MULTI-TECH SYSTEMS, INC. MT224EH/MT224EHI Modem Type Data (synchronous/asynchronous) Maximum Data Rate 2400bps Data Bus External Data Modulation Protocol Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23 Error Correction/Compression MNP5 [Image] CONNECTIONS Purpose Location Purpose Location DC power CN1 Line in CN4 RS-232/422 CN2 Power switch SW1 Line out CN3 Volume R1 ASYNCHRONOUS/SYNCHRONOUS Settings SW5/D Synchronous On » Asynchronous Off AUTO-ANSWER Settings SW4/E » Enable auto answer/originate On Disable/answer Off Note: When SW5/B is set for Lease Line operation, the options on this switch change to Originate and Answer BLIND/WAIT DIALING Settings SW5/C » Blind dialing Off Wait for dial tone On BAUD RATE Settings SW2 1200bps Position 1 300bps Position 2 2400bps Position 3 CD/DSR Settings SW4/F » CD/DSR normal On CD/DSR forced high Off COMMAND CHARACTERS Settings SW4/D » Echo enable On Echo disable Off COMMAND MODE Settings SW4/H » Enable Off Disable On CTS Settings SW5/A » CTS forced high On CTS normal Off CTS/RTS Settings JP2 » CTS follows RTS Pins 1 & 2 closed CTS forced high until disconnect Pins 2 & 3 closed DSR Settings JP3 » DSR follows CD Pins 2 & 3 closed DSR follows OH Pins 1 & 2 closed FORCED DTR Settings SW4/A » DTR forced high Off DTR normal On JACK TYPE Settings SW4/G » RJ11 On RJ12/13 Off RESULT CODES Settings SW4/B » Verbose On Terse Off RESULT CODES Settings SW4/C » Enable Off Disable On RTS Settings JP1 » RTS forced high Pins 1 & 2 closed RTS normal Pins 2 & 3 closed SWITCHED/LEASE LINE Settings SW5/B » Switched On Lease line Off VOICE/DATA MODE Settings SW3 Answer Position 1 Originate Position 2 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 24 Red Blinking fast Modem connected at 2400bps in reliable mode 24 Red Blinking slow Modem connected at 2400bps with data compression 24 Red Off Modem not connected at 2400bps 12 Red Blinking fast Modem connected at 1200bps in reliable mode 12 Red Blinking slow Modem connected at 1200bps with data compression 12 Red Off Modem not connected at 1200bps 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 Proprietary AT Command Set 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 » $AO Data is discarded. $A1 Data is buffered. BLIND DIALING Type: Configuration Format: AT [cmds] Bn [cmds] Example: AT B0 Description: Selects blind dial or wait-for-dial-tone. Command Function » B0 Modem will blind dial. B1 Modem will wait for dial tone before dialing. BUFFER SIZE Type: Configuration Format: AT [cmds] &Bn [cmds] Example: AT &B0 Description: Selects the modem’s transmit/receive buffer size. Command Function » &B0 Normal buffer size. &B1 Small buffer size. CD SIGNAL Type: Configuration Format: AT [cmds] &Cn [cmds] Example: AT &C3 $D0 Description: Configures the behavior of the carrier detect signal. Command Function &C0 CD forced high. » &C1 CD normal. &C2 CD forced high except during disconnect. COMMAND SET Type: Configuration Format: AT [cmds] &Qn [cmds] Example: AT &Q0 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. 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. DSR/CTS/CD 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 DSR, CTS, and CD signals to hangup. DTR DIALING Type: Configuration Format: AT [cmds] $Dn [cmds] Example: AT $D1 DT555-1212 Description: Selects the DTR dialing function. Command Function » $D0 DTR dialing disabled. $D1 DTR dialing enabled. DTR TIMEOUT Type: Register Format: AT [cmds] S25=n [cmds] Example: ATS25=30 Default: 0 Range: 0-255 Unit: .1 second Description: Sets the time to drop the DTR signal to hangup. Note: Setting S25 to 0 sets the DTR timeout to 50 ms. DUPLEX Type: Configuration Format: AT [cmds] Fn [cmds] Example: AT F1 &W Description: Controls duplex mode. Command Function F0 Half duplex enabled. » F1 Full duplex enabled. FACTORY DEFAULTS Type: Immediate Format: AT &F Example: AT &F Description: Loads factory defaults from ROM and DIP-switches. FLOW CONTROL Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E13 Description: Selects flow control. Command Function &E12 Flow control disabled. » &E13 Flow control enabled. FLOW CONTROL - ENQ/ACK Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E8 Description: Selects ENQ/ACK pacing. Command Function » &E8 Disables ENQ/ACK pacing. &E9 Enables ENQ/ACK pacing. FLOW CONTROL IN NORMAL MODE Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E11 O Description: Selects XON/XOFF flow control for non-error-correcting connections. Command Function » &E10 XON/XOFF disabled for non-error-correcting connections. &E11 XON/XOFF enabled for non-error-correcting connections. FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E3 &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. 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. $H4 Shows help screen 4. INACTIVITY TIMER Type: Configuration Format: AT [cmds] &In [cmds] Example: AT &I5 S30=40 Description: Sets the length of time that the modem does not receive information before it disconnects. Command Function » &I0 Inactivity timer disabled. &I1 Modem will disconnect after 10 minutes of inactivity. &I2 Modem will disconnect after 30 minutes of inactivity. &I3 Modem will disconnect after 60 minutes of inactivity. LIST CONFIGURATION Type: Immediate Format: AT Ln Example: AT L5 Description: Lists modem configuration. Command Function L0 Lists all phone numbers in memory. L5 Lists all settings. L6 Lists the values of all S-registers. L7 Lists extended parameters. LOCAL SERIAL PORT SPEED Type: Configuration Format: AT [cmds] $SBnnn [cmds] Example: AT $MB9600 $SB19200 Description: Sets serial port speed. Command Function $SB110 Sets 110bps speed. $SB300 Sets 300bps speed. $SB1200 Sets 1200bps speed. » $SB2400 Sets 2400bps speed. $SB4800 Sets 4800bps speed. $SB9600 Sets 9600bps 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. LOOPBACK TEST MODE Type: Configuration Format: AT [cmds] Un [cmds] Example: AT U2 &W Description: Places modem in test mode. Command Function U0 Begin local analog loopback test in originate mode. U1 Begin local analog loopback test in answer mode. U2 Request remote digital loopback U3 Begin local digital loopback. 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 256 characters. PROTOCOL Type: Configuration Format: AT [cmds] &Vn [cmds] Example: AT &V1 Description: Selects the protocol for low-speed data calls. Command Function &V0 Bell protocols. » &V1 ITU-T protocols. REDIAL Type: Immediate Format: A: Example: A: Description: Redials the last number dialed until it is no longer busy. Note: Do not precede this command with AT or follow it with . REMOTE CONNECT SPEED Type: Configuration Format: AT $MBnnn Example: AT $MB2400 $SB19200 Description: Sets maximum remote connect speed. Command Function $MB75 Sets V.23 (1200bps/75bps bi-directional). $MB110 Sets 110bps connect. $MB300 Sets 300bps connect. $MB1200 Sets 1200bps connect. » $MB2400 Sets 2400bps 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. STORE PHONE NUMBER IN NVRAM Type: Configuration Format: AT [cmds] D<#>N<0-9> Example: ATD1(303)-443-3323N6 Description: Stores a phone number in the modem’s memory. Only the dialstring before the Nn will be stored. 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. WAIT FOR DIAL TONE Type: Immediate Format: AT [cmds] W [cmds] Example: AT W Description: Wait for new dial tone. XON/XOFF PASS-THROUGH Type: Configuration Format: AT [cmds] &En [cmds] Example: AT &E6 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.