How to handle the timeout issue in c#-serial port communication application.

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Hi,
I have an application that needs to be send responses within 80ms. As the receiver side application is so time critical, it causes timeout exception hence all the operations are failed.
I am working with baud rate of 10400 bps. I have used Serialport.ReadTimeOut and SerialPort.WriteTimeout functions for setting timeouts.
and the time out set were 6s and 1ms respectively.

Is there any wy to speed up the serial port communication. Plz help
Is it possible to use WIN32 API in C#.net?

Posted 27-Aug-14 2:52am

Utheen

Updated 28-Aug-14 20:03pm

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gggustafson 27-Aug-14 9:43am

Timeouts on a serial port are caused by a number of items: baud rate at BOTH endpoints; timeout settings at BOTH endpoints; the amount of data being passed (remember there is usually an MTU involved); whether or not "Nageling" is occurring; the load on each endpoint machine (if one gets bogged down its response will increase); load on the network (if a network is used). The solution may be that you need to build a device driver for your application. Or drop down into the Win32 API (.Net Framework can add lots of time-consuming operations).

You should collect some data. You could use ping to determine the connection speed. It may be that you are sending too much data.

Good luck

Utheen 27-Aug-14 10:15am

Thank you so much, will try to use WIN32API.

S Houghtelin 27-Aug-14 13:42pm

What device are you using that uses a baud rate of 10400? 10400 is a non-standard rate and may very well be the reason you are having issues. 80ms is more than enough time for a response after a receive event. The .net serialports has it's issues but none that I've come across that couldn't be overcome including high throughput data rates.

Perhaps you could post some of the code you are using, perhaps there is a setting you are overlooking.
Regards

Utheen 29-Aug-14 2:02am

I tested this code with standard baud rate of 9600, but the timeout exception occurred again.
Our application at the receiving end shows the No response error due to system.Timeout exception.

gggustafson 29-Aug-14 11:10am

We need the exact error, not a paraphrase. We also need to see the code where the exception occurs.

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Utheen · Accepted Answer · 2014-09-24T20:48:00

while (bytesRcvd<<bytesexpd)>
{

bytesRcvd+= serialPort.Read(rdBytes, bytesRcvd, bytesExpd- bytesRcvd);

}
bytesExpd= (int)rdBytes[1];
while (bytesRcvd<bytesexpd)>
{

bytesRcvd+= serialPort.Read(rdBytes, bytesRcvd, bytesExpd- bytesRcvd);

}