1 Modbus RTU protocol
12
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1.4
Read Input Registers(Func 04–04H)
Reads the Binary data of Input Registers(3X 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
Error Check(CRC16)
Lo(Lower)
Hi(Upper)
1Byte
1Byte
1Byte
1Byte
1Byte
1Byte
1Byte
1Byte
If reading the values of 2 range from Input Register 300001(0000 H) to 300002(0001 H) on
Slave (Address 17) from 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
04 H
00 H
00 H
00 H
02 H
## H
## H
If the values of 300001(0000 H) on Slave is “10(A H)” and the values of 300002(0001 H) on
Slave is “20(14 H)”.
Response (Slave)
Slave Address Function
Byte Count
Data(Data)
Data(Data)
Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
11 H
04 H
04 H
00 H
0A H
00 H
14 H
## H
## H
CRC16
CRC16
Содержание BFC Series
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