Omron NT631C manual 262

Using an RS-232C/RS-422A Adapter Appendix C

ON 1 2 3 4 5 6

(Factory settings)

om on NT-AL001-E

[SW1-1] Not used (always ON)

[SW1-2] Setting for built-in terminal resistance

- OFF	Terminator not set
- ON	Terminator set
[SW1-3, 4] Selection of 2-wire type/4-wire type
	SW1-3 SW1-4
	OFF	2-wire type (RS-485)
	ON
	SW1-3 SW1-4
	OFF	4-wire type (RS-422A)
	ON

[SW1-5, 6] Selection of the RS-422A send mode SW1-5 SW1-6

OFF

ON

SW1-5 SW1-6

OFF ON

SW1-5 SW1-6

OFF

ON

Continual sending

Complies with CS control of RS-232C (Data sent at CS H)

Complies with CS control of RS-232C (Data sent at CS L)

When using the host link or NT link (1:1), set the RS-422A send mode to continual sending (set both SW1-5 and 6 OFF).

When using the NT link (1:N), set the RS-422A send mode to complies with CS control of RS-232C (i.e., one of SW1-5 and SW1-6 must be ON).

Note (1) Do not set both SW1-5 and SW1-6 ON at the same time. This may damage internal circuits.

(2)The power supply to the device supplying +5 V must be turned OFF before starting wiring work.

(3)Before connecting the RS-232C cable and turning on the power to an RS-232C device such as a PT (i.e., turning on the power to the Adapter), check that the cable is wired correctly and that the DIP switch settings are correct. If the power is turned on while there is a wiring fault, the internal circuits of the Adapter or the RS-232C device may be damaged.

(4)When the Adapter is connected to an OMRON C200HX/HG/HE(-Z)E, CQM1H, or CS/CJ-series PLC as an RS-422A device, set DIP switches SW1-5 and SW1-6 as indicated below.

SW1-5 SW1-6

OFF ON

5 6

262