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9 Communication
9.4 Modbus Protocol
00 64 indicates the register address. It is the value of D1.
00 01 indicates the number of registers. It is the value of D2.
C5 D5 indicates the CRC code.
If the slave is an H3U PLC, select the Modbus-RTU slave station protocol. The ladder chart is as follows.
The following gure shows conguration of a slave station.
The slave correctly returns the frame (hexadecimal) 01 03 02 51 00 85 D4.
The slave sends the value of D100 (the register address is H0064) to the master.
01 indicates the slave address.
03 indicates the Modbus instruction code.
02 indicates 2-byte valid data returned.
51 00 indicates register data. It is the value of D100.
85 D4 indicates the CRC code.
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