Omron CQM1H-SCB41 operation manual Modifying Standard System Protocols, Send&Receive

Using Protocol Macros Section 5-1

Modifying Standard System Protocols

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

CPU Unit	Serial Communications Board
		Modified standard	Command execution (SEND, RECEIVE,
			SEND&RECEIVE)
	Sequence No.	system protocol

	specification	Messages
Sequence		Step 0
number		Step 1
		RS-232C or RS-422A/485
		Step 2
		General-purpose external device
I/O memory		Shared memory
	I/O refreshing

Creating a New Protocol 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
	Serial Communications Board
CPU Unit	Newly created protocol	Command execution (SEND, RECEIVE,
		SEND&RECEIVE)
	Step 0	Messages
Sequence
	Sequence No.
number	specification

I/O memory

Step 1

RS-232C or RS-422A/485

Step 2

General-purpose external device

Shared memory

I/O refreshing

64