MULTI-TECH SYSTEMS, INC. MT224AH 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, V.42, V.42bis [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 Wait for dial tone On » Blind dialing Off 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 Disable On » Enable Off 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 normal On » DTR forced high Off JACK TYPE Settings SW4/G » RJ11 On RJ12/13 Off RESULT CODES Settings SW4/B » Verbose On Terse Off RESULT CODES Settings SW4/C Disable On » Enable Off 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 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. 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. 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. 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. 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. 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. 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 . 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 N will be stored. WAIT FOR DIAL TONE Type: Immediate Format: AT [cmds] W [cmds] Example: AT W Description: Wait for new dial tone.