(TXT) View Source
# 3COM CORPORATION
VARMODEM 2400
Modem Type Data (synchronous/asynchronous)
Maximum Data Rate 2400bps
Data Bus 8-bit ISA
Data Modulation Protocol Bell 103A/212A
ITU-T V.21, V.22, V.22bis, V.23
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Line out | CN1 | Volume | SW2 |
|-------------------+----------+------------------+----------|
| Line in | CN2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
| Port | J3 | J4 |
|--------------------+------------------+--------------------|
| » COM1: (3F8h) | Off | Pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| COM2: (2F8h) | On | Pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| COM3: (3E8h) | Off | Pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| COM4: (2E8h) | On | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | J5 |
|----------------------------+-------------------------------|
| » 4 | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR SIGNAL |
|------------------------------------------------------------|
| Setting | SW1/1 |
|----------------------------+-------------------------------|
| » On | DTR forced high |
|----------------------------+-------------------------------|
| Off | DTR normal |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Setting | SW1/2 |
|----------------------------+-------------------------------|
| » Off | Verbal result codes enabled |
|----------------------------+-------------------------------|
| On | Numeric result codes enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES DISPLAY |
|------------------------------------------------------------|
| Setting | SW1/3 |
|----------------------------+-------------------------------|
| Off | Display disabled |
|----------------------------+-------------------------------|
| » On | Display enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ECHO COMMANDS DISPLAY |
|------------------------------------------------------------|
| Setting | SW1/4 |
|----------------------------+-------------------------------|
| » Off | Local echo enabled |
|----------------------------+-------------------------------|
| On | Local echo disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO ANSWER |
|------------------------------------------------------------|
| Setting | SW1/5 |
|----------------------+-------------------------------------|
| » On | Modem does not answer on first ring |
|----------------------+-------------------------------------|
| Off | Modem answers on first ring |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CARRIER DETECT |
|------------------------------------------------------------|
| Setting | SW1/6 |
|----------------------------+-------------------------------|
| » Off | CD normal |
|----------------------------+-------------------------------|
| On | CD forced high |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MULTI-LINE INSTALLATION |
|------------------------------------------------------------|
| Setting | SW1/7 |
|----------------------------+-------------------------------|
| » Off | Single phone connected |
|----------------------------+-------------------------------|
| On | Multiple phones connected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AT COMMAND SET |
|------------------------------------------------------------|
| Setting | SW1/8 |
|----------------------------+-------------------------------|
| » On | AT command set recognized |
|----------------------------+-------------------------------|
| Off | AT command set disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ESCAPE CODE |
|------------------------------------------------------------|
| Setting | SW1/9 |
|---------+--------------------------------------------------|
| » On | Go to command mode and display OK result code |
| | when escape character is received |
|---------+--------------------------------------------------|
| Off | Disconnect, go to command mode and display NO |
| | CARRIER when escape character is received |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOLUME CONTROL |
|------------------------------------------------------------|
| Setting | SW1/10 |
|----------------------------+-------------------------------|
| » Off | High volume |
|----------------------------+-------------------------------|
| On | Low volume |
+------------------------------------------------------------+
Proprietary AT Command Set
See document V1254 for a full command summary.