Autonics TK Series - Read Holding Registers(Func03-03 H)

Autonics 1 Modbus RTU Protocol
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1.3 Read Holding Registers(Func03–03H)
Read the Binary data of Holding Registers(4X reference) in Slave device.
(1) Query(Master Side)
Slave Address Function
Starting Address No. of Points Error Check(CRC16)
High Low High Low Low High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
(2) Response(Slave Side)
Slave Address Function Byte Count
Data Data Data Error Check(CRC16)
High Low High Low High Low Low High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If read the value of 2EA within Holding Register 40001(0000 H)~40002(0001 H) on Slave
side(Address 17) from the Master side.
 Query(Master Side)
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
If the values of 40001(0000 H) and 40002(0001 H) on Slave side are respectively
“555(22B H)” and “100(64 H)”.
 Response(Slave Side)
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