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# RAD DATA COMMUNICATIONS
ASM-24 (REV. 1)
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/V.35/X.21 | 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 | JP5 |
|----------------------------+-------------------------------|
| » Enabled | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BAUD RATE |
|------------------------------------------------------------|
| Setting | SW12 |
|-------------------------------+----------------------------|
| 144Kbps | 0 |
|-------------------------------+----------------------------|
| 128Kbps | 1 |
|-------------------------------+----------------------------|
| 112Kbps | 2 |
|-------------------------------+----------------------------|
| 96Kbps | 3 |
|-------------------------------+----------------------------|
| 72Kbps | 4 |
|-------------------------------+----------------------------|
| » 64Kbps | 5 |
|-------------------------------+----------------------------|
| 56Kbps | 6 |
|-------------------------------+----------------------------|
| 48Kbps | 7 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD SENSITIVITY |
|------------------------------------------------------------|
| Setting | JP10 |
|----------------------------+-------------------------------|
| » High | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Low | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD SIGNAL |
|------------------------------------------------------------|
| Setting | JP6 |
|-----------------------------+------------------------------|
| » CD forced high | Pins 1 & 2 closed |
|-----------------------------+------------------------------|
| CD normal | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHASSIS TO SIGNAL GROUND |
|------------------------------------------------------------|
| Setting | JP3 |
|----------------------------+-------------------------------|
| » Connected | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| Disconnected | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK SOURCE |
|------------------------------------------------------------|
| Setting | JP11/A | JP11/B | JP11/C |
|---------------+--------------+--------------+--------------|
| Receive | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| » Internal | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| External | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ENABLE PUSHBUTTONS |
|------------------------------------------------------------|
| Setting | JP8 |
|----------------------------+-------------------------------|
| » On | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Off | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RECEIVE IMPEDANCE |
|------------------------------------------------------------|
| Setting | JP2 |
|----------------------------+-------------------------------|
| » 150omhs | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| High | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RECEIVE LEVEL |
|------------------------------------------------------------|
| Setting | JP14 |
|----------------------------+-------------------------------|
| » 0dBm | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| -6dBm | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REMOTE LOOPBACK |
|------------------------------------------------------------|
| Setting | JP4 |
|----------------------------+-------------------------------|
| » Enabled | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RTS/CTS DELAY |
|------------------------------------------------------------|
| Setting | JP7 |
|----------------------------+-------------------------------|
| » 8ms | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 70ms | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT IMPEDANCE |
|------------------------------------------------------------|
| Setting | JP1 |
|----------------------------+-------------------------------|
| » 150omhs | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Low | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT LEVEL |
|------------------------------------------------------------|
| Setting | JP13 |
|----------------------------+-------------------------------|
| » 0dBm | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| -6dBm | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.54 DELAY |
|------------------------------------------------------------|
| Setting | JP9 |
|----------------------------+-------------------------------|
| » 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 | Green | On | Request to Send enabled |
|------+--------+----------+---------------------------------|
| RTS | Green | 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 |
+------------------------------------------------------------+