MULTITECH SYSTEMS, INC. MT2834PCS, MT2834PCS/ISI, MT2834PCSK, MT2834PCSK/ISI Modem Type Data (synchronous/asynchronous)/Fax/Simultaneous voice Maximum Data Rate 28.8Kbps Maximum Fax Rate 14.4Kbps Data Bus External Fax Class Class I & II Data Modulation Protocol Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 AT&T V.32terbo Multitech MSP Fax Modulation Protocol ITU-T V.17, V.21CH2, V.27ter, V.29 Error MNP2-5, V.42, V.42bis Correction/Compression [Image] CONNECTIONS Purpose Location Purpose Location Line in CN1 DC power CN4 Line out CN2 Volume R1 RS-232/422 CN3 Power switch SW4 ORIGINATE MODE Mode SW3 Originate Off Answer On DTR MODE Mode SW1/1 » DTR normal On DTR forced high Off FLOW CONTROL Mode Async/Sync SW1/2 » Hardware flow Async On control Software flow control Async Off » SDLC Sync On BSC Sync Off RESULT CODES and LINE ATTENUATION Mode Switched/Leased SW1/3 » Result codes enabled Switched Off Result codes disabled Switched On » Transmit at 0dB Leased Off Transmit at -10dB Leased On UUCP SPOOFING and AS/400 MODE Mode Async/Sync SW1/4 » UUCP spoofing Async On disabled UUCP spoofing enabled Async Off AS/400 disabled Sync On AS/400 enabled Sync Off AUTO-ANSWER and ANSWER/ORIGINATE Mode Switched/Leased SW1/5 » Auto-answer enabled Switched On Auto-answer disabled Switched Off » Answer mode Leased On Originate mode Leased Off EFFICIENCY MODE and SLAVE CLOCK Mode Async/Sync SW1/6 » Modem set to maximum Async On effiency Modem not set to maximum Async Off effiency » Clock controlled Sync On remotely Clock controlled locally Sync Off RTS MODE Mode SW1/7 » RTS forced high Off RTS normal On COMMAND MODE Mode SW1/8 » Command mode enabled Off Command mode disabled On LOOPBACK MODE Mode SW1/9 » Remote loopback Off Local loopback On LINE TYPE Type SW1/10 » Switched On Leased Off RESULT CODE TYPE and CLOCK SOURCE Mode Async/Sync SW1/11 » Multitech result Async Off codes AT result codes Async On » Internal clock Sync Off External clock Sync On ASYNCHRONOUS/SYNCHRONOUS MODE Mode SW1/12 » Asynchronous Off Synchronous On OPERATION SPEED Speed SW2/1 SW2/2 » 28.8Kbps On On 19.2Kbps Off On 14.4Kbps On Off 9600bps Off Off CD/DSR MODE Mode SW2/3 » CD and DSR normal On CD and DSR forced high Off FACTORY CONFIGURED - DO NOT ALTER Switch Position SW2/4 N/A DIAGNOSTIC LED(S) LED Color Status Condition SD Red On Modem is transmitting data SD Red Off Modem is not transmitting data RD Red On Modem is receiving data RD Red Off Modem is not receiving data CD Red On Carrier signal detected CD Red Off Carrier signal not detected 28.8 Red On Modem connected at 28.8Kbps 28.8 Red Off Modem not connected at 28.8Kbps 24.0 Red On Modem connected at 24Kbps 24.0 Red Off Modem not connected at 24Kbps 19.2 Red On Modem connected at 19.2Kbps 19.2 Red Off Modem not connected at 19.2Kbps 14.4 Red On Modem connected at 14.4Kbps 14.4 Red Off Modem not connected at 14.4Kbps 96 Red On Modem connected at 9600bps 96 Red Off Modem not connected at 9600bps 24 Red On Modem connected at 2400bps 24 Red Off Modem not connected at 2400bps 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 EC Red On Error correction enabled EC Red Off Error correction disabled EC Red Blinking Error correction activated FX Red On Modem is connected in FAX mode FX Red Off Modem is not connected in FAX mode ER Red On Test failed or leased line connection not OK ER Red Off Test did not fail and/or leased line connection OK Proprietary AT Command Set AMBIENT NOISE SENSITIVITY Type: Configuration Format: AT [cmds] >HVn [cmds] Example: AT >HV10 >C0 Default: 7 Range: 0-14 Description: Sets the modem’s sensitivity to ambient noise, with 0 being the most sensitive. AUTO-RELIABLE TIME BUFFER CONFIGURATION Type: Configuration Format: AT [cmds] $An [cmds] Example: AT $A1 &W Description: Controls the handling of incoming data during auto-reliable time period. Command Function » $A0 Data is discarded. $A1 Data is buffered. BIT MODE Type: Configuration Format: AT [cmds] $EBn [cmds] Example: AT $EB1 E1 Description: Selects 10- or 11-bit mode. Command Function » $EB0 Sets 10-bit mode. $EB1 Sets 11-bit mode. CALLBACK ATTEMPTS Type: Register Format: AT [cmds] S16=n [cmds] Example: ATS16=6 Default: 4 Range: 1-255 Unit: 1 attempt Description: Sets the maximum number of login attempts after initial callback connection. CALLBACK NUMBER Type: Configuration Format: AT [cmds] [+/-]DT<#>Nnn Examples: AT#DB2 +-DT555-1212N10 Description: Sets the phone number associated with the password at memory location nn. Command Function +DT Modem will initiate callback on successful login. -DT Modem will allow immediate entry on successful login without callback. +-DT If password is followed by a -, modem will allow immediate entry. If password is followed by a + or nothing, modem will initiate callback. CALLBACK PARITY Type: Configuration Format: AT [cmds] #Pn [cmds] Example: AT #P0 #DB1 Description: Sets the parity of the modem when in callback mode. Command Function » #P0 No parity. #P1 Odd parity. #P2 Even parity. CALLBACK PASSWORD Type: Configuration Format: AT [cmds] #CBNnnxxxx Example: AT#DB2 #CBN09snarf Description: Sets the callback password at memory location nn to xxxx. The password must be between 6 and 10 characters, inclusive. CALLBACK SECURITY Type: Configuration Format: AT [cmds] #DBn [cmds] Example: AT #DB1 S0=1 Description: Sets the security level of the callback function. Command Function » #DB0 Disables security and clears callback memory. #DB1 Enables remote security only. #DB2 Enables local and remote security. COMMAND ESCAPE TYPE Type: Configuration Format: AT [cmds] %En [cmds] Example: AT %E3 &W Description: Sets type and response of command escape sequence. Command Function %E0 Command escape disabled. » %E1 TIES escape (+++AT...) %E2 AT method. %E3 Both TIES and BREAK methods. %E4 OK response to command escape disabled. %E5 OK response to command escape enabled. COMMAND SET Type: Configuration Format: AT &Qn Example: AT &Q1 Description: Selects standard Hayes or custom command sets. Command Function » &Q0 Multi-Tech custom command set enabled. &Q1 Standard Hayes command set enabled. COMPRESSION Type: Configuration Format: AT &En Example: AT &E15 #L0 Description: Selects data compression. Command Function &E14 Data compression disabled. » &E15 Data compression enabled. COMPRESSION MODE Type: Configuration Format: AT #Ln Example: AT #L2 DT555-1212 Description: Selects active compression protocols. Command Function » #L0 V.42 negotiation enabled. #L1 MNP negotiation enabled. #L2 LAP-M negotiation enabled. #L3 LAP-M enabled, no negotiation. CTS SIGNAL Type: Configuration Format: AT [cmds] &RFn [cmds] Example: AT &RF0 Description: Selects the function of the CTS signal. Command Function &RF0 CTS is set to RTS. » &RF1 CTS is independent of RTS. DETECTION MODE Type: Configuration Format: AT [cmds] >DTn [cmds] Example: AT >DT1 Description: Sets the responses the modem will detect. Command Function » >DT0 Detection disabled. >DT1 DTMF detection enabled. >DT2 All signals will be detected. DIAL STORED PHONE NUMBER Type: Immediate Format: AT [cmds] Nn1 [Nn2, Nn3...] Example: ATM0 N1N3N5 Description: Dials stored phone number(s). If the first number is busy, the modem will proceed to the next number in the list. DIALING MODE Type: Configuration Format: AT [cmds] $VDn [cmds] Example: AT $VD Description: Selects voice/data mode dialing. Command Function » $VD0 Disables voice/data mode. $VD1 Enables voice/data mode. DSP INPUT Type: Configuration Format: AT [cmds] >DIn [cmds] Example: AT >DI4 >DO6 Description: Sets the input source of the digital signal processor. Command Function » >DI0 Input disabled. >DI1 Input from line in. >DI2 Input from handset. >DI3 Input from phone. >DI4 Input from PC. >DI5 Input from voicemail. >DI6 Input from Digital Simultaneous Voice Mode session. DSP OUTPUT Type: Configuration Format: AT [cmds] >DOn [cmds] Example: AT >DI5 >DO3 Description: Sets the output device of the digital signal processor. Command Function » >DO0 Output disabled. >DO1 Output to line out. >DO2 Output to handset. >DO3 Output to phone. >DO4 Output to PC. >DO5 Output to voicemail. >DO6 Output to Digital Simultaneous Voice Mode session. DSR SIGNAL Type: Configuration Format: AT [cmds] &SFn [cmds] Example: AT &SF0 Description: Selects the function of the DSR signal. Command Function » &SF0 DSR is set to CD. &SF1 DSR is independent of CD. DSVD TALK ANYTIME™ Type: Configuration Format: AT [cmds] >Cn [cmds] Example: AT >C1 O Description: Enables DSVD (Digital Simultaneous Voice Data) connection. Command Function » >C0 Talk Anytime™ enabled. >C1 Talk Anytime™ disabled. DSVD Type: Immediate Format: AT [cmds] >VDn [cmds] Example: AT >VD1 O Description: Activates DSVD (Digital Simultaneous Voice Data) connection. Command Function » >VD0 Deactivates DSVD. >VD1 Activates DSVD. DTR DIALING Type: Configuration Format: AT [cmds] $Dn [cmds] Example: AT $D1 DT555-1212 Description: Turns DTR dialing on and off. Command Function » $D0 DTR dialing disabled. $D1 DTR dialing enabled. DTR TIMEOUT Type: Register Format: AT [cmds] S24=n [cmds] Example: ATS24=40 Default: 20 Range: 0-255 Unit: 50 ms Description: Sets the time to drop the DTR signal to hangup. ERASE CALLBACK PASSWORD Type: Immediate Format: AT [cmds] #RCBNn [cmds] Example: AT #RCBN05 #RDN05 Description: Erases the callback password at the memory location specified. ERASE CALLBACK NUMBER Type: Immediate Format: AT [cmds] #RDNn [cmds] Example: AT #RCBN05 #RDN05 Description: Erases the callback phone number at the memory location specified. ERROR CORRECTION DISABLE ON CONNECT Type: Configuration Format: AT [cmds] $Fn [cmds] Example: AT $F1 DT555-1212 Description: Selects whether error correction can be disabled by a while handshaking. Command Function $F0 Error correction handshake interrupt disabled. » $F1 Error correction handshake interrupt enabled. ESCAPE SEQUENCE BUFFER SIZE Type: Register Format: AT [cmds] S34=n [cmds] Example: ATS34=30 Default: 10 Range: 0-60 Unit: 1 byte Description: Sets the size of the buffer used to store commands during an escape sequence. ESCAPE SEQUENCE - OUT OF BAND Type: Immediate Format: AT [cmds] Example: AT #F1 Description: Puts the modem in Command Mode. Notes: Do not precede this command with AT. refers to the hardware modem break signal. ESCAPE SEQUENCE TIMEOUT Type: Register Format: AT [cmds] S32=n [cmds] Example: ATS32=30 Default: 20 Range: 0-255 Unit: 1 second Description: Sets the maximum amount of time the modem will wait for a while executing an escape sequence. FACTORY DEFAULTS Type: Immediate/Configuration Format: AT &F[n] Example: AT &F8 Description: Loads factory defaults, or sets write protect on NVRAM. Command Function &F Reloads defaults by setting. (Immediate, see below.) » &F8 Sets &F to read factory defaults from ROM, and disables NVRAM write protect. &F9 Sets &F to read defaults from NVRAM, and enables write-protect. FAILED PASSWORD ATTEMPTS Type: Register Format: AT [cmds] S26? Example: ATS26? Default: Read-only Range: 0-255 Unit: 1 attempt Description: This register stores the number of failed password attempts. FALLBACK MODE Type: Configuration Format: AT [cmds] #Fn [cmds] Example: AT #F1 O Description: Sets direction of fallback. Command Function #F0 Fallback disabled. #F1 Fallback from 28.8Kbps to 2400bps as line quality degrades. » #F2 Fallback from 2400bps to 28.8Kbps as line quality improves. FLOW CONTROL NORMAL MODE Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E11 O Description: Selects normal flow control. Command Function » &E10 Normal mode disabled. &E11 Normal mode enabled. FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E4 &W Description: Sets type of flow control used by modem. Command Function &E3 Flow control disabled. » &E4 CTS/RTS flow control enabled. &E5 XON/XOFF flow control enabled. HANDSHAKE ATTEMPTS Type: Configuration Format: AT [cmds] #An [cmds] Example: AT #A1 #L3 Description: Configures the initial handshake phase. Command Function #A0 Attempts in order: 28.8Kbps, 24Kbps, 21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps, 2400bps, 1200bps, 300bps. #A1 Attempts only 28.8Kbps. #A2 Attempts in order: 28.8Kbps, 24Kbps, 21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps. #A3 Attempts in order: 2400bps, 1200bps, 300bps. HELP SCREENS Type: Immediate Format: AT $Hn Example: AT $H1 Description: Shows modem help screens. Command Function $H1 Shows help screen 1. $H2 Shows help screen 2. $H3 Shows help screen 3. LIST CONFIGURATION Type: Immediate Format: AT Ln Example: AT L5 Description: Lists modem configuration. Command Function L5 Lists all settings. L6 Lists the values of all S-registers. L7 Lists extended parameters. L8 Lists current diagnostics. LINE CONNECTION Type: Configuration Format: AT [cmds] >PHn [cmds] Example: AT >PH1 Description: Selects the operation mode of the modem. Command Function » >PH0 Modem is in data mode. >PH1 Modem is in voice mode. LOCAL SERIAL PORT SPEED Type: Configuration Format: AT [cmds] $SBnnn [cmds] Example: AT $MB9600 $SB19200 Description: Sets serial port speed. Command Function $SB300 Sets 300bps speed. $SB1200 Sets 1200bps speed. $SB2400 Sets 2400bps speed. $SB4800 Sets 4800bps speed. $SB9600 Sets 9600bps speed. $SB19200 Sets 19.2Kbps speed. $SB38400 Sets 38.4Kbps speed. $SB57600 Sets 57.6Kbps speed. $SB115200 Sets 115.2Kbps speed. LOCK SERIAL PORT Type: Configuration Format: AT [cmds] $BAn [cmds] Example: AT $SB57600 $BA0 Description: Sets operation of serial port speed. Command Function » $BA0 Serial speed locked at rate set by $SB. $BA1 Serial speed follows connect speed, ignoring $SB. LOGIN PASSWORD Type: Configuration Format: AT [cmds] #Ixxxx Example: AT #IMicroHouse Description: Sets the login password to xxxx. The password must be between 6 and 10 characters, case sensitive. It defaults to MULTI-TECH. MAXIMUM BLOCK SIZE FOR TRANSMISSION Type: Configuration Format: AT [cmds] &BSn [cmds] Example: AT &BS1 &MB28800 Description: Sets the maximum transmittable block size. Command Function &BS0 Maximum block size is 64 characters. » &BS1 Maximum block size is 128 characters for LAP-M, and 256 characters for MNP. MICROPHONE Type: Configuration Format: AT [cmds] >Mn>MVn [cmds] Example: AT >M2>MV5 Description: Turns the microphone of the attached telephone handset on or off. Note: An >MV command must be issued on the same line. Command Function >M0 Disables microphone. » >M2 Enables microphone. MICROPHONE SENSITIVITY Type: Configuration Format: AT [cmds] >MVn [cmds] Example: AT >MV6 Default: None Range: 0-14 Description: Sets the microphone’s sensitivity, with 0 being the most sensitive. MSP MODE Type: Configuration Format: AT [cmds] >%Pn [cmds] Example: AT >%P1 Description: Enables or disables Multitech Supervisory Protocol (MSP). Command Function » %P0 MSP disabled. %P1 MSP enabled. PACING Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E13 Description: Selects ENQ/ACK pacing. Command Function &E12 Disables ENQ/ACK pacing. » &E13 Enables ENQ/ACK pacing. PACING - ENQ/ACK Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E9 Description: Selects ENQ/ACK pacing. Command Function » &E8 Enables ENQ/ACK pacing. &E9 Disables ENQ/ACK pacing. REDIAL Type: Immediate Format: ATA: Example: ATA: Description: Redials the last number dialed until it is no longer busy. REMOTE CONNECT SPEED Type: Configuration Format: AT $MBnnn Example: AT $MB9600 $SB19200 Description: Sets maximum remote connect speed. Command Function $MB75 Sets V.23 (1200bps/75bps bi-directional). $MB300 Sets 300bps connect. $MB1200 Sets 1200bps connect. $MB2400 Sets 2400bps connect. $MB4800 Sets 4800bps connect. $MB9600 Sets 9600bps connect. $MB14400 Sets 14.4Kbps connect. $MB19200 Sets 19.2Kbps connect. $MB28800 Sets 28.8Kbps connect. RETRANSMIT FAIL ACTION Type: Configuration Format: AT [cmds] $Rn [cmds] Example: AT $R1 Description: Sets whether the modem gives up on a bad connection. Command Function » $R0 Hang up after 12 failed retransmissions. $R1 Do not hang up after 12 failed retransmissions. SETUP INACTIVITY TIMER Type: Register Format: AT [cmds] S29=n [cmds] Example: ATS29=5 Default: 20 Range: 1-255 Unit: 1 minute Description: Sets the maximum amount of time between commands until the setup password must be re-entered. SPEAKER Type: Configuration Format: AT [cmds] >Sn>SVn [cmds] Example: AT >S2>SV5 Description: Turns the speaker of the attached telephone handset on or off. Note: An >SV command must be issued on the same line. Command Function >S0 Disables speaker. » >S2 Enables speaker. SPEAKER VOLUME Type: Configuration Format: AT [cmds] >SVn [cmds] Example: AT >SV6 Default: None Range: 0-14 Description: Sets the speaker’s volume, with 0 being the most sensitive. STORE PHONE NUMBER IN NVRAM Type: Configuration Format: AT [cmds] D<#>Nn [dialstring] Example: ATD555-1212N1 Description: Stores a phone number in the modem’s memory. TIME UNTIL HANG UP ON LOW DTR Type: Register Format: AT [cmds] S36=n [cmds] Example: ATS36=5 Default: 0 Range: 0-255 Unit: 1 second Description: Sets the maximum amount of time the modem will wait to hang up after the DTR signal goes low. TIME UNTIL PICK UP ON HIGH DTR Type: Register Format: AT [cmds] S37=n [cmds] Example: ATS37=5 Default: 0 Range: 0-255 Unit: 1 second Description: Sets the maximum amount of time the modem will wait to pick up after the DTR signal goes high. TRELLIS MODULATION Type: Configuration Format: AT [cmds] #Tn [cmds] Example: AT #T1 Description: Controls Trellis Coded Modulation. Command Function #T0 Disables TCM. » #T1 Enables TCM. V.25 MODE Type: Configuration Format: AT [cmds] $Vn [cmds] Example: AT $V2 CIC Description: Configures V.25bis mode. Command Function » $V0 Disables V.25bis. $V1 Enables V.25bis. $V2 Modem will accept one V.25bis command and will then return to AT command mode. $V5 DSR follows DTR in V.25bis command mode. $V6 DSR operates normally in V.25bis command mode. V.32terbo CONTROL Type: Configuration Format: AT [cmds] #Vn [cmds] Example: AT #V1 DT555-1212 Description: Controls the V.32terbo protocol in answer mode. Command Function » #V0 V.32terbo enabled. #V1 V.32terbo disabled. V.42 MODE Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E0 Description: Configures the operation of V.42 mode. Command Function &E0 Error correction disabled. » &E1 V.42 set to auto-reliable. &E2 V.42 set to reliable. VOICE BANDWIDTH Type: Configuration Format: AT [cmds] >An [cmds] Example: AT >A0 Description: Sets the bandwidth reserved for voice transmission. Command Function >A0 Voice bandwidth set to 9600bps. >A1 Voice bandwidth set to 16Kbps. » >A2 Voice bandwidth set to 16Kbps if connected at 19.2Kbps or above, or 9600bps otherwise. XOFF SEND Type: Configuration Format: AT [cmds] #Xn [cmds] Example: AT #X1 Description: Selects how XOFF signal is sent. Command Function » #X0 Single XOFF character sent until ready. #X1 Multiple XOFF characters sent until ready. XON/XOFF PASS-THROUGH Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E7 O Description: Selects whether XON/XOFF signals are sent to remote modem. Command Function » &E6 XON/XOFF signals trapped by local modem. &E7 XON/XOFF passed through local modem. Proprietary V.25bis Command Set CLEAR MEMORY LOCATION Type: Immediate Format: CLAn Example: CLA05 Description: Clears the phone number in memory location nn. LOCAL SERIAL PORT SPEED Type: Configuration Format: CSPn Example: CSP38400 Description: Sets serial port speed. Command Function CSP300 Sets 300bps speed. CSP1200 Sets 1200bps speed. CSP2400 Sets 2400bps speed. CSP4800 Sets 4800bps speed. CSP9600 Sets 9600bps speed. CSP19200 Sets 19.2Kbps speed. CSP38400 Sets 38.4Kbps speed. CSP57600 Sets 57.6Kbps speed. CSP115200 Sets 115.2Kbps speed. CALL REQUESTED NUMBER Type: Immediate Format: CRI<#>;n Example: CRI1-303 555-1212;fubar Description: Same as CRN. Dials the number given. It will ignore spaces and hyphens in the string. If the string is more than fifty characters long, a result of INV will be returned. The identification string n will be ignored. REQUEST LISTED NUMBERS Type: Immediate Format: RLN Example: RLN Description: Requests the modem to return the list of stored numbers. If no numbers are stored, the modem will return LSN.