Omron CVM1D Operation Manual page 404

Network Instructions
Programming Example:
Synchronizing Data
The following program shows how to synchronize data transmission during
asynchronous operation using IOSP(187) and IORS(188).
In the program in PC A (the sending PC), the data is set in memory while the
Enabled Flag is ON, i.e., when SEND(192) is not being executed, and a code is
added in the last word of data to verify that the data has been transmitted suc-
cessfully.
In the program in PC B (the receiving PC), the code in the last word of the trans-
mitted data is used to prevent more data from being transferred until the trans-
mitted data is copied to another section of Data Memory for storage. The code is
erased from the original block of data after it is copied.
SEND
S C P
L P S
K U
PC A
jSEND D00000
D01000
Data
$AAAA
Terminator set in send data
at PC A.
S C P
L P S
K U
PC B
D02000
(020)
CMP #AAAA D01255
(187)
IOSP
A500
13
(040)
XFER #0255 D01000
(030)
M0V #0000 D01255
(188)
IORS
(005)
JME 00
Section 5-34
A500
06
(004)
JMP 000
D02000
399