MICROCOM, INC. DESKPORTE 28.8S Modem Type Data (synchronous/asynchronous)/Fax Maximum Data Rate 28.8Kbps Maximum Fax Rate Unidentified Data Bus External Fax Class Unidentified Data Modulation Protocol Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 Rockwell V.FC Fax Modulation Protocol Unidentified Error Correction/Compression MNP5, MNP10, V.42, V.42bis [Image] 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 AA Red On Auto-answer enabled AA Red Off Auto-answer disabled 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 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 TR Red On DTR signal is high TR Red Off DTR signal is low TM Red On Test mode enabled TM Red Off Test mode disabled TM Red Slow blink RAM test failed TM Red Medium blink ROM test failed TM Red Fast blink MDP(Data Pump) test failed Proprietary AT Command Set AUTO-RETRAIN - FALLBACK/FALLFORWARD Type: Configuration Format: AT [cmds] %En [cmds] Description: Controls auto-retrain mode and fallback/fall forward Command Function %E0 Auto-retrain disabled %E1 Auto-retrain enabled » %E2 Fallback/fall forward enabled %E3 Auto-retrain enabled, modem will hang up if EQM reaches hang up threshold BIT-MAPPED REGISTER S14 Format AT [cmds] S14=n [cmds] Default: 138 Range: 0-174 Unit: Bit-mapped Description: Controls echo, result codes, result code display, dial mode, and answer/originate mode Bit Value Function 0 0 Not used 1 0 Command echo disabled » 1 Command echo enabled 2 » 0 Result codes enabled 1 Result codes disabled 3 0 Display result codes in numeric format » 1 Display result codes in verbose format 4 0 Not used 5 » 0 Tone dial enabled 1 Pulse dial enabled 6 0 Not used 7 0 Answer mode enabled » 1 Originate mode enabled BIT-MAPPED REGISTER S21 Format AT [cmds] S21=n [cmds] Default: 0 Range: 0-248 Unit: Bit-mapped Description: Selects low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function Bit Value Function 2 - 0 0 Not used 4, 3 » 00 DTR signal ignored 01 Modem goes to command mode on low DTR 10 Modem disconnects on low DTR Auto-Answer is disabled 11 Modem is initialized on low DTR 5 » 0 DCD forced high 1 DCD normal 6 » 0 DSR forced high 1 DSR normal 7 » 0 Long Space Disconnect function disabled 1 Long Space Disconnect function enabled BIT-MAPPED REGISTER S22 Format AT [cmds] S22=n [cmds] Default: 117 Range: 0-127 Unit: Bit-mapped Description: Controls speaker volume and controls, and limits results codes Bit Value Function 1, 0 00 Off volume » 01 Low level volume 10 Medium level volume 11 High level volume 3, 2 00 Speaker off » 01 Speaker off on carrier 10 Speaker always on 11 Speaker on during handshake 6, 5, 4 000 Basic result codes only enabled 100 Basic and connection speed result codes enabled 101 Basic and connection speed result codes 110 and dialtone detection enabled » 111 All result codes except dialtone detection enabled All result codes enabled BIT-MAPPED REGISTER S23 Format AT [cmds] S23=n [cmds] Default: 55 Range: 0-189 Unit: Bit-mapped Description: Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone Bit Value Function 0 0 Remote digital loopback denied » 1 Remote digital loopback allowed 3, 2, 1 000 Sets serial port speed to 0-300bps 001 Sets serial port speed to 600bps 010 Sets serial port speed to 1200bps » 011 Sets serial port speed to 2400bps 100 Sets serial port speed to 4800bps 101 Sets serial port speed to 9600bps 110 Sets serial port speed to 19200bps 5,4 00 Parity even 01 Not used 10 Parity odd » 11 No Parity 7, 6 » 00 Guard tone disabled 01 Guard tone disabled 10 Guard tone 1800Hz enabled BIT-MAPPED REGISTER S27 Format AT [cmds] S27=n [cmds] Default: 73 Range: 0-73 Unit: Bit-mapped Description: Selects sync/async mode and ITU-T/Bell modes Bit Value Function 3, 1, 0 000 Asynchronous mode, serial port speed follows connect speed » 101 Error correction mode 5, 4, 2 0 Not used 6 0 CCITT mode » 1 Bell mode BIT-MAPPED REGISTER S28 Format AT [cmds] S28=n [cmds] Default: 0 Range: 0-128 Unit: Bit-mapped Description: Controls pulse dialing and MNP10 link negotiation Bit Value Function 2 - 0 0 Not used 4, 3 » 00 39ms make/61ms break at 10pps 5 0 Not used 7, 6 » 00 Link will be negotiated at highest possible speed 01 Link will be negotiated at 1200bps 10 Link will be negotiated at 4800bps BIT-MAPPED REGISTER S31 Format AT [cmds] S31=n [cmds] Default: 2 Range: 0-10 Unit: Bit-mapped Description: Controls auto-baud function and result codes Bit Value Function 0 0 Not used 1 0 Auto-baud disabled » 1 Auto-baud enabled 3, 2 » 00 DTE speed displayed in result codes 01 Extended result codes enabled; DCE speed displayed in result codes. 10 DCE speed displayed in result codes BIT-MAPPED REGISTER S40 Format AT [cmds] S40=n [cmds] Default: 105 Range: 0-239 Unit: Bit-mapped Description: Controls power level and break handling; selects MNP extended services, link negotiation, and block size Bit Value Function 1, 0 00 MNP10 disabled » 01 MNP10 enabled 10 MNP10 enabled on originate mode only 0 0 MNP10 disabled » 1 MNP10 enabled 1 0 MNP10 at 2400 and 1200bps disabled » 1 MNP10 at 2400 and 1200bps enabled 2 » 0 Power level adjustment disabled 1 Power level adjustment enabled 5, 4, 3 000 \K0 001 \K1 010 \K2 011 \K3 100 \K4 » 101 \K5 7, 6 00 MNP block size is 64 characters » 01 MNP block size is 128 characters 10 MNP block size is 192 characters 11 MNP block size is 256 characters BIT-MAPPED REGISTER S41 Format AT [cmds] S41=n [cmds] Default: 195 Range: 0-223 Unit: Bit-mapped Description: Selects compression, auto-retrain, flow control, MNP mode, and fallback-V.22/22bbis Bit Value Function 1 - 0 00 Data compression disabled 01 MNP5 enabled 10 V.42bis enabled » 11 MNP5 and V.42bis enabled 6, 2 00 Auto-retrain disabled 01 Auto-retrain enabled » 10 Fallback/fall forward enabled 11 Auto-retrain enabled, modem will hang up if EQM reaches hang up threshold 3 » 0 Flow control disabled 1 Flow control enabled 4 » 0 Stream mode for MNP 1 Block mode for MNP 5 0 Not used 7 0 MNP10 at 2400 and 1200bps disabled » 1 MNP10 at 2400 and 1200bps enabled BREAK SEND Type: Configuration Format: AT [cmds] \Bn [cmds] Default: 3 Range: 1-9 Unit: .1 second Description: Sends break to modem BREAK TYPE Type: Configuration Format: AT [cmds] \Kn [cmds] Description: Configures action of break signal Command Break from DTE Break from DTE Break from remote modem Reliable/Normal Direct mode mode \K0 Enter command Send break to Buffers cleared mode, do not send remote modem and break sent break to remote immediately, to DTE modem then enter command mode \K1 Buffers cleared Send break to Buffers cleared and break sent to remote modem and break sent remote modem immediately, to DTE then enter command mode \K2 Enter command Send break to Send break to mode, do not send remote modem DTE immediately break to remote immediately modem \K3 Send break to Send break to Send break to remote modem remote modem DTE immediately immediately immediately, then enter command mode \K4 Enter command Send break to Break sent with mode, do not send remote modem received data break to remote immediately to the DTE modem » \K5 Send break with Send break to Break sent with transmitted data remote modem received data immediately to the DTE CELLULAR TRANSMISSION LEVEL Type: Configuration Format: AT [cmds] @Mn [cmds] Default: 0 Range: 11-31 Unit: -1dBm Description: Sets the signal level for transmission Command Function @M0 -26dBm @M1 -30dBm @M2-@M10 -10dBm CELLULAR TRANSMISSION LEVEL Format AT [cmds] S201=n [cmds] Default: 58 Range: 0-63 Unit: Bit-mapped Description: Controls cellular transmission level and compromise equalizer Bit Value Function 4 - 0 00000 Sets cellular transmit level level to -26dBm 00001 Sets cellular transmit level level to -30dBm 00010 Sets cellular transmit level level to -10dBm ... ... 01010 Sets cellular transmit level level to -10dBm 01011 Sets cellular transmit level level to -11dBm ... ... » 11010 Sets cellular transmit level level to -26dBm ... ... 11111 Sets cellular transmit level level to -31dBm 5 0 Equalizer disabled » 1 Equalizer enabled CHANGE DIAL CODES Type: Configuration Format: AT [cmds] *Zn [cmds] Description: Selects dial codes, for International use Command Function *Z0 Enable dial code 0 *Z1 Enable dial code 1 COMPRESSION Type: Configuration Format: AT [cmds] %Cn [cmds] Description: Selects data compression Command Function %C0 Data compression disabled %C1 MNP5 enabled %C2 V.42bis enabled » %C3 MNP5 and V.42bis enabled COMPROMISE EQUALIZER Type: Configuration Format: AT [cmds] :En [cmds] Description: Controls V.32 compromise equalizer Command Function :E0 Equalizer disabled » :E1 Equalizer enabled CONNECT MODE Type: Configuration Format: AT [cmds] \Nn [cmds] Description: Sets connect mode Command Function \N0 Normal mode enabled \N1 Direct mode enabled \N2 Reliable mode enabled » \N3 Auto-reliable mode enabled \N4 LAPM mode enabled \N5 MNP mode enabled DIAL Type: Immediate Format: AT [cmds] D<#> [cmds] Description: Dials telephone number according to any modifiers included in the string Modifier Function J Link will be negotiated at 1200bps K Power level adjustment enabled L Redials last valid dial string P Pulse dialing enabled S=c Number in memory location c dialed T Tone dialing enabled W Dialing resumed following dial tone detection @ Modem waits for a ring-back signal followed by silence up to the time specified in S7 prior to executing the rest of the dial string. ! Flash function initiated Modem commanded to go on-hook for specified time ; Modem returned to command mode after dialing ^ Disable calling tone & Detect bong tone. Modem waits for time specified in S6 before returning NO DIALTONE. DISPLAY STORED NUMBERS Type: Immediate Format: AT [cmds] \F [cmds] Description: Displays all stored phone numbers FLOW CONTROL Type: Configuration Format: AT [cmds] \Gn [cmds] Description: Selects modem port flow control Command Function » \G0 Flow control disabled \G1 Flow control enabled FLOW CONTROL CHARACTER - XOFF Type: Register Format: AT [cmds] S33=n [cmds] Default: 19 Range: 0-255 Unit: ASCII Description: Sets the character used to represent XOFF. FLOW CONTROL CHARACTER - XON Type: Register Format: AT [cmds] S32=n [cmds] Default: 17 Range: 0-255 Unit: ASCII Description: Sets the character used to represent XON. LINE SIGNAL LEVEL Type: Immediate Format: AT [cmds] %L [cmds] Range: 9-43 Unit: -1dBm Description: Displays received line signal level MNP STREAM/BLOCK MODE Type: Configuration Format: AT [cmds] \Ln [cmds] Description: Selects the transfer mode for MNP Command Function » \L0 Stream mode for MNP enabled \L1 Block mode for MNP enabled MNP10 COMPRESSION Type: Configuration Format: AT [cmds] -Kn [cmds] Description: Selects MNP10 data compression Command Function -K0 MNP10 disabled » -K1 MNP10 enabled -K2 MNP10 enabled on originate mode only MAXIMUM BLOCK SIZE FOR TRANSMISSION Type: Configuration Format: AT [cmds] \An [cmds] Description: Sets the maximum transmittable block size Command Function \A0 MNP block size is 64 characters » \A1 MNP block size is 128 characters \A2 MNP block size is 192 characters \A3 MNP block size is 256 characters MNP10 FALL-BACK Type: Configuration Format: AT [cmds] -Qn [cmds] Description: Allows MNP10 to fall back to speeds slower than 4800bps Command Function -Q0 MNP10 at 2400 and 1200bps disabled » -Q1 MNP10 at 2400 and 1200bps enabled MNP10 LINK NEGOTIATION Type: Configuration Format: AT [cmds] *Hn [cmds] Description: Sets the speed at which MNP10 link negotiation will occur Command Function » *H0 Link will be negotiated at highest possible speed *H1 Link will be negotiated at 1200bps *H2 Link will be negotiated at 4800bps Note: *H2 not supported with )M1 MNP10 POWER LEVEL ADJUST Type: Configuration Format: AT [cmds] )Mn [cmds] Description: Controls automatic transmit power level adjustment during MNP 10 link negotiation Command Function » )M0 Power level adjustment disabled )M1 Power level adjustment enabled Note: )M1 not supported with *H2 MODULATION SELECTION DISPLAY Type: Immediate Format: AT [cmds] +MSUnidentified [cmds] Description: Displays modulation, automode, minimum rate and maximum rate settings MODULATION SELECTION Type: Configuration Format: AT [cmds] +MS=xx,y,zzz,aaa [cmds] Description: Sets options for active protocol. The transfer rates specified by z and a must be valid for the protocol selected Command Function x=0 V.21 x=1 V.22 x=2 V.22bis x=3 V.23 x=9 V.32 x=10 V.32bis » x=11 V.34 x=64 Bell 103A x=69 Bell 212A x=74 V.FC y=0 Automode disabled » y=1 Auto-detect highest speed enabled » z, a=300 Set minimum or maximum transfer rate at 300bps, respectively z, a=1200 Set minimum or maximum transfer rate at 1200bps, respectively z, a=2400 Set minimum or maximum transfer rate at 2400bps, respectively z, a=4800 Set minimum or maximum transfer rate at 4800bps, respectively z, a=7200 Set minimum or maximum transfer rate at 7200bps, respectively z, a=9600 Set minimum or maximum transfer rate at 9600bps, respectively z, a=12000 Set minimum or maximum transfer rate at 12000bps, respectively z, a=14400 Set minimum or maximum transfer rate at 14400bps, respectively z, a=16800 Set minimum or maximum transfer rate at 16800bps, respectively z, a=19200 Set minimum or maximum transfer rate at 19200bps, respectively z, a=21600 Set minimum or maximum transfer rate at 21600bps, respectively z, a=24000 Set minimum or maximum transfer rate at 24000bps, respectively z, a=26400 Set minimum or maximum transfer rate at 26400bps, respectively » z, a=28800 Set minimum or maximum transfer rate at 28800bps, respectively REPORT INFORMATION Type: Immediate Format: AT [cmds] In [cmds] Description: Displays modem properties Command Function I0 Reports OK I1 Performs checksum of firmware ROM and displays results I2 Performs checksum of firmware ROM and displays status (OK or ERROR) I3 Reports firmware version, model code, interface type, and MCU model I4 Reports identifier string I5 Reports country code I6 Reports modem data pump model, internal code revision and CEP internal code revision. REPORT LINE SIGNAL QUALITY Type: Immediate Format: AT [cmds] %Q [cmds] Description: Reports line signal quality. If the value is greater than 7, the modem will retrain. SLEEP TIMER Format AT [cmds] S24=n [cmds] Default: 0 Range: 0-255 Unit: 1 second Description: Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep 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 0 Local analog loopback not in progress 1 Local analog loopback in progress 2, 1 0 Not used 3 0 Modem not in remote digital loopback 1 Remote digital loopback in progress 4 0 Remote digital loopback not requested 1 Remote digital loopback requested 5 0 Remote digital loopback w/ self-test not in progress 1 Remote digital loopback w/ self-test in progress 6 0 Local analog loopback w/ self-test not in progress 1 Local analog loopback w/ self-test in progress V.23 SPLIT BAUD MODE Type: Configuration Format: AT [cmds] \Wn [cmds] Description: Controls V.23 split baud mode Command Function » \W0 V.23 split baud mode disabled \W1 V.23 split baud mode enabled V.23 SPLIT-SPEED DIRECTION Type: Configuration Format: AT [cmds] %Fn [cmds] Description: Selects flow control Command Function %F1 75bps transmit/1200bps receive enabled %F2 75bps receive/1200bps transmit enabled