Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 1022

Serial Communications Instructions
Receive Area Not Held
Communications sequence
Receive buffer
Receive area (starting at
R+1)
Receive Area Held
Communications sequence
Receive buffer
Receive area (starting at
R+1)
The following programming example shows the instructions used to con-
stantly or periodically execute PMCR(260) to read data through a single
receive operation.
Always ON
Flag
Cleared
Cleared and
previous
data stored
Protocol
Communica-
Macro
tions Port En-
Execution
abled Flag
Flag
Set
Data that was set will be
transfer if new data is not
successfully received.
m words
Recv
Error
Cleared data
(all zeros)
stored.
Recv
Error
Set data stored if no new
data has been received
Section 3-24
Receive
buffer
983