Omron CJ1W-SCU32 Operation Manual page 411

General-purpose Command 2 (Sequence No. 366 (Hex 016E))
This general-purpose command is used to send data with a specified data length, and receive back
ACK in addition to other receive data. The frame format of the receive data, however, has to contain
STX and ETX. STX and ETX are automatically attached to the send data.
Send Data Word Allocation (3rd Operand of PMCR(260))
First word of
send data
Offset
+0 Number of send data words
(4 digits Hex)
+1 Send data byte length
(4 digits Hex)
+2 to Send data (ASCII)
+128
Receive Data Storage Word Allocation (4th Operand of PMCR(260))
First word of
receive data
Offset
+0 Number of receive data words
(4 digits Hex)
+1 to Receive data (ASCII)
+249
Additional Information
Shown below is the receive data frame format. The reception data without ACK, STX, and ETX is
stored.
STX
ACK
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
+0 Number of send data words
Send data byte length
+1
+2
Send data
+3 Send data
+248 Send data
Send data
+249
Contents (data format)
+0
Number of receive data words
Receive data
+1
Receive data
+2
+248 Receive data
Receive data
+249
Contents (data format)
Receive data (498 bytes max.)
A Standard System Protocol
0003 to 00FA (3 to 250 decimal)
0001 to 01F0 (1 to 496 decimal)
The byte length of the send data excluding STX and ETX.
Set send data up to 496 bytes (max.) by ASCII.
0001 to 00FA (1 to 250 decimal)
Up to 498 bytes of ASCII receive data are stored.
Data
Data
ETX
R-77