Multi-Tech Systems ISIHP-4SD, ISIHP-4U MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 143

Troubleshooting

disconnect without ending the program (make sure the Connect icon looks plugged in). MultiExpress Terminal also allows multiple terminals to be open, but only one can access the modem/TA at a time.

•Your communications software settings may not match the physical port where the TA is connected. The serial cable may be plugged into the wrong connector—check your computer documentation to make sure. Or, you may have selected a COM port in your software other than the one where the TA/modem is connected—compare the settings in your software to the connection.

•Peripheral expansion cards, such as bus mouse and sound cards, may include a serial port preconfigured as COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory address, or interrupt request (IRQ) as your communications port. Be sure to disable any unused ports.

To look for address or IRQ conflicts if you use Windows 3.1x, select File then Run in Program Manager. Type MSD and press ENTER. Then select Mouse, COM Ports, and IRQ Status and note the addresses and IRQs that are in use. If you find an IRQ conflict, note which IRQs are not being used, then change one of the conflicting devices to use one of the unused IRQs. If you find an address conflict, change the address of one of the conflicting devices.

To change a port address or IRQ in Windows 3.1x, double-click the Control Panel icon and then the Ports icon. Click the port you want to change; then click Settings and then Advanced and select the new port address and/or interrupt. If you want to use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4 with COM2, so you should change their IRQs to unused ones if possible.

If you use Windows 95, right-click My Computer and select Properties. Click the Device Manager tab and then double-click Ports. Double-click the Communications Port where your modem/ TA is connected. In the port’s Properties sheet, click the Resources tab to view the port’s Input/Output range and Interrupt Request. If another device is using the same address range or IRQ, it appears in the Conflicting Device List. Remove the check from Use Automatic Settings to change the port’s settings, so they do not conflict with the

MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 143