Omron NT20S-ST121B-EV3 User Manual page 53

Connecting Link Adapters and RS-422A Converters
DIP Switch Settings
Note
32
The NT-AL001 Link Adapter has a 6-pin DIP switch that sets the RS-422A/
RS-485 communications conditions. Set the DIP switch before connecting the
communications cable.
(Factory settings)
ON
1 2 3 4 5 6
When using Host Link or 1:1 NT Link communications, set the RS-422A send
mode to "no RS/CS control" by turn OFF both SW1-5 and SW1-6.
When using 1:N NT Link communications (standard or high-speed), set the
communications mode to "RS/CS control" by turning ON either pin SW1-5 or
SW1-6.
1. Do not turn ON both SW1-5 and SW1-6 at the same time. This may dam-
age 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 Link Adapter),
check that the cable is wired correctly and that the DIP switch settings are
correct. If the power is turned ON and there is a wiring fault, the internal
circuits of the Link Adapter or the RS-232C device may be damaged.
R NT-AL001-E
om on
SW1-1: Not used (always ON)
SW1-2: Built-in terminator setting
- OFF Terminator not set
- ON Terminator set
SW1-3 and SW1-4: 2-wire/4-wire
SW1-3 SW1-4
OFF
2-wire (RS-485)
ON
SW1-3 SW1-4
OFF
4-wire (RS-422A)
ON
SW1-5 and SW1-6: RS-422A send mode
SW1-5 SW1-6
OFF
No RS/CS control
ON
SW1-5 SW1-6
OFF RS-232C CS control (high)
(Data sent at CS high)
ON
SW1-5 SW1-6
OFF
RS-232C CS control (low)
(Data sent at CS low)
ON
Section 2-3