MEGAHERTZ CORPORATION A2144 Modem Type Data (synchronous/asynchronous)/Fax Maximum Data Rate 14.4Kbps Maximum Fax Rate 14.4Kbps Data Bus PCMCIA Type II Fax Class Class II Data Modulation Protocol Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32b, V.32bis Fax Modulation Protocol ITU-T V.17, V.21CH2, V.27ter, V.29 Error Correction/Compression MNP10, MNP5, V.42, V.42bis V1283 Proprietary AT Command Set BIT-MAPPED REGISTER S14 Format AT [cmds] S14=n [cmds] Example: ATS14=138 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] Example: AT S21=169 Default: 4 Range: 0 - 253 Unit: Bit-mapped Description: Controls jack type, CTS signal, low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function. Bit Value Function 0 » 0 Selects RJ-11, RJ-41S, or RJ45S jack. 1 Selects RJ-12 or RJ-13 jack. 1 0 Not used. 2 0 CTS follows RTS. » 1 CTS forced high. 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] Example: AT S22=89 Default: 117 Range: 0 - 127 Unit: Bit-mapped Description: Controls speaker volume and controls, and result codes. Bit Value Function 1, 0 00 Off volume. » 01 Low 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] Example: ATS23=152 Default: 183 Range: 0 - 255 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] Example: AT S27=8 Default: 9 Range: 0 - 127 Unit: Bit-mapped Description: Controls connection mode, line type, internal clock, and protocols. Bit Value Function 3, 1, 0 000 Asynchronous mode, serial port speed follows connect speed. 001 Asynchronous off-line command mode and » 101 synchronous connect mode. 110 Error-correcting mode. Asynchronous mode, serial port speed locked. 2 » 0 Dial up line. 1 Leased line. 5, 4 » 00 Internal DTE transmit clock source. 01 External DTE transmit clock source. 10 Slave DTE transmit clock source. 6 » 0 ITU-T protocols. 1 Bell protocols. BIT-MAPPED REGISTER S28 Format AT [cmds] S28=n [cmds] Example: AT S28=8 Default: 0 Range: 0 - 31 Unit: Bit-mapped Description: Controls V.23 split speed, V.23 split screen, V.23 half duplex, and pulse dialing. Bit Value Function 0 » 0 V.23 split speed operation disabled. 1 V.23 split speed operation enabled. 1 » 0 Select 75bps transmit, 1200bps receive. 1 Select 1200bps transmit, 75bps receive. 2 » 0 1200bps transmit , 1200bps receive disabled. 1 1200bps transmit , 1200bps receive enabled. 4, 3 » 00 39ms make/61ms break at 10pps. 01 33ms make/67ms break at 10pps. 10 39ms make/61ms break at 20pps. 11 33ms make/67ms break at 20pps. BIT-MAPPED REGISTER S31 Format AT [cmds] S31=n [cmds] Example: AT S31=69 Default: 0 Range: 0 - 255 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. 2 » 00 DTE speed displayed in result codes. 01 Extended result codes enabled and DCE speed displayed in result codes. 10 DCE speed displayed in result codes. BIT-MAPPED REGISTER S40 Format AT [cmds] S40=n [cmds] Example: AT S40=155 Default: 105 Range: 0 - 255 Unit: Bit-mapped Description: Controls power level and break handling, MNP10, link negotiation, and block size. Bit Value Function 0 0 MNP10 disabled. » 1 MNP10 enabled. 1 » 0 Power level adjustment enabled. 1 Power level adjustment disabled. 2 » 0 Link will be negotiated at highest possible speed. 1 Link will be negotiated at 1200bps. 5, 4, 3 000 Selects \K0. 001 Selects \K1. 010 Selects \K2. 011 Selects \K3. 100 Selects \K4. » 101 Selects \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] Example: AT S41=18 Default: 3 Range: 0 - 31 Unit: Bit-mapped Description: Selects compression, auto-retrain, flow control, and MNP mode. Bit Value Function 1 - 0 00 Data compression disabled. 01 MNP5 enabled. 10 V.42bis enabled. » 11 MNP5 and V.42bis enabled. 2 » 0 Auto-retrain disabled. 1 Auto-retrain enabled. 3 » 0 Flow control disabled. 1 Flow control enabled. 4 » 0 Stream mode for MNP. 1 Block mode for MNP. BIT-MAPPED REGISTER S80 Format AT [cmds] S80=n [cmds] Example: AT S80=223< CR> Default: 0 Range: 0 - 224 Unit: Bit-mapped Description: Controls command sets, remote configuration, and call back security. Also accesses EPROM data lines. Bit Value Function 0 - 4 N/A EPROM data lines. 5 » 0 AT command set enabled. 1 V.25bis command set enabled. 6 » 0 Remote configuration disabled. 1 Remote configuration enabled. 7 » 0 Call back security disabled. 1 Call back security enabled. BREAK SEND Type: Configuration Format: AT [cmds] \Bn [cmds] Example: AT \B3 &W Range: 1 - 9 Unit: .1 Second Description: Sends break to modem. BREAK TYPE Type: Configuration Format: AT [cmds] \Kn [cmds] Example: AT \K1 Description: Configures action of break signal. Command Break from DTE Modem receives Break received \B from remote modem \K0 Online command Break sent to Buffers mode enabled, remote modem and cleared, break send no break to buffered sent to DTE. remote modem. cleared. \K1 Break sent to Break sent to Buffers remote modem and remote modem and cleared, break buffered buffered sent to DTE. cleared. cleared. \K2 Online command Send break to Break sent mode enabled, remote modem immediately to send no break to immediately. DTE. remote modem. \K3 Send break to Send break to Break sent remote modem remote modem immediately to immediately. immediately. DTE. \K4 Online command Send break with Break sent with mode enabled, transmitted received data send no break to data. to the DTE. remote modem. \K5 Send break with Send break with Break sent with transmitted transmitted received data data. data. to the DTE. CONFIGURATION PROFILES Type: Immediate Format: AT [cmds] \Sn [cmds] Example: AT\S0 Description: Displays active configuration profiles. CONNECT MODE Type: Configuration Format: AT [cmds] \Nn [cmds] Example: AT \N3 DT555-1212 Description: Sets connect mode. Command Function \N0 Normal mode enabled. \N2 Reliable mode enabled. \N3 Auto-reliable mode enabled. \N4 LAPM mode enabled. \N5 MNP mode enabled. DISPLAY STORED NUMBERS Type: Immediate Format: AT [cmds] \Fn [cmds] Example: AT \F2=9W1-303-555-1212 \F? Description: Displays all stored phone numbers. ERROR CORRECTION REJECTION Format AT [cmds] S36=n [cmds] Example: AT S36=3 Default: 7 Range: 0 - 7 Unit: Bit-mapped Description: Configures the modem’s behavior if an error-correcting connection cannot be made. Bit Value Function 0 - 2 000 Modem disconnects. 001 Modem attempts direct connection. 011 Modem attempts normal connection. 100 Modem attempts MNP connection. 101 Modem attempts MNP connection. If it fails, modem attempts direct connection. » 111 Modem attempts MNP connection. If it fails, modem attempts normal connection. FLASH DIAL MODIFIER TIME Format AT [cmds] S29=n [cmds] Example: AT S29=26 Default: 0 Range: 0 - 255 Unit: 10 ms Description: Time the modem will go on-hook upon receiving the ! dial modifier in dial string. FLOW CONTROL Type: Configuration Format: AT [cmds] \Gn [cmds] Example: AT G1 &K3 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] Example: ATS33=34 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] Example: ATS32=86 Default: 17 Range: 0 - 255 Unit: ASCII Description: Sets the character used to represent XON. HANDSHAKE OPTIONS Type: Configuration Format: AT [cmds] S48=n [cmds] Example: AT S48=7 Default: 7 Range: 0, 7, or 128 Description: Controls the V.42 handshake sequence. Command Function S48=0 V.42 negotiation disabled. S48=7 V.42 negotiation enabled. S48=128 V.42 disabled; fallback according to S36. LEASED LINE TRANSMISSION LEVEL Type: Configuration Format: AT [cmds] S99=n [cmds] Example: AT S99=8 Default: 10 Range: 0 - 15 Unit: -1 dBm Description: Sets the signal level for transmission when in leased-line mode. LINE TYPE Type: Configuration Format: AT [cmds] %Mn [cmds] Example: AT %M0 H1 DT555-1212 Description: Selects line type. Command Function %M0 Switched line. %M1 Leased line. MAXIMUM BLOCK SIZE FOR TRANSMISSION Type: Configuration Format: AT [cmds] \An [cmds] Example: AT \A3 &MB28800 Description: Sets the maximum transmittable block size. Command Function \A0 Maximum MNP block size is 64 characters. \A1 Maximum MNP block size is 128 characters. \A2 Maximum MNP block size is 192 characters. \A3 Maximum MNP block size is 256 characters. MNP STREAM/BLOCK MODE Type: Configuration Format: AT [cmds] \Ln [cmds] Example: AT \L1 DT555-1212 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] Example: AT %C1 -K1 -Q0 Description: Selects MNP10 data compression. Command Function -K0 MNP10 disabled. -K1 MNP10 enabled. -K2 MNP10 enabled on originate mode only. PROTOCOL/SPEED Type: Configuration Format: AT [cmds] Fn [cmds] Example: AT F0 A Description: Selects the current protocol and speed. Command Function F0 Auto-select fastest common protocol. F1 V.21/Bell 103A 300bps. F3 V.23 1200/75bps. F4 V.22/Bell 212A 1200bps. F5 V.22bis. F6 V.32bis/V.32 4800bps. F7 V.32bis 7200bps. F8 V.32 9600bps F9 V.32bis 12Kbps F10 V.32bis 14.4Kbps PROTOCOL/SPEED Format AT [cmds] S37=n [cmds] Example: AT S37=0 Default: 0 Range: 0 - 15 Unit: Bit-mapped Description: Selects the current protocol and speed. Bit Value Function 3 - 0 » 0000 Auto-select fastest common protocol. 0001 V.21/Bell 103A 300bps. 0010 V.21/Bell 103A 300bps. 0011 V.21/Bell 103A 300bps. 0100 Not used. 0101 V.22. 0110 V.22bis. 0111 V.23 1200/75bps. 1000 V.32bis/V.32 4800bps. 1001 V.32 9600bps. 1010 V.32bis 12Kbps. 1011 V.32bis 14.4Kbps. 1100 V.32bis 7200bps. SLEEP TIMER Format AT [cmds] S24=n [cmds] Example: AT S24=40 Default: 1 Range: 0 - 255 Unit: 10 ms Description: Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode. TEST MODES Format AT [cmds] S16=n [cmds] Example: AT S16=113 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. 1 0 Not used. 2 0 Local digital loopback not in progress. 1 Local digital loopback in progress. 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. TEST MODE - PTT Type: Configuration Format: AT [cmds] %TT [cmds] Example: AT %TT &W Description: Send PTT test signals for European line test. V.23 SPLIT BAUD MODE Type: Configuration Format: AT [cmds] \Wn [cmds] Example: AT \W1 Description: Controls V.23 split baud mode. Command Function \W0 V.23 split baud mode disabled. \W2 V.23 split baud mode enabled. WRITE TO LAST STATUS REGISTER Type: Configuration Format: AT [cmds] S=n [cmds] Example: AT S=6 Description: Set value of last accessed S-register.