------------+-------+-------+-------|
| Transmit clock derived from | Off | Off | On |
| receive line signal | | | |
|------------------------------------+-------+-------+-------|
| Transmit clock derived from | On | Off | Off |
| terminal interface | | | |
|------------------------------------+-------+-------+-------|
| Asynchronous mode enabled | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHARACTER LENGTH (ASYNC MODE) |
|------------------------------------------------------------|
| Setting | SW2/6 | SW3/1 |
|---------------------------------+------------+-------------|
| 8 bits | Off | Off |
|---------------------------------+------------+-------------|
| 9 bits | Off | On |
|---------------------------------+------------+-------------|
| í 10 bits | On | Off |
|---------------------------------+------------+-------------|
| 11 bits | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+--------+--------+------------------------------------|
| PWR | Green | On | Power is on |
|-----+--------+--------+------------------------------------|
| PWR | Green | Off | Power is off |
|-----+--------+--------+------------------------------------|
| TST | Red | On | Device is conducting a loopback |
| | | | test |
|-----+--------+--------+------------------------------------|
| TST | Red | Off | Device is not conducting a |
| | | | loopback test |
|-----+--------+--------+------------------------------------|
| CD | Yellow | On | Carrier signal high |
|-----+--------+--------+------------------------------------|
| CD | Yellow | Off | Carrier signal low |
|-----+--------+--------+------------------------------------|
| TD | Yellow | On | Device is transmitting data |
|-----+--------+--------+------------------------------------|
| TD | Yellow | Off | Device is not transmitting data |
+------------------------------------------------------------+