VARMODEM 2400 modem/telephone/ISDN Settings and Configuration
U.S. ROBOTICS, INC.
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.
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