(TXT) View Source
# RAD DATA COMMUNICATIONS
ASM-20 V.24 AND X.21
Modem Type Data (Synchronous)
Maximum Data Rate 144Kbps
Data Bus External
Data Modulation Protocol Proprietary
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| V.24/X.21/RS-530 | CN1 | Diagnostic test | DIG |
| | | switch | |
|------------------+----------+-------------------+----------|
| AC power | CN2 | Analog loopback | ANA |
| | | switch | |
|------------------+----------+-------------------+----------|
| Ground | GND | Remote loopback | REM |
| | | switch | |
|------------------+----------+-------------------+----------|
| Receive | RCV | Test pattern | PATT |
|------------------+----------+-------------------+----------|
| Transmit | XMT | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ANALOG LOOPBACK |
|------------------------------------------------------------|
| Setting | JP7 |
|----------------------------+-------------------------------|
| » Enabled | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BAUD RATE |
|------------------------------------------------------------|
| Setting | SW1 |
|-----------------------------------+------------------------|
| 128Kbps | 0 |
|-----------------------------------+------------------------|
| 112Kbps/144Kbps | 1 |
|-----------------------------------+------------------------|
| » 64Kbps | 2 |
|-----------------------------------+------------------------|
| 56Kbps/72Kbps | 3 |
|-----------------------------------+------------------------|
| 48Kbps | 4 |
|-----------------------------------+------------------------|
| 32Kbps | 5 |
|------------------------------------------------------------|
| Note: With the V.24 connector the highest rate is 64Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD SIGNAL |
|------------------------------------------------------------|
| Setting | JP3 |
|-----------------------------+------------------------------|
| CD normal | Pins 1 & 2 closed |
|-----------------------------+------------------------------|
| » CD forced high | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHASSIS TO SIGNAL GROUND |
|------------------------------------------------------------|
| Setting | JP10 |
|----------------------------+-------------------------------|
| » Connected | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| Disconnected | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK SOURCE |
|------------------------------------------------------------|
| Setting | JP1/A | JP1/B | JP1/C |
|---------------+--------------+--------------+--------------|
| » Internal | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| External | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| Receive | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ENABLE PUSHBUTTONS |
|------------------------------------------------------------|
| Setting | JP9 |
|-------------------------------+----------------------------|
| » DIG, ANA, REM, PATT enabled | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RECEIVE IMPEDANCE |
|------------------------------------------------------------|
| Setting | JP6 |
|----------------------------+-------------------------------|
| » 135omhs | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Low | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REMOTE LOOPBACK |
|------------------------------------------------------------|
| Setting | JP8 |
|----------------------------+-------------------------------|
| » Enabled | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| Disabled | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REMOTE POWER FAILURE |
|------------------------------------------------------------|
| Setting | JP12 |
|-------------------------------+----------------------------|
| » Transmit RPF tone | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Doesn’t transmit RPF tone | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RTS/CTS DELAY |
|------------------------------------------------------------|
| Setting | JP2/A | JP2/B | JP2/C |
|---------------+--------------+--------------+--------------|
| 0ms | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| » 9ms | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 70ms | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT IMPEDANCE |
|------------------------------------------------------------|
| Setting | JP5 |
|----------------------------+-------------------------------|
| » 135omhs | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Low | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT LEVEL |
|------------------------------------------------------------|
| Setting | JP4 |
|----------------------------+-------------------------------|
| » 0dBm | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| -6dBm | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.54 DELAY |
|------------------------------------------------------------|
| Setting | JP11 |
|----------------------------+-------------------------------|
| » On | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Off | Pins 2 & 3 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 |
|------+--------+----------+---------------------------------|
| ERR | Yellow | On | Errors in test pattern |
|------+--------+----------+---------------------------------|
| ERR | Yellow | Off | Good test pattern |
+------------------------------------------------------------+