Estun pronet series - MODBUS Communication Protocol Details

ProNet Series AC Servo User's Manual
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6.3 MODBUS Communication Protocol
MODBUS communication protocol is only used when Pn700.2 is set to 1. There are two modes for MODBUS
communication: ASCII (American Standard Code for information interchange) mode and RTU (Remote Terminal Unit)
mode.
The next section describes the two communication modes.
6.3.1 Code Meaning
ASCII Mode：
Every 8-bit data is consisted by two ASCII characters. For example: One 1-byte data 64 H（Hexadecimal expression）is
expressed as ASCII code ‘64’, which contains ‘6’ as ASCII code 36
H
and ‘4’ as ASCII code 34
H
.
ASCII code for number 0 to 9、character A to F are as follows:
Character ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’
ASCII Code 30
H
31
H
32
H
33
H
34
H
35
H
36
H
37
H
Character ‘8’ ‘9’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘F’
ASCII Code 38
H
39
H
41
H
42
H
43
H
44
H
45
H
46
H
RTU Mode：
Every 8-bit data is consisted by two 4-bit hexadecimal data, that is to say, a normal hexadecimal data. For example:
decimal data 100 can be expressed as 64
H
by 1-byte RTU data.
Data Structure：
10-bit character form（7-bit data）