CODESYS Forge - CODESYS Forge / Talk / Engineering 🇬🇧: Send a Value (Double) with TCP IP Client Server

Hello every one. I could send data with TCP IP client Server to the server. (Thanks to this forum)
Now I have problem that i need to send a double value for example 70.0000 but server recieve it 70 not 70.000 Therfore it can not be detected by server.

Clinet_Tx1         : ARRAY [0..gvlSetting.gc_wMaxTelegram] OF 
BYTE;

Clinet_Tx1[0] := 128;
Clinet_Tx1[1] := 9;
Clinet_Tx1[2] := 0;
Clinet_Tx1[3] := 0;
Clinet_Tx1[4] := 140;
Clinet_Tx1[5] := 16;
Clinet_Tx1[6] := 0;
Clinet_Tx1[7] := 0;
Clinet_Tx1[8] := 70;
Clinet_Tx1[9] := 0;
Clinet_Tx1[10] := 0;
Clinet_Tx1[11] := 0;
Clinet_Tx1[12] := 0;
Clinet_Tx1[13] := 0;
Clinet_Tx1[14] := 0;
Clinet_Tx1[15] := 0;
// 0...3 Massage.Header 
// 4..7 Address
//8 ..15 Value (8 Byte- Double precision)
// Data uses little-endian format

How can I fix it?

Last edit: David.sa198 2021-09-09

Thomas - 2021-09-09

Hey David,
see: https://faq.codesys.com/display/CDSFAQ/TCP%3A+Example+for+Server+and+Client

Regards

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- David.sa198 - 2021-09-09
  
  Thank you for your reply. Can I use CAA Netbase service with Raspberry Pi. Does R.Pi support this service?
  
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Ton - 2021-09-09

To convert this number to bytes you can use an Union.
TYPE UN_Test :
UNION
dwValue: DWORD;
arrValue: ARRAY[0..3] OF BYTE;
END_UNION
END_TYPE

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DoubleToBytes.PNG

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Send a Value (Double) with TCP IP Client Server