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How to do Modbus RTU protocol settings in REL52813 and REL52814 (VIO 12AC/AD).
The REL52813 / REL52814 (VIO 12AC/AD) module's address is set with DIP switches. The available address range is 1–247. If RS-485 interface is used and there are multiple REL52813 / REL52814 modules
(or other external I/O modules) connected to the same RS-485 bus, then each module has to have a unique address. The termination must be on in the last module of the RS-485 bus structure.
The baud rate is fixed to 9600 b/s, and the parity is Even.

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