258
RTU mode:
Data contents
(low byte is before
high byte)
The data contents are 0103H, the binary format is 0000 0001 0000 0011, write in
corresponding Y17~Y0, so Y0, Y1, Y10 are set ON.
Note: when writing the data contents, the low byte is before the high byte.
(6)Function code 10H: write multiple registers
Eg. Write 3 registers starting from address 0000H (D0).
RTU mode:
After executing, the value in D0, D1, D2 are 1, 2, 3.
Note: byte number = register number * 2.
Modbus-ASCII data structure
1. ASCII mode:
For Modbus ASCII(American Standard Code for Information Interchange)mode in serial
links, every 8-bit byte is sent as two ASCII characters. When communication links and
devices do not fit RTU mode timing monitor, we usually use the ASCII mode.
Note：One byte needs two characters, so ASCII mode has lower inefficiency than RTU mode.
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