Autonics TK Series - Read Input Registers(Func04-04 H)

1 Modbus RTU Protocol Autonics
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1.4 Read Input Registers(Func04–04H)
Read the Binary data of Input Registers(3X 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)
Low High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If read the value of 2EA within Input Register 30001(0000 H)~30002(0001 H) on Slave
side 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 04 H 00 H 00 H 00 H 02 H ## H ## H
If the values of 30001(0000 H) and 30002(0001 H) are respectively “10(A H)” and “20(14
H)”.
 Response(Slave Side)
Slave Address Function Byte Count
Data Data Error Check(CRC16)
High Low High Low Low High
11 H 04 H 04 H 00 H 0A H 00 H 14 H ## H ## H
CRC16
CRC16