VB.net+System.IO.Ports.SerialPort+Third part class RS232.vb

Question

Currently, we are using the third part class RS232.vb and test program running well,  but when we changed the communication to System.IO.Ports.SerialPort, the problem happens. For example, we write the same command with RS232.vb and System.IO.Ports.SerialPort respectively, but the received data is different:

RS232:       1,3,8,13,132,12,131,12,112,12,134,63,82,82,192,13,10

System.IO: 63,63,1,3,8,13,132,12,131,12,112,12,134,63,82,82,192,13,10

There are always some "63" received at the begin of the data, sometimes 1 "63", sometimes 2 "63" and sometimes 3 "63".

Can someone tell me why there is "63" happens at the begin of the received data?  Thanks.

The RS232.vb code is attached as below:

Answer 1

Hi Midywei,

Welcome to the MSDN Forum.

It seems that you have miss the code.

But I suggest you check the third part class first, to find out how it handle the input and the output data. The number 63 looks like a sign.

Best regards,

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Mike Feng [MSFT]
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