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4-3SectionApplication Procedure
43
1:N Connections Using RS-422A/485 Ports
5-V (+)
power (–)
D-sub, 9-pin
connector (male)
NT-AL001-E Link Adapter
Shield
RS-232C
Interface
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: OFF
Pin
Signal
Serial Communications
Board
Computer
Terminal block
Hood
Terminating resistance OFF
4-wire
Serial Communications
Board
Terminating resistance ON
(last node)
4-wire
5-V (+)
power (–)
D-sub, 9-pin
connector (male)
NT-AL001-E Link Adapter
Shield
RS-232C
Interface
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: OFF
Serial Communications
Board
Computer
RS-232C
Terminal block
Terminating resistance OFF
4-wire
Serial Communications
Board
Terminating resistance ON
(last node)
4-wire
3G2A9-AL001 Link Adapter
Signal
Pin
RS-422A/
485 Inter-
face
D-sub, 9-pin
connector (male)
Shield
Shield
Signal Signal Pin
Pin
Signal Signal Pin Pin Signal
RS-422A/
485 Inter-
face
Pin Signal
RS-422A/
485 Inter-
face
Hood
PinSignal Signal PinSignal
Pin Signal
RS-422A/
485 Inter-
face
Hood
RS-422A
Pin
Signal
RS-422A/
485 Inter-
face
Hood
FG
SD
RD
RTS
CTS
DSR
DTR
SG
NC
SD
RD
RTS
CTS
5V
DSR
DTR
SG
FG
SD
RD
RTS
CTS
DSR
DTR
SG
NC
SD
RD
RTS
CTS
5V
DSR
DTR
SG