Omron CQM1H-SCB41 operation manual Changes from Previous Products, RS-232C Ports

Application Procedure	Section 4-5
A response will not be received with some errors, regardless of the command.
These errors are listed in the following table.
Error	PC operation
Parity, overrun, or framing error during	The Communications Error Flag will be turned ON, an error code will
command reception. (Same even for	be registered, and receptions will be reset. (The error will be cleared
commands address to other Units.)	automatically if communications restart normally.)
	The Communications Error Flags are as follows:
	Peripheral port: AR 0812
	Built-in RS-232C port: AR 0804
	Serial Communications Board port 1: IR 20104,
	Serial Communications Board port 2: IR 20112
A command is received that does not have the	The command will be discarded.
@ character at the beginning of the first frame.
Incorrect node number (Not a local unit or over	The command will be discarded.
31)
The data in an intermediate or final frame for	An FCS error will occur.
multiframe writes is 2 bytes or longer.

4-5	Changes from Previous Products
		There are differences between Host Link Systems created using the CQM1H-
		series Serial Communications Boards in comparison to Host Link Systems
		created with Host Link Units and CPU Units in other PC product series. These
		differences are described in this section.
4-5-1	RS-232C Ports
		Take the following differences into consideration when changing from an exist-
		ing Host Link System to one using an RS-232C port on a CQM1H-series CPU
		Unit or Serial Communications Boards.
Previous		Model number	Changes required for CQM1H-series product
products
			Wiring		Other
C-series Host		3G2A5-LK201-E	The connector has been		The following changes are necessary for
Link Units		C500-LK203	changed from a 25-pin to a		systems that sync with ST1, ST2, and RT.
			9-pin connector.		Synchronized transfers will no longer be
		3G2A6-LK201-E
			The CQM1H-series		possible.
			products do not support the		Half-duplex transmissions will be possible
			ST1, ST2, and RT signals
					with the CQM1H-series product, but the host
			and wiring them is not
					computer’s communications program,
			required.
					hardware, or both will need to be altered.
					The following changes are necessary for
					systems that did not sync with ST1, ST2,
					and RT.
					It may be possible to use the host computer
					programs without alteration as long as the
					same communications settings (e.g., baud
					rate) are used. It may be necessary, however,
					to change programs to allow for different text
					lengths in frames or different CQM1H
					command specifications. (See note.)
		C200H-LK201	The connector has been		It may be possible to use the host computer
			changed from a 25-pin to a	programs without alteration as long as the
			9-pin connector.		same communications settings (e.g., baud
					rate) are used. It may be necessary, however,
					to change programs to allow for different text
					lengths in frames or different CQM1H
					command specifications. (See note.)

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