11 Programming Devices and Communications
11-20
CJ2 CPU Unit Software User’s Manual
The CX-Protocol is used to create data transmission procedures (protocols) for general-purpose exter-
nal devices according to the communications specifications (half-duplex or full-duplex, asynchronous)
of the general-purpose external devices. The protocols that have been created are then recorded in a
Serial Communications Unit, enabling data to be sent to and received from the external devices by sim-
ply executing the PMCR(260) instruction in the CPU Unit. Protocols for data communications with
OMRON devices, such as Temperature Controller, Intelligent Signal Processors, Bar Code Readers,
and Modems, are supported as standard protocols. (*1) The user can also change these protocol as
required by the application.
*1 The standard protocols are provided with the CX-Protocol and Serial Communications Unit.
Note CompoWay/F (Host Function)
The CJ-series CPU Unit can operate as a host to send CompoWay/F commands to OMRON components
connected in the system. CompoWay/F commands are executed by using the CompoWay/F send/receive
sequences in the standard protocols of the protocol macro function.
Protocol Macros (Serial Communications Units Only)
Messages
General-purpose
external device
Messages
Applicable port
USB port
RS-232C port
Serial
Communi-
cations
Unit
CPU Unit
Host computer
CX-Protocol or PSS Support
software for protocol macro
function
Protocol
NoNo
Yes
CompoWay/F command
Protocol macro
CompoWay/F
OMRON
components
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