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32
Connecting Link Adapters and RS-422A Converters
Section 2-3
DIP Switch Settings
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.
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.
Note
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 sup5 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.
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: Built-in terminator setting
- OFF Terminator not set
- ON
Terminator set
SW1-3 and SW1-4: 2-wire/4-wire
2-wire (RS-485)
SW1-3 SW1-4
OFF
ON
4-wire (RS-422A)
SW1-5 SW1-6
SW1-5 SW1-6
SW1-5 SW1-6
SW1-5 and SW1-6: RS-422A send mode
No RS/CS control
RS-232C CS control (high)
(Data sent at CS high)
RS-232C CS control (low)
(Data sent at CS low)
OFF
ON
OFF
ON
OFF
ON
Summary of Contents for NT20
Page 1: ...Programmable Terminal Cat No V091 E1 01 NT20 USER S MANUAL ...
Page 2: ...NT series Programmable Terminal User s Manual Produced March 2007 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 15: ...xvi ...
Page 21: ...xxii EC Directives 6 ...
Page 37: ...16 Before Operating Section 1 6 ...
Page 153: ...132 Transferring the Resource Data Section 3 11 ...
Page 185: ...164 Numeral Setting Section 4 8 ...
Page 267: ...246 Key to Programs Section 6 8 ...
Page 281: ...260 Specifications Appendix A ...
Page 285: ...264 Transporting and Storing PTs Appendix C ...
Page 303: ...282 Function Restrictions Depending on the Support Tool Appendix I ...
Page 307: ...286 Index ...
Page 309: ...288 Revision History ...