1 Modbus RTU protocol
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9
1
Modbus RTU protocol
1.1
Read Coil Status(Func 01–01H)
Reads output(OX reference, Coil) ON/OFF status in the 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 output status(ON: 1, OFF: 0) of 10 within coil 000001(0000 H) to 000010(0009 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
01 H
00 H
00 H
00 H
0A H
## H
## H
If the values range from coil 000008(0007 H) to 000001(0000 H) on the slave are “ON-ON-OFF-
OFF-ON-ON-OFF-ON”, and the values from 000010(0009 H) to 000009(0008 H)are respectively
“OFF-ON”.
Response (Slave)
Slave Address Function
Byte Count
Data
(000008 to 000001)
Data
(000010 to 000009)
Error Check(CRC16)
Lo(Lower)
Hi(Upper)
11 H
01 H
02 H
CD H
01 H
## H
## H
CRC16
CRC16
Содержание BFC Series
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