TRB140 modbus communication error

hello

i am trying to run this script on trb140 (fw version TRB1_R_00.07.12) but it returns “communication error” message

any explanation about it please

thanks

hello

about the issue i mentioned i want to tell that it is resolved and the problem was in the PLC that i wanted to communicate with, (i accidently disabled the modbus communication in PLC side and i didn’t pay attention )

but i still have another issue, (sorry i am a beginner with teltonika environment)

i couldn’t execute a custom script via sms utility, while i can execute it via the CLI terminal