![]() ![]() The difference between these two quantities is “offset”.Įach table has its own offset, respectively: 1, 10001, 3001. The Modbus message uses the register address.įor example, the first register of AO Holding Register has the number 40001, but its address is 0000. Two tables are read-only and two are read-write. SlaveID is the address of the device, it can take a value from 0 to 247, addresses from 248 to 255 are reserved.ĭata in the module is stored in 4 tables. If you discard the SlaveID address and the CRC checksum, you get the PDU, Protocol Data Unit. The Modbus RTU message consists of the address of the SlaveID device, the function code, the special data, depending on the function code and the CRC of the checksum. It uses RS-485, RS-422, RS-232 interfaces, as well as Ethernet TCP / IP networks (Modbus TCP protocol) for data transfer. Modbus -communication protocol is based on the master-slave architecture. Equipment with Modbus RTU support Modbus RTU protocol description.Programs for working with Modbus RTU protocol.What are the errors of the Modbus request?.How can I send a Modbus RTU command to record multiple analog outputs? Command 0x10.How can I send a Modbus RTU command to write multiple discrete pins? Command 0x0F. ![]() How can I send a Modbus RTU command to record analog output? Command 0x06.How can I send a Modbus RTU command to write discrete output? Command 0x05. ![]()
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