SerialPort delay problem

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Hello,

I am trying to synchronize the clocks of 2 external devices down to 1/10th of a second using C# and the .NET System.IO.Ports.SerialPort class.

I send a command and wait for a response. I divide the time it takes to get the first byte of the response by 2, and send a command to the device to set its clock with the delay added on to the computer time. I then repeat the process on the other device. I can then take a picture of a digital readout of the time, and the clocks are never the same, sometimes differing up to 100ms.

I printed out a detailed account of the communications (what I sent and when) with the devices, and that all checks out. So my question is: does the SerialPort have a significant delay when receiving or sending data? Did I get data, and then only know about it 20ms later?

PS, I am checking SerialPort.BytesToRead and not using the dataReceived event.

Posted 12-Mar-12 12:00pm

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Shahin Khorshidnia · Answer 1 · 2012-03-12T12:49:00

Hello
Does the SerialPort have a significant delay when receiving or sending data?Did I get data, and then only know about it 20ms later?
The Short answer is No. There is not any specified time.

I am checking SerialPort.BytesToRead and not using the dataReceived event.
maybe this helps, Look at this please:
http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.datareceived.aspx[^]