Send Command to Com port using SerialPort.Write()

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I'm developing a software to comunicate to a access control device. I need, after meet some requirements, to send the following command: "##$01W#0001$0D$0A" to rs232 port using SerialPort.Write.

I've tried to send the command via Hercules Utility, just to check if the command is ok, and it works fine.
But my code doesn't seem to work at all. What am i doing wrong?

C#

SerialPort.Write("##$01W#0001$0D$0A")

Posted 6-Sep-12 6:40am

marco.constantino

Updated 6-Sep-12 6:49am

v4

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[no name] 6-Sep-12 12:44pm

You might try converting your ASCII string to bytes. 0D and 0A are hex codes for carriage returns and line feeds so you are probably not sending your code in the correct format.

Ed Nutting 6-Sep-12 12:45pm

Same thought at the same time aah... great minds think alike :)

Ed
(Or is it that fools seldom differ? ;p )

[no name] 6-Sep-12 12:48pm

Given a choice, I prefer GMTA... :-)

Ed Nutting 6-Sep-12 12:44pm

Have you got the correct Baud rate? That often causes problems. Also, check that the encoding the device uses for encoding/decoding the command is the same as the one you are using. Have you got a way of confirming that your access control device is working properly? Can you send it the command from anything else and get it to work? If so, perhaps inspect the command sent by said other program and compare it to your's?

Hope this helps,
Ed

Ganesh Nikam 7-Sep-12 23:50pm

need more details

2 solutions

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Amund Gjersøe · Answer 1 · 2012-09-06T07:39:00

Solution 1

As mentioned by Wes Aday and Ed Nutting:

C#

string s = "##$01W#0001$0D$0A";
byte[] data = Encoding.ASCII.GetBytes(s);
serialPort.Write(data, 0, data.Length);

Posted 6-Sep-12 7:39am

Amund Gjersøe

sachinkarche · Answer 2 · 2015-02-19T17:35:00

Solution 3

Please check this
$0D is special character and for this we need to be use "\r" (carriage return in C#
& for $0A is line feed "\r\n" need to be use from C# code..

Posted 19-Feb-15 17:35pm

sachinkarche

Comments

CHill60 20-Feb-15 8:51am

Wes Aday and Ed Nutting pointed this out over 2 years ago and Amund posted the solution over 2 years ago.