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# 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
(IMG) IMG 1
+------------------------------------------------------------+
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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 <CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| Description: | Displays list of AT commands and their |
| | descriptions |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Tn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT\T20<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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<CR> |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+