1 Modbus RTU Protocol
12
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1.3
Read Holding Registers(Func03–03H)
Read binary data of Holding Registers (4X reference) on Slave device.
(1)
Query(Master)
Slave Address
Function
Starting Address
No. of Points
Error Check
(CRC16)
High
Low
High
Low
Low
High
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
(2)
Response(Slave)
Slave Address
Function
Byte Count
Data
Data
Data
Error Check
(CRC16)
High
Low
High
Low
High
Low
Low
High
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
1
Byte
The example of reading 2 values within Holding Register 400001(0000 H) to 400002(0001 H) on
Slave(Address 17) from Master.
Query(Master)
Slave Address
Function
Starting Address
No. of Points
Error Check(CRC16)
High
Low
High
Low
Low
High
11 H
03 H
00 H
00 H
00 H
02 H
## H
## H
The example when 400001(0000 H) value is “555(22B H)”, 400002(0001 H) value is “100 (64 H)”
on Slave.
Response(Slave)
Slave Address
Function
Byte Count
Data
Data
Error Check(CRC16)
High
Low
High
Low
Low
High
11 H
03 H
04 H
02 H
2B H
00 H
64 H
## H
## H
CRC16
CRC16
Summary of Contents for TF3 Series
Page 1: ...Preface Copyright Reserved Autonics Co Ltd 1 USER MANUAL For COMMUNICATION ...
Page 2: ...Preface 2 Copyright Reserved Autonics Co Ltd ...
Page 28: ...2 Modbus Mapping Table 28 Copyright Reserved Autonics Co Ltd ...
Page 29: ...2 Modbus Mapping Table Copyright Reserved Autonics Co Ltd 29 MCT TF3C1 V1 1 1701US ...
