Serial Port Communication problem in windows 7 64 bit

pkkrao

Hi,
We have a device which will communicate the application through com port.We are able to send commands to the device and receive responses from the device.But recently we upgraded to windows 7 64 bit machines we are facing weird problem.The data is never received in this mode of machine.In other words the OnReceive event or OnComm event never fires in windows 7 64 bit machine.It works fine in xp and windows 7 32 bit machine.We tried the serial port communicatin using .Net serial port class and some third party tools and even with the hyperterminal.We only have receive problem.

We tried all options such as
1)Installing with admin privilleges.
2)Regitering controls.
3)Enabling Rtstrheshold and rts to receive data but all failed.
4)Updated drivers.

Please can any one suggest some steps to work out this scenario in windows 7 64 bit machine.

Thanks
Pkkrao.

3 Replies

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Sam Hobbs14y ago
Perhaps you do not understand what I mean by "platform target". So I can be sure you understand, can you tell me how you specify the platform target?
pkkrao14y ago
yes the platform is 32 bit.I dont have problem in 32 bit.But only in 64 bit and only receive problem
Sam Hobbs14y ago
I have one suggestion. Have you changed the platform target to x86 for the project? In other words, are you sure you are using 32-bit? If that works, then you can diagnose why 64-bit is a problem. You probably can just leave it as 32-bit if it works.