Multitech MT2834ZDX Specifications download pdf (Page 73)

5 Solving Problems

tialization string includes &F as the first command, to cancel any

“leftover’ command that could affect the modem’s operation.

If you don’t get an

, the problem may still be in the communica-

tion program. Make sure you have done whatever is necessary in

your software to make a port connection. Not all communication

programs connect to the COM port automatically. Some connect

when the software loads and remain connected until the program

terminates. Others can disconnect without exiting the program. The

modem’s TR indicator lights to show that the software has taken

control of the modem through the COM port.

Your communication program settings might not match the physical

port the modem is connected to. The serial cable might be plugged

into the wrong connector—check your computer documentation to

make sure. Or you might have selected a COM port in the program

other than the one the modem is physically connected to—compare

the settings in the program to the physical connection.

If the modem is on, the cable is plugged into the correct port, the

communication program is configured correctly, and you still don’t

get an

, the fault might be in the serial cable. Make sure it is

firmly connected at both ends.

Is this the first time you have used the cable? If so, it may not be

wired correctly. Check the cable description on the package to

make sure the cable is the right one for your computer.

Peripheral expansion cards, such as sound and game cards, can

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 | Run in Program Manager, type MSD, and press ENTER.

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Multitech MT2834ZDX Specifications Page 73