VARMODEM 1200 modem/telephone/ISDN Settings and Configuration
U.S. ROBOTICS, INC.
VARMODEM 1200
Modem Type | Data (synchronous/asynchronous) |
Maximum Data Rate | 1200bps |
Data Bus | 8-bit ISA |
Data Modulation Protocol | Bell 103A/212A ITU-T V.21, V.22 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Line out | CN1 | Volume | R1 |
Line in | CN2 | ||
MULTI-LINE INSTALLATION | |
| Setting | J1 |
| » Single modem | Off |
| Multi-line | On |
TRANSMISSION FORMAT | |
| Setting | J2 |
| » 10-bit | Off |
| 11-bit | On |
RESET | |
| Setting | J14 |
| » Enabled | Off |
| Disabled | N/A |
FACTORY CONFIGURED SETTINGS | |
Jumper | Setting |
J3 | On |
BASE I/O ADDRESS SELECTION | ||
Port | J10 | J11 |
COM1: (3F8h) | Pins 2 & 3 closed | Off |
COM2: (2F8h) | Pins 2 & 3 closed | On |
COM3: (3E8h) | Pins 1 & 2 closed | Off |
COM4: (2E8h) | Pins 1 & 2 closed | ON |
INTERRUPT SELECTION | |
IRQ | J12 |
3 | Pins 2 & 3 closed |
4 | Pins 1 & 2 closed |
AUTO ANSWER | |
| Setting | SW1/1 |
| » Off | Modem answers on first ring |
| On | Modem does not answer on first ring |
CARRIER DETECT | |
| Setting | SW1/2 |
| » Off | CD normal |
| On | CD forced high |
PBX MODE | |
| Setting | SW1/3 |
| » Off | Normal dial up line equalization |
| On | PBX operation |
DTR SIGNAL | |
| Setting | SW1/4 |
| » Off | DTR normal |
| On | DTR forced high |
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