Omron CJ1W-SCU32 Operation Manual page 264

7 Using Modbus-RTU Slave Mode
7-3-2 Command and Response Details
Read Coils
Function
Reads multiple bits from the CIO, Work, Holding, or Auxiliary Area of the memory used for CJ-series
Unit.
Command
Function Code
Starting Address
Quantity of Coils
* The address depends on the area that is allocated.
Response
Function Code
Byte Count
Coil Status
* N=Quantity of Registers
Reading 19 Bits from CIO 0001.04 to CIO 0002.06
Request
Function Code
Starting Address (H)
Starting Address (L)
Quantity of Coils (H)
Quantity of Coils (L)
Note Unused bits are filled with zeros.
15 14 13
CIO 0 15 14 13
CIO 1 31 30 29
1 0 1
CIO 2 47 46 45
CIO 3 63 62 61
Note The subscript numbers in the shaded boxes indicate the TRUE/FALSE (1/0) status of the bits
that are read.
7-14
Length
1 byte
2 bytes
2 bytes
Length
1 byte
1 byte
n byte
Data
01 hex Function Code
00 hex Byte Count
14 hex Coil Status 27 to 20
00 hex Coil Status 35 to 28
13 hex Coil Status 38 to 36
12 11 10 9 8
12 11 10 9 8
28 27 26 25 24
1 1 1 0
44 43 42 41 40
60 59 58 57 56
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Data
01 hex
0000 to FFFF hex (*)
0001 to 03E8 hex (1 to 1000)
Data
01 hex
N (*)
n = N or N+1
Response
Data
01 hex
03 hex
CD hex
6B hex
05 hex
7 6 5 4
7 6 5 4
23 22 21 20
0 1 1 0 1
39 38 37 36
1 0 1
55 54 53 52
3 2 1 0
3 2 1 0
19 18 17 16
35 34 33 32
0 1 1 0
51 50 49 48