Omron CJ - INSTRUCTIONS

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3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Serial Communications Instructions
3
PMCR
Precautions
• The data in the send area specified with S is actually sent using the symbol read option, R( ), in a
send message.
• Data is actually received to the receive area specified by R using the symbol write option, W( ), in a
receive message.
• Refer to the CX-Protocol Operation Manual (W344) for procedures for designating symbols R( ) and
W( ).
• PMCR(260) can be executed for a serial communications port on a Serial Communications Board
(CS Series only) or Serial Communications Unit. Up to 16 Serial Communications Units can be
mounted to the CPU Rack and Expansion I/O Racks. The Unit address of the communications
partner must be set in bits 0 to 7 of C1 to specify which Unit/Board is to be used and the serial port
number must be set in bits 8 to 11. Unit addresses are specified as shown in the following table.
Unit/Board Unit address
Serial Communications Board
(CS Series only)
E1 hex
Serial Communications Unit Unit number + 10 hex
Error
Recv
Error
Recv
Receive Area Not Held
Receive Area Held
Communications sequence
Receive buffer Cleared
Receive area (starting at
R+1)
Cleared data
(all zeros)
stored.
Communications sequence
Receive buffer
Cleared and
previous
data stored
Receive area (starting at
R+1)
Set data stored if no new
data has been received
Serial Communications Units
Serial Communications Board
(CS Series only)
Serial Port 1, 2
E1 hex (CS Series only)
Unit No. + 10 hex
Unit address