Omron FQM1-CM001 Serial Communications, Section, Procedure, Message Frame Formats, Item, Cr+Lf

Serial Communications Section 6-1

Procedure

Make the System Setup settings from the CX-Programmer (e.g., set the serial communications mode to Non-proceduraland set the other communications conditions.)

Power OFF

Refer to the CX-Programmer Operation Manual.

Connect the Coordinator Module and the general-purpose external device using RS-232C

Power ON

FQM1 → General-purpose external device

Execute TXD.

General-purpose external device → FQM1

Execute RXD.

Message Frame Formats

Data can be placed between a start code and end code for transmission by TXD(236) and frames with that same format can be received by RXD(235). When transmitting with TXD(236), just the data from I/O memory is transmitted, and when receiving with RXD(235), just the data itself is stored in specified area in I/O memory.

Up to 256 bytes (not including the start and end codes) can be transferred each time TXD(236) or RXD(235) are used. The start and end codes are specified in the System Setup.

Message Frame Formats for No-protocol Mode Transmission and Reception

Item				End code setting
		No		Yes			CR+LF
Start code	No	Data		Data	ED		Data	CR+LF
setting
	256 bytes max.		256 bytes max.			256 bytes max.
	Yes	Data	ST	Data	ED	ST	Data	CR+LF
	ST
		256 bytes max.		256 bytes max.			256 bytes max.

•When more than one start code is used, the first start code will be valid.

•When more than one end code is used, the first end code will be valid.

•If the data being transferred contains the end code, the data transfer will be stopped midway. In this case, change the end code to CR+LF.

Note The transmission of data after the execution of TXD(236) can be delayed by a

specified transmission delay time, as shown in the following diagram.

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