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Couldn't open port - modem error

By Lynne ·
I get the error message "Couldn't open port" when I run the modem diagnostics on my ISA PNP US Robotics 56K internal fax modem. I have Com 1 & 2 installed and the modem is on Com 3. The diagnostics ran okay when I first installed it, but upon reboot, I get this error. Actually, I got this error the first time I installed it, then removed the modem (both from system properties & physically) reboot, removed com 1&2, installed the modem, physically, then reboot. Win 98se installed all three and the modem appeared to be working. Upon reboot, I get the Couldn't open port error. What next?

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Couldn't open port - modem error

by 1stladytech In reply to Couldn't open port - mode ...

The easiest thing to do is to hard set the modem to com2 with the jumpers onboard. Then set your cmos and onboard com ports to 1 and 3 (so they will share an irq and leave the modem alone). Generally, you get the "couldn't open port" message if something else is also using the irq (do you have a Palm Pilot on com1?) You can also try turning off either one or both of the onboard com ports to check the modem

Vickie

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Couldn't open port - modem error

by Lynne In reply to Couldn't open port - mode ...

Well, that would work if there were jumpers on the modem....

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Couldn't open port - modem error

by LiQuiDKeWL In reply to Couldn't open port - mode ...

What is happening is that you are getting an IRQ conflict. Seeing that it has installed it on Com3 and knowing that Com1 and Com3 share the same IRC port (IRQ 4) your best bet is (If you don't use Com 1 ) to disable Com 1 in your Bios, Remove the modem and then reboot into Safe mode. go into Control Panel and System and remove all of the Com port that are listed under "Communication Ports", then shut down the PC. Place the Modem back in. Do NOT re enable the Com port, leave it disabled. Once windows loads up it should detect the modem and the com ports that are available. If it does not do it automatically, go to Add/Remove Hardware and get it to auto detect.

Hope that helps you.

Cheers ....

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Couldn't open port - modem error

by Lynne In reply to Couldn't open port - mode ...

This worked. Thanks. Unfortunately, I lost my LAN connection immediately after implementing this solution and haven't been able to get it back......
Sigh. Isn't technology wonderful?

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Couldn't open port - modem error

by jimjennings In reply to Couldn't open port - mode ...

You didn't mention what operating system you are running, but since it is a PNP modem I would guess that it is one of the windows choices. The device manager will tell you what the problem is if it is related to address conflicts, but you may have asoftware problem. Try installing a diferent modem to see if the modem is dead. If the device manager does not list any conflicts check the task manager to see what programs are running that could be opening com ports for other devices, and you may even check to see if there are entries in autoexec.bat or config.sys (if you have those files)that try to load devices to your com ports. You may even check the CMOS settings for com port assignments, and see if there is a setting for PNP operating system that will allow dynamic addressing.

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Couldn't open port - modem error

by Lynne In reply to Couldn't open port - mode ...

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Couldn't open port - modem error

by Lynne In reply to Couldn't open port - mode ...

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