Hitachi WJ200-001L, Instruction Manual

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Ver.3
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Holding register big endian
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Little endian select
The purpose of this document is to explain what Endians are and how they work. After reading this
document, you can configure the Endian setting for Modbus communications for your purposes.
Endian means how data are arranged in a particular order.
There are three kinds of Endians: Big endian, Little endian and Special endian.
[ Setting range ]
Item Function code Data Description
Endian Setting P400
00 Big Endian (Default)
01 Little Endian
02 Special Endian
Constraint:
Only data in Queries and Responses are subject to this Endian function.
Therefore Coils, register addresses and function codes are not affected by this function.
When any Endian setting is changed, either power cycle or reset is required for the change to become
effective.
[1]Communication command that can be used by this function
The list of the communication that can use this function is shown below.
Table: Modbus communication command (RS485, USB)
No Modbus Function Code Function name
1 03H Read Holding Resister
2 06H Write in Holding Register
3 10H Write in Registers
4 17H
Read/Write Holding
Register