I'm attempting to use your Modbus module to communicate over my RS-485 network, but I am not getting any communications. What could be wrong?

I'm attempting to use your Modbus module to communicate over my RS-485 network, but I am not getting any communications. What could be wrong?

The module is shipped from the factory with the port configuration jumpers in the RS-232 communication mode. Check that your module's port jumpers have been changed to RS-485 mode.