4
the communications specifications of the external devices that are being com-
municated with (half duplex or start-stop sync). The protocols that are created
are loaded to the Communications Board to enable data transfer with the exter-
nal devices simply by executing the PMCR instruction from the PC. There are
also many system protocols provided with the Communications Boards and
Protocol Support Software to enable communications with OMRON Tempera-
ture Controllers, Panel Meters, Intelligent Signal Processors, Bar Code Read-
ers, Modems, etc. The system protocols can also be modified for other applica-
tions according to user needs.
CPU Unit
Communications Board
RS-232C, RS-422A, or RS-485
External device with RS-232C,
RS-422A, or RS-485 port or
OMRON component
Protocols
Protocol Support Software
Message
Message
+
Note
The following protocol macro functionality has been added to the V1 Commu-
nications Boards. The following are possible only for the C200HW-
COM
jj
-EV1 Communications Boards.
•
SUM2 (SUM of two’s complement) and CRC-16 can be used for error
checking.
•
The Repeat Counter N Present Value, a Sequence End Flag, and a Se-
quence Abort Flag are provided in the SR area.
•
The check code can be placed after the terminator in the message se-
quence. (Supported by SYSMAC-PST and CX-Protocol.)
•
The upper and lower bytes of the error check code can be swapped. (Sup-
ported by SYSMAC-PST and CX-Protocol.)
Functions
Section 1-1
