Omron CJ1W-SCU32 Operation Manual page 343

Command Frame Contents
Item
STX
Node number
Subaddress
SID
Command text
MRC and SRC
ETX
BCC
Response Frame Contents
Item
STX
Node number
Subaddress
End code (*)
Response text
MRES and SRES
ETX
BCC
* The end codes are described in the following table.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
A code, 02 Hex, indicating the beginning of a communications frame (text). This
code must always be set as the first byte.
The node number identifies the destination of the command frame. Specify "XX"
to broadcast a transmission. There will be no response made to a broadcast.
Set "00" for most components. Other values must be set for special components.
Set "0" for most components. Other values must be set for special components.
The body of the command. Refer to the command text for individual sequences.
The command code specifies the service to be used. Refer to the command
codes for individual sequences.
A code, 03 Hex, indicating the end of text.
The block check character (horizontal parity, 1 byte display). The character is an
exclusive OR of all data from just after the STX to the ETX.
A code, 02 Hex, indicating the beginning of a communications frame (text). This
code must always be set as the first byte.
The node number identifies the destination of the command frame. "XX" is speci-
fied to broadcast a transmission. There will be no response made to a broadcast.
"00" for most components. Other values must be set for special components.
The results of executing the command frame.
Note: The response code (MRES and SRES) indicates the results for the com-
mand code; the end code indicates the results for the command frame. These are
not the same.
The body of the response. Refer to the response text for individual sequences.
The response code specifies the results of processing the service requested by
the command code. Refer to the response codes for individual sequences.
A code, 03 Hex, indicating the end of text.
The block check character (horizontal parity, 1 byte display). The character is an
exclusive OR of all data from just after the STX to the ETX.
A Standard System Protocol
Meaning
Meaning
R-9