PACA rs232 pecularity

I try to connect PACA with third party controller using it's RS232 port

I have the most simple code:
----
Initialisation
OpenSerial(2, 2, 9600, 8, 1, scNoFlowControl, scNoParity);

Module
once (GetLightingState("test") = ON) then
begin
WriteSerial(2, '0304on'#13#10);
end;

once (GetLightingState("test") = OFF) then
begin
WriteSerial(2, '0304off'#13#10);
end;
----

Strange thing is that it works perfect, while in PICED operation mode with computer COM port 2.

When uploaded to PACA it works only first time when I change group "test". It sends normal command. But after that it only sends this first command ok, but not second. For example if I turned "test" ON, 0304on is sent. Then I turn "test" OFF - nothing happens, turn ON again - 0304on. And vice-versa, if first command after PACA loads it "test OFF" then only 0304off is sent fine, cannot get 0304on.

could anyone explain, why does this happen, how can I change it? thank you!

UPD:
PS. It looks like second command is being sent, but somhow it's different from the first one, so receiving controller does not understand it...

 

Hello Nick
I was looking at your post hoping to learn something and I was wondering if the CR and LF needs to be '#13'.
I think I remember needing the extra appostrophies.
WriteClientSocket(1, 'Q0,2,-,-'#13'');

 

Putting the #13 within the apostrophes will result in the characters '#', '1' and '3' being sent, which is not what is required.