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5.3. Modbus Register Map
The tables below are intended to be used as a reference for users who need to communicate with
the PET-AR400 over a Modbus network.
Coil Register (0xxxx) address table
Register Points
IEPE input data high/low
34
1
WORD arrangement
36
1
Clear reboot count
40
1
Set the AI Data format
112
1
Reboot the module
Tips & Warnings
The PET-AR400 is bi-endian in that it supports byte ordering in both little endian
and big endian. The byte ordering can be defined by the value in register 00034.
For example, consider a 32-bit data with a hexadecimal notation of 0x12345678.
The number is 4 bytes wide.
In Big Endian, this number is represented as:
Memory ...
In Little Endian, the same number is represented as:
Memory ...
PET-AR400 User Manual
Description
0：Big endian
1：Little endian
1：Reset
0：2's comp HEX
1：Engineering Format
1：Reboot
0x12
a
0x78
a
V1.0.0
Parameter
0x34
0x56
a+1
a+2
0x56
0x34
a+1
a+2
Data Type R/W Default
1
R/W
1
W
1
R/W
1
W
0x78
...
a+3
0x12
...
a+3
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