AT&T PARADYNE ============= DATAPORT EXPRESS 3740 Modem Type Data (synchronous/asynchronous)/Fax Maximum Data Rate 28.8Kbps Maximum Fax Rate 14.4Kbps Data Bus External Fax Class Class I & II Data Modulation Bell 103A/212A Protocol ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 Rockwell V.FC Fax Modulation ITU-T V.17, V.27ter, V.29 Protocol Error MNP5, V.42, V.42bis Correction/Compression +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |------------------+----------+-------------------+----------| | Line out | CN1 | DC power | CN4 | |------------------+----------+-------------------+----------| | Line in | CN2 | Power switch | SW1 | |------------------+----------+-------------------+----------| | RS-232/422 | CN3 | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | DIAGNOSTIC LED(S) | |------------------------------------------------------------| | LED | Color | Status | Condition | |-----+-------+--------+-------------------------------------| | TST | Red | On | Modem test executing | |-----+-------+--------+-------------------------------------| | TST | Red | Off | Normal operation | |-----+-------+--------+-------------------------------------| | HS | Red | On | Modem is operating at highest | | | | | configured rate | |-----+-------+--------+-------------------------------------| | HS | Red | Off | Modem is operating at less than | | | | | highest rate | |-----+-------+--------+-------------------------------------| | EC | Red | On | Error correction activated | |-----+-------+--------+-------------------------------------| | EC | Red | Off | Error correction not activated | |-----+-------+--------+-------------------------------------| | CD | Red | On | Carrier signal detected | |-----+-------+--------+-------------------------------------| | CD | Red | Off | Carrier signal not detected | |-----+-------+--------+-------------------------------------| | OH | Red | On | Modem is off-hook | |-----+-------+--------+-------------------------------------| | OH | Red | Off | Modem is on-hook | |-----+-------+--------+-------------------------------------| | RD | Red | On | Modem is receiving data | |-----+-------+--------+-------------------------------------| | RD | Red | Off | Modem is not receiving data | |-----+-------+--------+-------------------------------------| | SD | Red | On | Modem is transmitting data | |-----+-------+--------+-------------------------------------| | SD | Red | Off | Modem is not transmitting data | |-----+-------+--------+-------------------------------------| | TR | Red | On | DTR signal is high | |-----+-------+--------+-------------------------------------| | TR | Red | Off | DTR signal is low | |-----+-------+--------+-------------------------------------| | MR | Red | On | Power is on | |-----+-------+--------+-------------------------------------| | MR | Red | Off | Power is off | +------------------------------------------------------------+ Proprietary AT Command Set +------------------------------------------------------------+ | AUTO BAUD | |------------------------------------------------------------| | Type: | Register | |--------------+---------------------------------------------| | Format: | AT [cmds] S78=n [cmds] | |--------------+---------------------------------------------| | Example: | AT S78=0 &W | |--------------+---------------------------------------------| | Description: | Allows modem to connect at remote modem's | | | modulation. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> S78=0 | Auto baud enabled. | |--------------+---------------------------------------------| | S78=1 | Auto baud disabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | AUTO-RELIABLE TIME BUFFER CONFIGURATION | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Cn [cmds] | |--------------+---------------------------------------------| | Example: | AT \C1 &W | |--------------+---------------------------------------------| | Description: | Controls the handling of incoming data | | | during auto-reliable time period. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> \CO | Data is discarded. | |--------------+---------------------------------------------| | \C1 | Data is buffered. | |--------------+---------------------------------------------| | \C2 | Data is discarded, resets to \C1 on receipt | | | of autoreliable fallback character. | +------------------------------------------------------------+ +------------------------------------------------------------+ | AUTO-RELIABLE FALLBACK CHARACTER | |------------------------------------------------------------| | Type: | Register | |--------------+---------------------------------------------| | Format: | AT [cmds] %An [cmds] | |--------------+---------------------------------------------| | Example: | AT%A20 | |--------------+---------------------------------------------| | Default: | 19 | |--------------+---------------------------------------------| | Range: | 0-127 | |--------------+---------------------------------------------| | Unit: | ASCII | |--------------+---------------------------------------------| | Description: | Sets the character used as the | | | auto-reliable fallback character. %A0 will | | | disable this function. | +------------------------------------------------------------+ +------------------------------------------------------------+ | BAUD RATE ADJUST | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Jn [cmds] | |--------------+---------------------------------------------| | Example: | AT &B0 \J0 | |--------------+---------------------------------------------| | Description: | Allows baud rate to follow serial port | | | speed | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> \J0 | Baud rate adjust disabled. | |--------------+---------------------------------------------| | \J1 | Baud rate adjust enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | BREAK SEND | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Bn [cmds] | |--------------+---------------------------------------------| | Example: | AT \B3 &W | |--------------+---------------------------------------------| | Range: | 1-25 | |--------------+---------------------------------------------| | Default | 3 | |--------------+---------------------------------------------| | Unit: | .1 second | |--------------+---------------------------------------------| | Description: | Sends break to modem. | +------------------------------------------------------------+ +------------------------------------------------------------+ | BREAK TYPE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Kn [cmds] | |--------------+---------------------------------------------| | Example: | AT \K5 &W | |--------------+---------------------------------------------| | Description: | Selects response to DTE break command. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | \K0 | Send break, clear buffer, enter command | | | mode. | |--------------+---------------------------------------------| | \K1 | Send break, clear buffer | |--------------+---------------------------------------------| | \K2 | Send break, send data, enter command mode. | |--------------+---------------------------------------------| | \K3 | Send break. send data, | |--------------+---------------------------------------------| | \K4 | Send data, send break, enter command mode. | |--------------+---------------------------------------------| |>> \K5 | Send data, send break. | +------------------------------------------------------------+ +------------------------------------------------------------+ | COMPRESSION | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT %Cn | |--------------+---------------------------------------------| | Example: | AT &B0 %C1 &I2 | |--------------+---------------------------------------------| | Description: | Selects data compression. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | %C0 | Data compression disabled. | |--------------+---------------------------------------------| |>> %C1 | Data compression enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CONNECT MODE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Nn [cmds] | |--------------+---------------------------------------------| | Example: | AT \N1 DT555-1212 | |--------------+---------------------------------------------| | Description: | Sets connect mode. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | \N0 | Normal mode enabled. | |--------------+---------------------------------------------| | \N1 | Direct mode enabled. | |--------------+---------------------------------------------| | \N2 | MNP mode only enabled. | |--------------+---------------------------------------------| | \N3 | MNP mode with fallback to normal mode | | | enabled. | |--------------+---------------------------------------------| | \N4 | V.42 mode only enabled. | |--------------+---------------------------------------------| | \N5 | V.42 mode with fallback to normal mode | | | enabled. | |--------------+---------------------------------------------| | \N6 | V.42/MNP mode only enabled. | |--------------+---------------------------------------------| |>> \N6 | V.42 mode with fallback to normal mode | | | enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CTS SIGNAL | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Dn [cmds] | |--------------+---------------------------------------------| | Example: | AT \D0 | |--------------+---------------------------------------------| | Description: | Selects the function of the CTS signal. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | \D0 | CTS forced high. | |--------------+---------------------------------------------| |>> \D1 | CTS follows DTR. | +------------------------------------------------------------+ +------------------------------------------------------------+ | ECHO DATA | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \En [cmds] | |--------------+---------------------------------------------| | \Example: | AT \E0 | |--------------+---------------------------------------------| | Description: | Enables modem to echo received data. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | \E0 | Data echo disabled. | |--------------+---------------------------------------------| |>> \E1 | Data echo enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | FLOW CONTROL | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Gn [cmds] | |--------------+---------------------------------------------| | Example: | AT \G1 &K3 | |--------------+---------------------------------------------| | Description: | Selects modem port flow control. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> \G0 | Flow control disabled. | |--------------+---------------------------------------------| | \G1 | Flow control enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | FLOW CONTROL TYPE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Qn [cmds] | |--------------+---------------------------------------------| | Example: | AT \Q5 | |--------------+---------------------------------------------| | Description: | Sets type of flow control used by modem. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | \Q0 | Flow control disabled. | |--------------+---------------------------------------------| | \Q1 | Bidirectional XON/XOFF flow control | | | enabled. | |--------------+---------------------------------------------| | \Q2 | CTS flow control by DCE enabled. | |--------------+---------------------------------------------| |>> \Q3 | Bidirectional CTS/RTS flow control enabled. | |--------------+---------------------------------------------| | \Q4 | XON/XOFF flow control by DCE enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | HELP SCREENS | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT %H | |--------------+---------------------------------------------| | Example: | AT %H | |--------------+---------------------------------------------| | Description: | Displays list of AT commands and their | | | descriptions | +------------------------------------------------------------+ +------------------------------------------------------------+ | INACTIVITY TIMER | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Tn [cmds] | |--------------+---------------------------------------------| | Example: | AT\T20 | |--------------+---------------------------------------------| | Default: | 0 | |--------------+---------------------------------------------| | Range: | 0-255 | |--------------+---------------------------------------------| | Unit: | 1 minute | |--------------+---------------------------------------------| | Description: | Sets the length of time that the modem does | | | not receive information before it | | | disconnects. | +------------------------------------------------------------+ +------------------------------------------------------------+ | LAP-M FRAME SIZE | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \An [cmds] | |--------------+---------------------------------------------| | Example: | AT \A3 %C1 | |--------------+---------------------------------------------| | Description: | Sets the maximum number of characters per | | | frame of data. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | \A0 | Maximum frame size is 64 | |--------------+---------------------------------------------| | \A1 | Maximum frame size is 128 | |--------------+---------------------------------------------| | \A2 | Maximum frame size is 192 | |--------------+---------------------------------------------| |>> \A3 | Maximum frame size is 256 | +------------------------------------------------------------+ +------------------------------------------------------------+ | MODE SELECTION | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] +FCLASS=n | |--------------+---------------------------------------------| | Example: | AT +FCLASS=8 | |--------------+---------------------------------------------| | Description: | Sets what mode the modem will operate in. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | +FCLASS=0 | Data mode. | |--------------+---------------------------------------------| | +FCLASS=1 | Class 1 fax mode. | |--------------+---------------------------------------------| | +FCLASS=2 | Class 2 fax mode. | |--------------+---------------------------------------------| | +FCLASS? | Displays current setting | +------------------------------------------------------------+ +------------------------------------------------------------+ | MODULATION SELECT | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] %Mn [cmds] | |--------------+---------------------------------------------| | Example: | AT %M0 &W | |--------------+---------------------------------------------| | Description: | Selects whether V.34 or V.FC is used at | | | 28.8Kbps | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> %M0 | V.34 and V.FC enabled. | |--------------+---------------------------------------------| | %M1 | V.34 only enabled. | |--------------+---------------------------------------------| | %M2 | V.FC only enabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | PROTOCOL/SPEED | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] %Bn [cmds] | |--------------+---------------------------------------------| | Example: | AT %B14400 | |--------------+---------------------------------------------| | Description: | Selects the current DCE speed. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | %B300 | Select V.21 or Bell103 at 300bps speed. | |--------------+---------------------------------------------| | %B1200 | Select V.22,V.23 or Bell 212A at 1200bps | | | speed. | |--------------+---------------------------------------------| | %B2400 | Select V.22 at 2400bps speed. | |--------------+---------------------------------------------| | %B4800 | Select V.34 at 4800bps speed. | |--------------+---------------------------------------------| | %B7200 | Select V.34 at 7200bps speed. | |--------------+---------------------------------------------| | %B9600 | Select V.34 at 9600bps uncoded speed. | |--------------+---------------------------------------------| | %B12000 | Select V.34 at 12Kbps speed. | |--------------+---------------------------------------------| | %B14400 | Select V.34 at 14.4Kbps speed. | |--------------+---------------------------------------------| | %B16800 | Select V.34 at 16.8Kbps speed. | |--------------+---------------------------------------------| | %B19200 | Select V.34 at 19.2Kbps speed. | |--------------+---------------------------------------------| | %B21600 | Select V.34 at 21.6Kbps speed. | |--------------+---------------------------------------------| | %B24000 | Select V.34 at 24Kbps speed. | |--------------+---------------------------------------------| | %B26400 | Select V.34 at 26.4Kbps speed. | |--------------+---------------------------------------------| |>> %B28800 | Select V.34 at 28.8Kbps speed. | |--------------+---------------------------------------------| | %BL2400 | Select V.22bis at 2400Kbps speed. | |--------------+---------------------------------------------| | %BL4800 | Select V.32bis/V.32 at 4800Kbps speed. | |--------------+---------------------------------------------| | %BL7200 | Select V.32bis at 7200Kbps speed. | |--------------+---------------------------------------------| | %BL9600 | Select V.32bis/V.32 at 9600Kbps speed. | |--------------+---------------------------------------------| | %BL12000 | Select V.32bis at 12Kbps speed. | |--------------+---------------------------------------------| | %BL14400 | Select V.32bis at 14.4Kbps speed. | +------------------------------------------------------------+ +------------------------------------------------------------+ | V.32bis AUTO-RETRAIN | |------------------------------------------------------------| | Type: | Register | |--------------+---------------------------------------------| | Format: | AT [cmds] S76=n [cmds] | |--------------+---------------------------------------------| | Example: | AT S76=0 &W | |--------------+---------------------------------------------| | Description: | Selects action the modem will take during | | | bad line quality on 32bis connection. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> S76=0 | Auto retrain enabled. | |--------------+---------------------------------------------| | S76=1 | Auto retrain disabled. | +------------------------------------------------------------+ +------------------------------------------------------------+ | XON/XOFF PASS-THROUGH | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] \Xn [cmds] | |--------------+---------------------------------------------| | Example: | AT \X7 O | |--------------+---------------------------------------------| | Description: | Selects whether XON/XOFF signals are sent | | | to remote modem. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| |>> \X0 | XON/XOFF signals trapped by local modem. | |--------------+---------------------------------------------| | \X1 | XON/XOFF passed through local modem. | +------------------------------------------------------------+