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 |
|
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.