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4 Using Protocol Macros
4-8
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
A) Structure of Variable Area Read (MRC/SRC: 0101)* send message
B) Structure of Variable Area Read (MRC/SRC: 0101)* receive message
* MRC/SRC (0101) represents the Variable Area Read service available via CompoWay/F communication.
z
Detailed Example of CompoWay/F Message
CompoWay/F communication protocol for digital temperature controller E5
@
N
Send message
Receive message
For message details, refer to the E5CN/E5AN/E5EN/E5GN Digital Temperature Controllers Commu-
nications Manual (Basic Type) (Cat. No. H158).
MRC
SRC
Variable type
Read start address
Bit number
Number of elements
0
1
0
1
0
0
2
2
2 4 2 4
MRC
SRC
Response code
Read data (for number of elements)
0
1
0
1
2
2
4
Number of elements
×
8 or 4
BCC
1
Text
Node No.
Subaddress
SID
Command text
STX
0
0
0
ETX
1
2
2
1
1
BCC calculation range
STX
Text
Node No.
Subaddress
End code
Command text
BCC
0
0
ETX
1
2
2
2
1
1
BCC calculation range