Autonics BFC Series, User Manual

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1 Modbus RTU protocol
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1.2 Read Input Status(Func 02–02H)
Reads Input ON/OFF status(1X reference) in Slave device.
(1) Query (Master)
Slave Address Function
Starting Address No. of Points Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
(2) Response (Slave)
Slave Address Function Byte Count
Data
(Data)
Data
(Data)
Data
(Data)
Error Check(CRC16)
Lo(Lower)
Hi(Upper)
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If reading the input status(ON: 1, OFF: 0) of 10 range 100001(0000 H)to100010(0009 H)in the
Slave(Address 17) from the Master.

Query (Master)
Slave Address Function
Starting Address No. of Points Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
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) to 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)
Lo(Lower)
Hi(Upper)
11 H 02 H 02 H CD H 01 H ## H ## H
CRC16
CRC16