MaxTech 800, 28 user manual COM Port and Interrupt Settings

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Panel, double-click on Ports. Click once on the icon for the Com port you have set your modem to. Click the Settings button. Click the Advanced button. The Base I/O Port Address should already be set by Windows to the COM port address used by the modem (refer to Table 2-1). Change the Interrupt Request Line (IRQ) to match the IRQ on the modem. If you have set the modem to COM4/IRQ2, do not select IRQ2. You will need to set the IRQ in Control Panel to IRQ9 for Windows to recognize the modem. (In an operating system designed for 286 or better machines, IRQ 9 is equivalent (redirected) to IRQ2.)

A modem setting which skips one or more COM port assignments requires special attention in the Windows 3.x Control Panel. For example, if your computer is equipped with two serial ports (COM1 and COM2) and have set the modem to COM4 instead of COM3, the Control Panel settings for COM4 may say Default. In this case, Windows 3.x will operate the modem as the third serial device and recognize it as “COM3” (This unusual COM port reassign- ment does not occur in future releases of Windows). The correct COM4 address (2E8) has been placed into the Control Panel COM3 position. Configure the COM3 entry in Control Panel by changing the IRQ box to match the IRQ that has been set on the modem. (When running any Windows 3.x-based communication or fax programs, select COM3 as the COM port for the modem.)

We suggest the following communication parameters when you first use your data communication software. Consult the software manual for information on using these and other parameters/features.

38,400 bps; 8 data bits; no parity; 1 stop bit; RTS/ CTS flow control set to “on;” initialization string: AT&F

We suggest that a “ Generic Class 2” modem type should be selected in your fax software.

2.4 COM Port and Interrupt Settings

If your computer is equipped with one or more serial ports, you will need to change the COM Port setting on the modem (to either COM 3 or 4), or disable the PC's built-in COM port.

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Contents MAN018 Rev Section Two Installation Hardware InstallationSection One Introduction Unpacking Your ModemCommon Serial Ports Male connector Software Installation/ConfigurationCOM Port and Interrupt Settings SW1 Settings Devices in your computer cannot share an IRQ withUsing the Fax Capabilities of the Modem Testing Your Modem After InstallationUsing Your Modem Where To Go From HereExecuting Commands Command StructureBasic AT Commands Bold text Command FunctionCommands are echoed Low speaker volumeTouch-tone dialing DS=nExtended AT Commands Guard tone disabled Modem is set up for dial-up line operationDisable originate-only mode US setting for off-hook-to-on-hook ratioMNP/V.42/V.42bis Commands Section Four S Registers S Registers Function Range/units Default Section Five Result CodesExtended Response Codes Connect 19200/V42BIS Section Six Troubleshooting Modem does not respond to commandsModem does not dial Modem dials but does not connect42bis/V.42/MNP2-5 does not work Modem makes a connection but no data appears on your screenHigh pitch tone is heard whenever you answer the phone Section Nine FCC , DOC & Other Notices Section Eight Support and ServiceFCC Compliance FCC Class B Statement DOC Compliance InformationDisclaimer, Copyright, And Other Notices
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