Omron CQM1H-SCB41 operation manual 2 RS-232C Port, CPU Unit Indicators, Connector Pin Layout

	Wiring					Section 2-1
CPU Unit Indicators		A Serial Communications Board is mounted as an Inner Board in the CPU Unit
		and thus affects the CPU Unit ERR/ALM indicator.
		Indicator	Color	Status		Meaning
		ERR/ALM	Red	Lit	Fatal error	If a fatal error occurs, the CPU
						Unit will stop operation in
						either RUN or MONITOR
						mode.
				Flashing	Non-fatal	If a non-fatal error occurs, the
					error	CPU Unit will continue
						operation in either RUN or
						MONITOR mode.
				Not lit	Normal	The CPU Unit is operating
					operation	normally. This indicator will
						also not be lit when a
						watchdog timer error occurs.

If an error in the Inner Board is the cause of the error indicated on the ERR/ALM indicator, the Inner Board Error Flag (SR 25415) will turn ON and information on the error will be stored in AR 0400 to AR 0407. Refer to Section 9 Troubleshoot- ing and Maintenance for details.

2-1-2 RS-232C Port

Protocol	Host Link	No-protocol	Protocol macros	1:1 Data Links	1:N NT Links	1:1 NT Links
Communica-	Half-duplex
tions method
Synchroniza-	Start-stop synchronization (asynchronous)
tion
Baud rate	1,200/2,400/4,800/9,600/ 19,200 bps			19,200 bps	38,400 bps	19,200 bps
Connections	1:1			1:1	1:1	1:1
	(1:N possible using Converting Link Adapters)				(1:N possible us-
					ing Link Adapters)
Transmission	15 m max. (See note)
distance
Interface	Complies with EIA RS-232C

Note The maximum cable length for RS-232C is 15 m. The RS-232C standard, how- ever, does not cover baud rates above 19.2 Kbps. Refer to the manual for the device being connected to confirm support.

Connector Pin Layout

Pin No.	Abbreviation	Signal name	I/O
1 (See note 1)	FG	Shield	---
2	SD	Send data	Output
3	RD	Receive data	Input
4	RTS (RS)	Request to send	Output
5	CTS (CS)	Clear to send	Input
6 (See note 2)	5V	Power supply	---
7	DSR (DR)	Data set ready	Input
8	DTR (ER)	Data terminal ready	Output
		(See note 4)
9	SG	Signal ground	---
Shell (See note 1)	FG	Shield	---

Note 1. Pin No. 1 and the shell are connected to the ground terminal (GR) of the Power Supply Unit inside the Serial Communications Board. Therefore, the cable shield can be grounded by grounding GR of the Power Supply Unit.

2.Pin 6 (5 V) is required when the NT-AL001-E Link Adapter is connected. For details on connection methods, refer to 2-3 Wiring.

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