Serial Communication (Loopback)

[Cadence2 0]

Hey Everyone, I'm writing an app to test whether a serial port on a computer will work correctly and I'm using the principle of serial loopback. I'm using the SerialPort class from System.io.ports and using a serial port object to write to the port and then listen to see if there was any data recieved. However, I always get a timeout for the recieve portion, even when I put the recieve method into a Thread. Any ideas what I should try? Thanks in advance -Karthik

[led mike]

Karthik Gaekwad wrote:

I'm using the principle of serial loopback

I don't think you can use a principle I think you have to actually have a loopback. :confused:

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

[Cadence2 0]

led Mike, You are correct. I am using loopback to solve the problem, but my recieve thread won't fire, even if I have the recieve wait for a message. Hope that clears it up. Any suggestions? -Karthik

[Cadence2 0]

And the solution is.... After you write to the port using a serial port object, use the readExisting method. DO NOT CLOSE THE PORT and then OPEN the port again to read. There is nothing stored in the buffer at that point. I can be so dumb sometimes. That's what I get for trying to modularize my program.

[led mike]

Nice work, thanks for posting the solution. :)