PET-AR400 User Manual
V1.0.0
P.54
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
Description
Parameter
Data Type R/W Default
34
1
IEPE input data high/low
WORD arrangement
0
：
Big endian
1
：
Little endian
1
R/W
0
36
1
Clear reboot count
1
：
Reset
1
W
-
40
1
Set the AI Data format
0
：
2’s comp HEX
1
：
Engineering Format
1
R/W
-
112
1
Reboot the module
1
：
Reboot
1
W
-
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 …
0x12
0x34
0x56
0x78
…
a
a+1
a+2
a+3
In
Little Endian
, the same number is represented as:
Memory …
0x78
0x56
0x34
0x12
…
a
a+1
a+2
a+3
