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Using an RS-232C/RS-422A Adapter Appendix C
DIP Switch Settings
The Adapter has 6 digits DIP switch for setting the RS-422A/485 communications conditions.
Before connecting the cable to the Adapter, make the DIP switch settings.
When using the host link or 1:1 NT Link, set the RS-422A send mode to continual sending (set both SW1-5 and
6 OFF).
When using the 1:N NT Link (standard or high-speed), set the RS-422A send mode to complies with CS con-
trol 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 a C200HX/HG/HE (-ZE), CQM1H, CS/CJ-series OMRON PLC
as an RS-422A device, set DIP switches SW1-5 and SW1-6 as indicated below.
1 2 3 4 5 6
OFF
ON
SW1-3 SW1-4
ON
om on
R
NT-AL001-E
(Factory settings)
[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
2-wire type (RS-485)
SW1-3 SW1-4
OFF
ON
4-wire type (RS-422A)
SW1-5 SW1-6
SW1-5 SW1-6
SW1-5 SW1-6
[SW1-5, 6] Selection of the RS-422A send mode
Continual sending
OFF
ON
OFF
ON
OFF
ON
Complies with CS control of RS-232C
(Data sent at CS high)
Complies with CS control of RS-232C
(Data sent at CS low)
56
SW1-5
OFF
SW1-6
ON
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