6
CJ-series Features Section 1-2
Port-specific Protocol Macros
Create Protocol Macros
for All Ports
Protocol macros can be used to create versatile communications functions for
any of the PLC’s communications ports. The communications functions can
have host link, NT Link, or protocol macro configurations and can be directed
to RS-232C and RS-422/485 ports on any of the Units.
All together, a CPU Unit can support a maximum of 32 ports. In addition, up to
16 ASCII Units can be connected. The ASCII Units can be used to create pro-
tocol functions with BASIC programs.
Standard Serial Communications with External Devices
Messages can be transferred to and from standard serial devices with the pro-
tocol macro function (according to preset parameter settings). The protocol
macro function supports processing options such as retries, timeout monitor-
ing, and error checks.
Symbols that read and write data to the CPU Unit can be included in the com-
munications frames, so data can be exchanged with the CPU Unit very easily.
OMRON components (such as Temperature Controllers, ID System Devices,
Bar Code Readers, and Modems) can be connected to a Serial Communica-
tions Unit with the standard system protocol. It is also possible to change the
settings if necessary.
Note The Serial Communications Unit must be purchased separately to take
advantage of this function.
Host Computer Programming Device
CPU Unit
Serial Communications
Unit
Up to 32 ports are possible
PT
External device
with serial port
Transmit or receive data with just one instruction.
External device
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