Morningstar RELAY DRIVER Manuel D'installation, D'utilisation Et D'entretien page 38

Setup
1. From the Relay Driver Setup screen, choose either Simple or
Advanced setup.
2. Select MODBUS Slave from the Function list, then click Finish.
The channel is now configured for MODBUS Slave.
If all four channels are configured as desired, refer to section 3.3 for
instructions on how to program the Relay Driver.
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