Autonics SPR Series, Руководство пользователя по связи

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1 Modbus RTU Protocol
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1.2 Read input status (Func 02–02H)
Read Input ON/OFF status (1X 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)
Low High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If read the 10 input status (ON: 1, OFF: 0) within range 100001 (0000 H) to 100010 (0009 H) in
the 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 02 H 00 H 00 H 00 H 0A H ## H ## H
If the values range 100008 (0007 H) to 100001 (0000 H) on Slave are “ON-ON-OFF-OFF-ON-
ON-OFF-ON”, and the values of 100010 (0009 H) and 100009 (0008 H) are respectively “OFF-
ON”.

Response (Slave)
Slave address Function Byte count
Data
(100008 to
100001)
Data
(100010 to
100009)
Error check (CRC16)
Low
High
11 H 02 H 02 H CD H 01 H ## H ## H
CRC16
CRC16