I am trying to communicate a control board using realterm with hardware flow control set as 'RS 485-rts'. How can I have it implemented in windows serial port ?

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I'm using below codes,

port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.Encoding = System.Text.Encoding.ASCII;
port.Name ="COM1";
port.BaudRate=9600;
port.DataReceived += Port_DataReceived;

And while sending commands to Board,

port.RtsEnable = true;
port.Write(System.Text.Encoding.ASCII.GetBytes(dataToSend), 0, dataToSend.Length);
Thread.Sleep(15);
port.RtsEnable = false;

What I have tried:

I have tried using RealTerm, and I'm getting correct response all the time, I'm also getting correct response from above codes but some of the time its returning garbage which is not a case while sending from RealTerm.

Posted 25-Apr-19 22:42pm

Shrikant S

Updated 26-Apr-19 5:23am

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Richard MacCutchan 26-Apr-19 5:02am

You need to show the code where you are receiving garbage, and explain exactly what is happening.

Shrikant S 26-Apr-19 5:29am

Its the same codes I'm using to send commands that's mentioned above. I'm receiving garbage in 'Port_DataReceived' event. I'm supposed to recieve '11111' but I'm getting 'RRSSS'. Its almost 1 out of 5 times only that I'm getting this garbage.

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Gerry Schmitz · Answer 1 · 2019-04-26T05:23:00

Solution 1

It's called: "defensive programming"

Quote:
The DataReceived event is not guaranteed to be raised for every byte received. Use the BytesToRead property to determine how much data is left to be read in the buffer.

Posted 26-Apr-19 5:23am

Gerry Schmitz