Omron CQM1H-SCB41 User Manual

5-1

Section

Using Protocol Macros

If there is no standard system protocol for the required OMRON product or you
wish to modify part of the protocol, you can use the CX-Protocol to modify a stan-
dard system protocol, transfer this as a separate communications sequence to
the Serial Communications Board, and execute the PMCR(––) instruction.

Modifying and transferring
standard system protocols

Modified standard
system protocol

Command execution (SEND, RECEIVE,
SEND&RECEIVE)

RS-232C or RS-422A/485

General-purpose external device

CPU Unit

Sequence
number

I/O memory

Sequence No.
specification

I/O refreshing

Shared memory

Step 0

Messages

Serial Communications Board

Step 1

Step 2

When connecting a general-purpose external device that has an RS-232C or
RS-422A/485 port, use the CX-Protocol to create a new protocol containing the
communications specifications for the general-purpose external device, trans-
fer these specifications to the Serial Communications Board, and execute the
PMCR(––) instruction.

Creating and transferring a new protocol

Newly created protocol