
IB-23C650M
MODBUS PROTOCOL
Preset Single Register
Master Message Format Bytes
0 1 2 & 3 4 & 5 6 & 7
Device Address Function Code Register Number Register Data CRC
Slave Response (simple echo) Bytes
0 1 2 & 3 4 & 5 6 & 7
Device Address Function Code Register Number Register Data CRC
Loopback Diagnostic Test
Master Message Format Bytes
0 1 2 & 3 4 & 5 6 & 7
Device Address Function Code Diagnostic Code
(0000 only)
Data (ignored) CRC
Slave Response (simple echo) Bytes
0 1 2 & 3 4 & 5 6 & 7
Device Address Function Code Diagnostic Code
(0000 only)
Data (ignored) CRC
Force Multiple Coils
Master Message Format Bytes
0 1 2 & 3 4 & 5 6 7
...
x
x+1 &
x+2
Device
Address
Function
Code
Starting
Coil
Number
Number
of Coils
Number
of Data
Bytes
Data Byte
1
... Data
Byte n
CRC
Slave Response Bytes
0 1 2 & 3 4 & 5 6 & 7
Device Address Function Code Starting Coil Number Number of Coils CRC
37
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