Error trying to use Serial Port connection
I have a serial device that up until today was working fine.
This is a constant feed from a scale to a serial port on the back on the PC.
I am using Windows XP SP3
I can get the feed to work just fine through Terminal Operator, but not in the Application this feeds into.
--------------------
The Application it feeds into is a program written in VFP6
The error I am getting is :
Run-time error '8015':
Could not set comm state, there may be one or more invalid communications parameters.
--------------------------
I have searched online and some people thought it was a Printer Driver issue. I tried uninstalling ever Printer and Printer driver but that did not help.
I also did a full uninstall of the serial Comm Ports and then did a reboot to reinstall them but that did not work as well.
Any ideas what else I can try?
This is a constant feed from a scale to a serial port on the back on the PC.
I am using Windows XP SP3
I can get the feed to work just fine through Terminal Operator, but not in the Application this feeds into.
--------------------
The Application it feeds into is a program written in VFP6
The error I am getting is :
Run-time error '8015':
Could not set comm state, there may be one or more invalid communications parameters.
--------------------------
I have searched online and some people thought it was a Printer Driver issue. I tried uninstalling ever Printer and Printer driver but that did not help.
I also did a full uninstall of the serial Comm Ports and then did a reboot to reinstall them but that did not work as well.
Any ideas what else I can try?
ASKER CERTIFIED SOLUTION
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Okay. Sometimes the addressing of the COM port can get jacked up. You may have already looked at this but make sure your ports are set to the default values. The following list is the defaults:
COM1 - 3F8 IRQ4
COM2 - 2F8 IRQ3
COM3 - 3E8 IRQ4
COM4 - 2E8 IRQ3
This article explains how to make those settings changes in XP:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/devmgr_changing_port_settings.mspx?mfr=true
COM1 - 3F8 IRQ4
COM2 - 2F8 IRQ3
COM3 - 3E8 IRQ4
COM4 - 2E8 IRQ3
This article explains how to make those settings changes in XP:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/devmgr_changing_port_settings.mspx?mfr=true
ASKER
Replaced COM port and it is working now. I guess it was a bad COm port. Strange that there was a feed at all.
Glad I could help. If this is a mission-critical system, you can run shielded cable and ground the end on the PC side to ensure a transient voltage spike doesn't kill your COM port.
ASKER