Autonics KPN Series, Руководство пользователя по связи, Страница: 11 / 26

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)
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)
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 values of 2EA, from Holding Register 400001(0000 H) to 400002(0001 H), in
Slave(Address 17) from the 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
If the value of 400001(0000 H) on Slave side is “555(22B H)” and the value of
400002(0001 H) is “100 (64 H)”.

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