Omron CQM1H-SCB41 operation manual 2 RS-422A/485 Ports

Application ProcedureSection 4-5

4-5-2 RS-422A/485 Ports

Take the following differences into consideration when changing from an exist- ing Host Link System to one using an RS-422A/485 port on a CQM1H-series Serial Communications Board.

Previous	Model number	Changes required for CQM1H-series product
products
		Wiring	Other
C-series Host	3G2A5-LK201-E	Wiring pins have been	It may be possible to use the host computer
Link Units	C200H-LK202	changed as shown below.	programs without alteration as long as the
		SDA: Pin 9 to pin 1	same communications settings (e.g., baud
	3G2A6-LK202-E
			rate) are used. It may be necessary,
		SDB: Pin 5 to pin 2
			however, to change programs to allow for
		RDA: Pin 6 to pin 6
			different text lengths in frames or different
		RDB: Pin 1 to pin 8
			CQM1H command specifications. (See
		SG: Pin 3 to
			note.)
		Not connected
		FG: Pin 7 to pin
		Connector hood
C200HX/HG/HE	C200HW-COMjj-E	No changes have been	It may be possible to use the host computer
Communications		made in wiring.	programs without alteration as long as the
Board			same communications settings (e.g., baud
			rate) are used. It may be necessary,
			however, to change programs to allow for
			different CQM1H command specifications.
CS1-series CPU	CS1G/H-CPUjj	No changes have been	It may be possible to use the host computer
Unit		made in wiring.	programs without alteration as long as the
			same communications settings (e.g., baud
CS1-series Serial	CS1W-SCB21/41
			rate) are used. It may be necessary,
Communications	CS1W-SCU21
			however, to change programs to allow for
Board or Unit
			different CQM1H command specifications.
CVM1 or	CVM1/CV-CPUjj	No changes have been	It may be possible to use the host computer
CV-series CPU		made in wiring.	programs without alteration as long as the
Units			same communications settings (e.g., baud
			rate) are used. It may be necessary,
CVM1 or	CV500-LK201
			however, to change programs to allow for
CV-series Host
			different CQM1H command specifications.
Link Unit

Note The number of words that can be read and written per frame (i.e., the text lengths) when using C-mode Host Link commands is different for C-series Host Link Units and CQM1H-series Serial Communications Boards. A host computer program previously used for C-series Host Link Units may not function correctly if used for CQM1H-series PCs. Check the host computer program before using it and make any corrections required to handle different frame text lengths.

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