UNIDENTIFIED ============ 2400BS MODEM Card Type Modem (asynchronous) Chip Set Unidentified Maximum Data Rate 2400bps Data Bus 8-bit ISA Data Modulation Protocol Bell 103/212A ITU-T V.21, V.22, V.22bis +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Function | Label | Function | Label | |------------------------------------------------------------| | Line in | CN1 | Volume | R1 | |-----------------------------+------------+----------+------| | Line out | CN2 | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | SERIAL PORT ADDRESS AND INTERRUPT | |------------------------------------------------------------| | Setting | Setting | SW1/1 | SW1/2 | |---------------+---------------+--------------+-------------| | COM1 (3F8h) | IRQ 4 | On | On | |---------------+---------------+--------------+-------------| | COM2 (2F8h) | IRQ 3 | Off | On | |---------------+---------------+--------------+-------------| | COM3 (3E8h) | IRQ 4 | On | Off | |---------------+---------------+--------------+-------------| | COM4 (2E8h) | IRQ 3 | Off | Off | +------------------------------------------------------------+ Proprietary AT Command Set +------------------------------------------------------------+ | BIT-MAPPED REGISTER S14 | |------------------------------------------------------------| | Format | AT [cmds] S14=n [cmds] | |--------------+---------------------------------------------| | Default: | 170 | |--------------+---------------------------------------------| | Range: | 0-174 | |--------------+---------------------------------------------| | Unit: | Bit-mapped | |--------------+---------------------------------------------| | Description: | Controls echo, result codes and display, | | | dial mode, and answer/originate mode. | |--------------+---------------------------------------------| | Bit | Value | Function | |------+-------+---------------------------------------------| | 0 | 0 | Not used | |------+-------+---------------------------------------------| | 1 | 0 | Command echo disabled | | | | | | | i 1 | Command echo enabled | |------+-------+---------------------------------------------| | 2 | i 0 | Result codes enabled | | | | | | | 1 | Result codes disabled | |------+-------+---------------------------------------------| | 3 | 0 | Display result codes in numeric format | | | | | | | i 1 | Display result codes in verbose format | |------+-------+---------------------------------------------| | 4 | 0 | Not used | |------+-------+---------------------------------------------| | 5 | 0 | Tone dial enabled | | | | | | | i 1 | Pulse dial enabled | |------+-------+---------------------------------------------| | 6 | 0 | Not used | |------+-------+---------------------------------------------| | 7 | 0 | Answer mode enabled | | | | | | | i 1 | Originate mode enabled | +------------------------------------------------------------+ +------------------------------------------------------------+ | BIT-MAPPED REGISTER S21 | |------------------------------------------------------------| | Format | AT [cmds] S21=n [cmds] | |--------------+---------------------------------------------| | Default: | 48 | |--------------+---------------------------------------------| | Range: | 0-252 | |--------------+---------------------------------------------| | Unit: | Bit-mapped | |--------------+---------------------------------------------| | Description: | Selects CTS/DCD/DSR signals, low DTR | | | action, and the long space disconnect | | | function. | |--------------+---------------------------------------------| | Bit | Value | Function | |------+-------+---------------------------------------------| | 1, 0 | 0 | Not used | |------+-------+---------------------------------------------| | 2 | i 0 | CTS follows RTS | | | | | | | 1 | CTS forced high | |------+-------+---------------------------------------------| | 4, 3 | 00 | DTR signal ignored | | | | | | | 01 | Modem goes to command mode on low DTR | | | | | | | i 10 | Modem disconnects on low DTR; Auto-Answer | | | | is disabled. | | | 11 | | | | | Modem is initialized on low DTR | |------+-------+---------------------------------------------| | 5 | 0 | DCD forced high | | | | | | | i 1 | DCD normal | |------+-------+---------------------------------------------| | 6 | i 0 | DSR forced high | | | | | | | 1 | DSR normal | |------+-------+---------------------------------------------| | 7 | i 0 | Long space disconnect function disabled | | | | | | | 1 | Long space disconnect function enabled | +------------------------------------------------------------+ +------------------------------------------------------------+ | BIT-MAPPED REGISTER S22 | |------------------------------------------------------------| | Format | AT [cmds] S22=n [cmds] | |--------------+---------------------------------------------| | Default: | 118 | |--------------+---------------------------------------------| | Range: | 0-255 | |--------------+---------------------------------------------| | Unit: | Bit-mapped | |--------------+---------------------------------------------| | Description: | Controls speaker volume and controls, | | | limits results codes, and make/break ratio. | |--------------+---------------------------------------------| | Bit | Value | Function | |------+-------+---------------------------------------------| | 1, 0 | 00 | Off volume | | | | | | | 01 | Low level volume | | | | | | | i 10 | Medium level volume | | | | | | | 11 | High level volume | |------+-------+---------------------------------------------| | 3, 2 | 00 | Speaker off | | | | | | | i 01 | Speaker off on carrier | | | | | | | 10 | Speaker always on | | | | | | | 11 | Speaker on during handshake | |------+-------+---------------------------------------------| | 6, | 000 | Basic result codes only enabled | | 5, 4 | | | | | 100 | Basic and connection speed result codes | | | | enabled | | | 101 | | | | | Basic and connection speed result codes and | | | 110 | dialtone detection enabled | | | | | | | i 111 | All result codes except dialtone detection | | | | enabled | | | | | | | | All result codes enabled | |------+-------+---------------------------------------------| | 7 | i 0 | 39/61ms at 10pps (North America) | | | | | | | 1 | 33/67ms at 10pps (Europe) | +------------------------------------------------------------+ +------------------------------------------------------------+ | BIT-MAPPED REGISTER S23 | |------------------------------------------------------------| | Format | AT [cmds] S23=n [cmds] | |--------------+---------------------------------------------| | Default: | 6 | |--------------+---------------------------------------------| | Range: | 0-183 | |--------------+---------------------------------------------| | Unit: | Bit-mapped | |--------------+---------------------------------------------| | Description: | Grants/denies remote digital loopback, | | | controls DTE rate and parity, and sets | | | guard tone. | |--------------+---------------------------------------------| | Bit | Value | Function | |------+-------+---------------------------------------------| | 0 | i 0 | Remote digital loopback denied | | | | | | | 1 | Remote digital loopback allowed | |------+-------+---------------------------------------------| | 2, 1 | 00 | Sets serial port speed to 0-300bps | | | | | | | 10 | Sets serial port speed to 1200bps | | | | | | | i 11 | Sets serial port speed to 2400bps | |------+-------+---------------------------------------------| | 3 | 0 | Not used | |------+-------+---------------------------------------------| | 5,4 | i 00 | Parity even | | | | | | | 01 | Space Parity | | | | | | | 10 | Parity odd | | | | | | | 11 | Mark Parity | |------+-------+---------------------------------------------| | 7, 6 | i 00 | Guard tone disabled | | | | | | | 01 | Guard tone 550Hz enabled | | | | | | | 10 | Guard tone 1800Hz enabled | +------------------------------------------------------------+ +------------------------------------------------------------+ | BIT-MAPPED REGISTER S27 | |------------------------------------------------------------| | Format | AT [cmds] S27=n [cmds] | |---------------+--------------------------------------------| | Default: | 64 | |---------------+--------------------------------------------| | Range: | 0-68 | |---------------+--------------------------------------------| | Unit: | Bit-mapped | |---------------+--------------------------------------------| | Description: | Selects line type, and ITU-T/Bell modes. | |---------------+--------------------------------------------| | Bit | Value | Function | |-------+-------+--------------------------------------------| | 1, 0 | 0 | Not used | |-------+-------+--------------------------------------------| | 2 | i 0 | Switched line | | | | | | | 1 | Leased line | |-------+-------+--------------------------------------------| | 5 - 3 | 0 | Not used | |-------+-------+--------------------------------------------| | 6 | 0 | ITU/T mode | | | | | | | i 1 | Bell mode | +------------------------------------------------------------+ +------------------------------------------------------------+ | TEST MODES | |------------------------------------------------------------| | Format | AT [cmds] S16=n [cmds] | |--------------+---------------------------------------------| | Default: | 0 | |--------------+---------------------------------------------| | Range: | 0-125 | |--------------+---------------------------------------------| | Unit: | Bit-mapped | |--------------+---------------------------------------------| | Description: | Controls loopback tests, analog, digital, | | | remote digital, and self tests. | |--------------+---------------------------------------------| | Bit | Value | Function | |------+-------+---------------------------------------------| | 0 | i 0 | Local analog loopback not in progress | | | | | | | 1 | Local analog loopback in progress | |------+-------+---------------------------------------------| | 1 | 0 | Not used | |------+-------+---------------------------------------------| | 2 | i 0 | Local digital loopback not in progress | | | | | | | 1 | Local digital loopback in progress | |------+-------+---------------------------------------------| | 3 | i 0 | Modem not in remote digital loopback | | | | | | | 1 | Remote digital loopback in progress | |------+-------+---------------------------------------------| | 4 | i 0 | Remote digital loopback not requested | | | | | | | 1 | Remote digital loopback requested | |------+-------+---------------------------------------------| | 5 | i 0 | Remote digital loopback w/ self-test not in | | | | progress | | | 1 | | | | | Remote digital loopback w/ self-test in | | | | progress | |------+-------+---------------------------------------------| | 6 | i 0 | Local analog loopback w/ self-test not in | | | | progress | | | 1 | | | | | Local analog loopback w/ self-test in | | | | progress | +------------------------------------------------------------+