First, the two lathes should be connected with the provided wiring, to the RS485 ports:
After that, they should be configured as master and slave as follows:
You should also verify that the following parameters have these values:
F00 - M:0 / S: 1
F01 - M: 1/0 / S: 0/1
F23 - M: 15 / S: 15
F29 - M: 0 / S: 0
F33 - M: 0/0 / S: 0/0
Finally, the system should be restarted.