Omron CQM1H-SCB41 operation manual 124

Board Replacement					Section 9-2
Serial com-	Indicator	Status	I/O memory	Cause	Remedy
munications	status	information,
mode		etc.
Host Link,	The COMMj	A transmis-	---	There is a hard-	Conduct a loopback test
slave-initiated	indicators are	sion error		ware error in the	in serial communications
communica-	flashing, but	has not been		reception circuit.	mode to check the trans-
tions	there is no re-	detected at			mission lines. If an error
	sponse from	the host.			occurs during the test, re-
	the host.				place the Serial Commu-
					nications Board.
			---	Cables are incor-	Check the wiring and cor-
				rectly wired.	rect.
			---	There is a hard-	Conduct a loopback test
				ware error in the	in serial communications
				reception circuit.	mode to check the trans-
				Adapters such as	mission lines. If an error
					occurs during the test, re-
				the NT-AL001-E
					place the Serial Commu-
				are incorrectly
					nications Board.
				wired or set.
			---	---	Check the program at the
					host. When unsolicited
					communications are used
					with Host Link mode,
					there must be a response
					returned from the host for
					every command sent from
					the Serial Communica-
					tions Board.
			Communications	The communica-	Reset the parameters in
			parameters and	tions conditions	the PC Setup and at the
			baud rate settings	and baud rate do	host correctly.
			in the PC Setup do	not match the set-
			not correspond with	tings at the host.
			the settings at the
			host.

124