With no experience with Modbus, I'm creating a python script running on a slave computer receiving Modbus RS485 data from master ( a Siemens control computer). Then store it into a text file.
The whole system is on a ship which is not so convenient to reach. Therefore, I want to be able to simulate it in an office, using 2 computers and some connectors probably? Some advice? Thank you very much.
Give the pymodbus package a try and get some USB-modbus adapters so that you can try loop-back tests. Just be careful to find adapters that support both slave and master modes of operation.