Omron NT21 - SETUP MANUAL 10-2001 Setup Manual page 108

Connecting to the Host's RS-232C Port
Connecting the NT21-side Link Adapters to the Host-side Link Adapter (RS-485)
NT-AL001 NS-AL002
8
7
6
5
4
3
2
1
Connecting between the NT21-side Link Adapters (RS-422A)
NT-AL001
RS-422A
terminal
8
block
7
6
5
4
3
2
1
DIP Switch Settings
NT-AL001:
NS-AL002
NS-AL002:
NT-AL001 or NS-AL002 Link
Adapter (NT21)
Pin number
NT-AL001 NS-AL002
1 1
RS-422A
terminal
2 ---
block
3 3
4 7
5 2
6 6
7 ---
8 ---
DIP Switch Settings
NT-AL001: Pins 1, 3, 4, and 6 ON
Pins 2 and 5 OFF
NS-AL002: Pins 1 to 3 ON
Pin 4 OFF
To avoid an FG ground loop, do not connect the functional ground of the Link
Adapter at the NT21 to the RS-485 cable shielding.
Link Adapter
Pin number Abbreviation
NT-AL001 NS-AL002
F. Ground
1 1
SG
2 ---
SDB
3 3
4 7 SDA
5 2 RDB
6 6 RDA
7 ---
CSB
8 --- CSA
Pins 1 and 6 ON
Pins 2 to 5 OFF
(Turn ON pin 2 to enable the
terminator in the last Unit.)
Pin 1 ON
Pins 2 to 4 OFF
(Turn ON pin 4 to enable the
terminator in the last Unit.)
Link Adapters
(NT-AL001 or
RS-485
NT21
NS-AL002)
(Total length
500 m max.)
Abbreviation Shield
F. Ground
SG
SDB
SDA
RDB
RDA
CSB
CSA
To next PT
Link Adapters
NT21
(NT-AL001 or
NT-AL001
NS-AL002)
RS-422A
(Total length
500 m max.)
Link Adapter
Abbreviation
NS-AL002
F. Ground
SG
SDB
SDA
RDB
RDA
CSB
CSA
DIP Switch Settings
NT-AL001:
Shield
NS-AL002:
Section
Host
NT-AL001
NT-AL001 Link Adapter
(Host)
Abbreviation Pin number
F. Ground 1
SG 2
RS-422A
SDB 3 terminal
block
4
SDA
RDB 5
6
RDA
7
CSB
8
CSA
DIP Switch Settings
Pins 1 to 4 and 6 ON
Pin 5 OFF
Host
NT-AL001
Pin number
NT-AL001
1 1
RS-422A
terminal
--- 2
7
block
3 3
5
7 4
2 5
3
6 6
--- 7
1
--- 8
Pins 1 and 6 ON
Pins 2 to 5 OFF
(Turn ON pin 2 to enable the
NS-AL002
terminator in the last Unit.)
Pin 1 ON
Pins 2 to 4 OFF
(Turn ON pin 4 to enable the
terminator in the last Unit.)
5-2
8
6
4
2
97