Good morning,

I am new in PLC programming and I am solving problem with communication via ethernet. I am using TCON, TSEND and TRCV for this.

My TCON is ok, I can connect to external device, but device take type of string, which is not working. For "start" device I should send <EOT>01G000<ETX>u When I try to send it like a string, it is not working. Should I convert it to something else, or how should I send it properly?

Thank you for help,

I include manual for device.

Hi Dufino,

Try sending Bytes instead of strings.

When using String the size of it is transfered too.

Regards,

Mambo_tech

Mambo_Tech

Hi Dufino,

Try sending Bytes instead of strings.

When using String the size of it is transfered too.

Regards,

Mambo_tech

This is a good guess.

I would suggest converting the STRING to an array of CHAR. There is an instruction to handle that. The array of CHAR can then be sent. (I am assuming you use 8-bit characters and not 16-bit characters.)

I tried to do this, but it is still not working, may you know what am I doing wrong?

Thank you for your time.

Thank you very much for your answers.

I did what you said (screens above), but still not working. I have not any error status.

Dufino

<EOT>01G000<ETX>u

 <EOT> and <ETX> are both special characters. It is not a string of 4 characters. The manual you presented to the forum does say which characters.

<EOT> is ASCII character 4. 
Assume #chars is an array of characters (CHAR).

#char[0] := '$4'; // End of Transmission character

Next follows that the checksum needs to be calculated and placed in the position where you now have a 'u'.  ....unless u is what the checksum worked out as.