ZOOM TELEPHONICS, INC. VFX 14.4V Modem Type Data (synchronous/asynchronous)/Fax/Voice Maximum Data Rate 14.4Kbps 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 Fax Modulation Protocol ITU-T V.17, V.21CH2, V.27ter, V.29 Error MNP5, V.42, V.42bis Correction/Compression [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 MSG Red On Stored faxes exist MSG Red Off No faxes stored FAX Red On Modem is connected in FAX mode FAX Red Off Modem is not connected in FAX mode 14.4 Red On Modem connected at 14.4Kbps 14.4 Red Off Modem not connected at 14.4Kbps V.32 Red On Modem is in V.32 mode. V.32 Red Off Modem is not in V.32 mode. V.42 Red On Modem is in V.42 mode. V.42 Red Off Modem is not in V.42 mode. DC Red On Error correction enabled DC Red Off Error correction disabled EC Red On Error correction enabled EC Red Off Error correction disabled FC Red On Flow control enabled FC Red Off Flow control disabled AA Red On Auto-answer enabled AA Red Off Auto-answer disabled AA Red Blinking Phone is ringing 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 RX Red On Modem is receiving data RX Red Off Modem is not receiving data TX Red On Modem is transmitting data TX Red Off Modem is not transmitting data TR Red On DTR signal is high TR Red Off DTR signal is low MR Red On Power is on MR Red Off Power is off Proprietary AT Command Set AUTO-RETRAIN Type: Configuration Format: AT %En Example: AT %E1 Description: Selects auto-retrain mode. Command Function » %E0 Auto-retrain disabled. %E1 Auto-retrain enabled. %E2 Fallback/fall forward enabled. %E3 Fallback/fall forward and fast hang-up enabled. COMPRESSION Type: Configuration Format: AT %Cn Example: AT *EC0 %C1 *AP0 Description: Selects data compression. Command Function %C0 Data compression disabled. %C1 MNP5 enabled. %C2 V.42bis enabled. » %C3 MNP5 and V.42bis enabled. BREAK SEND Type: Configuration Format: AT [cmds] \Bn [cmds] Example: AT \B3 &W Default: 3 Range: 1-9 Unit: .1 second Description: Sends break to modem. FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] \Kn [cmds] Example: AT \K1 Description: Configures action of break signal. Command Function \K0 Flow control disabled. » \K3 RTS/CTS flow control enabled. \K4 XON/XOFF flow control enabled. CONNECT MODE Type: Configuration Format: AT [cmds] \Nn [cmds] Example: AT \N1 DT555-1212 Description: Sets connect mode. Command Function \N0 Normal mode enabled. \N1 Direct mode enabled. \N2 Error correction mode enabled. » \N3 MNP mode with fallback to normal mode enabled. \N4 LAPM mode only enabled. \N5 MNP mode enabled. CONNECTION FAILURE CODES Format AT [cmds] S86? [cmds] Example: ATS86? Default: Read-only Range: 0, 4 - 14 Unit: None Stored: N/A Description: Reports codes which correspond to the possible causes of a connection failure. Value Meaning 0 No failure - normal hang-up. 4 Carrier signal lost. 5 No error-control detected for remote modem during feature negotiation. 6 Remote modem failed to respond to feature negotiation. 7 Local modem is asynchronous-only, remote modem is synchronous-only. 8 No common framing technique found. 9 No common protocol found. 10 Remote modem sent erroneous feature negotiation message. 11 Remote modem failed to send synchronous information. 12 No failure - remote modem disconnected normally. 13 Remote modem failed to respond after 10 re-transmissions same message. 14 Violation of negotiated protocol caused failure. ERROR CORRECTION REJECTION Format AT [cmds] S36=n [cmds] Example: ATS36=0 Default: Unidentified Range: 0 - 7 Unit: Bit-mapped Description: Configures the modem’s behavior if an error-correcting connection cannot be made. Command Function 0 Modem disconnects 3 Modem attempts normal connection. 4 Modem attempts MNP connection. 7 Modem attempts MNP connection. If it fails, modem attempts normal connection. FLASH DIAL MODIFIER TIME Format AT [cmds] S29=n [cmds] Example: ATS29=0 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 DISPLAY Format AT [cmds] S39? [cmds] Example: ATS39? Default: Read-only Range: 0, 3 - 6 Unit: None Stored: N/A Description: Contains the current flow control. Value Meaning 0 Flow control is disabled. » 3 RTS/CTS flow control is enabled. 4 XON/XOFF flow control is enabled. 5 AFT XON/XOFF flow control is enabled. 6 RTS/CTS and XON/XOFF flow control enabled. FLOW CONTROL CHARACTER - XOFF Type: Register Format: AT [cmds] S33=n [cmds] Example: ATS33=20 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=20 Default: 17 Range: 0-255 Unit: ASCII Description: Sets the character used to represent XON. LEASED LINE RECEIVE LEVEL DISPLAY Type: Immediate Format: AT [cmds] %L [cmds] l Example: AT %L &W Description: Displays signal level for reception when in leased-line mode. MAXIMUM BLOCK SIZE FOR TRANSMISSION Type: Configuration Format: AT [cmds] \An [cmds] Example: AT \A3 %C1 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. 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. NEGOTIATE LINE SPEED Type: Configuration Format: AT [cmds] %Q [cmds] Example: AT %Q &W Description: Displays signal quality. SLEEP TIMER Format AT [cmds] S24=n [cmds] Example: ATS24=40 Default: 0 Range: 0 - 255 Unit: 1 second Description: Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.