Com occupied ???

Pierre · Sep 15, 2004

Hummm.

Trying to connect a PLC software (Syswin 3.2) with com1 as I've done yesterday BUT...

I get a communication error "Device not open" message.

I check and have no other software running on this com...

But do I?

How can I get to know what is using the port?

I use a setup function in Winfax that detect the modems and it tells me that this port is used by another program.

How can I find what is using it?

OS is WXP Pro.

Imi'ike · Sep 15, 2004

Microsoft ActiveSync?

I experienced a similar problem trying to use COM 1 on my PC (WinXP) but with a different communication program. In fact, even Microsoft HyperTerminal won't work. At any rate, it turned out that Microsoft ActiveSync had "sole possession" of COM1. When I disconnected ActiveSync, my COM port was available again.

Pierre · Sep 15, 2004

I found it but ... then again.

Thanks Imi'ike I have disabled my Windows CE Active sync progam but it was not it.

It was X10nets.exe

I have installed a betta version of this new prgram to check on there supposed better conditionnal macros and when I terminate the processus I get my com port back.

The thing is that the software Active House Pro will only work with a USB connection. So why is it catching my com1?

I need to investigate further.

The question still stand:

How can I visuallise what is using which com port.

Preeya · Sep 15, 2004

I use WinXP pro and I have got similar messages but on other programs. You could try uninstalling COM 1 port on device manager & restarting the computer again.

Why don't you use some other COM?

Pierre · Sep 15, 2004

Preeya said:
Why don't you use some other COM?

Cause its myne!

jvdcande · Sep 16, 2004

Pierre,

I've had a similar experience. Here it was RSLinx which was occupying the port. The reason for this was thata RSLinx at installation is set to run as a service. I've changed it to run as an application in the launch control panel and have had no problems ever since then.

Kind regards,

Eric Nelson · Sep 16, 2004

Pierre said:
The question still stand:

How can I visuallise what is using which com port.

And that's a good question, Pierre. I Googled around a bit, looking for a program that would identify what application is using which COM port, to no avail...

In my searching, I DID find that a lot of people are looking for exactly the same thing. The 'solutions' provided are all the same. Trial and error until you find the culprit...

I find it amazing that a program like this doesn't appear to exist...

beerchug

-Eric

Paulus · Sep 23, 2004

Try this...

http://www.sysinternals.com/ntw2k/freeware/procexp.shtml

DesertDog · Sep 23, 2004

Just ran into RSLinx not giving up a port myself recently.

TimeFluxCap · Sep 24, 2004

RSLinx was messing wth my comm port last week too when I was trying to use CX Programmer for an Omron. Stopping the driver using comm port didnt work, had to delete!

wdry · Sep 24, 2004

Have you tried using one of the USB to com cables they work well for newer laptops that doesnt come with a com port about $45.00 USD at most computer shops, also you can as one of the others suggested change RSLinx to application rather than service

Com occupied ???

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