User Manual
Table Of Contents
Chengdu Ebyte Electronic Technology Co., Ltd. E108-D01 User Manual
Copyright ©2012–2022, Chengdu Ebyte Electronic Technology Co., Ltd.
9
4. Modbus Register
4.1 Communication Protocol
The protocol layer of the GPS/BDS positioning module is a standard Modbus communication protocol, which conforms
to the national standard GBT 19582.1-2008 "Industrial Automation Network Specification Based on Modbus Protocol".
It adopts the Modbus RTU communication protocol, and return data according to the parsing result by receiving and
parsing the frame data on the data bus.
The frame format is as follows:
4.2 Register description
The following table describes the specific meaning of the decimal registers and the function codes used for operation.
Register
Read function
code (HEX)
Write function code
(HEX)
Channel example
[Area 1] Discrete Input Register
02
——
10001, indicating the DI1 register
address
[Area 0] Switch output register
01
05
0F
00001, indicating the DO1 register
address
[Area 3] Input register
04
——
30001, means address 1 of zone 3
[Area 4] Holding Registers
03
06
10
40001, indicating address 1 of area 4
【Note】This device will only use the register address of zone 4 (that is, the holding register).
4.3 Register table
Register Function
Register Address
Data
Format
Data Range/Remarks
(Decimal)
(Hex)