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5-4SectionUsing Protocol Macros
75
1:N Connections Using RS-422A/485 Ports
Signal Pin
Serial Communications Board
RS-422A/
485 inter-
face
Device supporting RS-422A/485
communications (2-wire)
Hood
D-sub, 9-pin
connector (male)
Signal
RS-422A/
485 inter-
face
D-sub, 9-pin
connector (male)
RS-422A/
485 Inter-
face
Signal
Pin
Pin
Pin
Signal
Signal
Serial Communications Board
Hood
D-sub, 9-pin
connector (male)
Device supporting
RS-422A/485
communications
(2-wire)
Signal
RS-422A/
485 inter-
face
Shield
Shield
Device supporting
RS-422A/485
communications
(4-wire)
Signal
RS-422A/
485 inter-
face
Device supporting
RS-422A/485
communications
(4-wire)
RS-422A/
485 inter-
face
Signal
Signal
Pin
RS-422A/
485 inter-
face
Terminating resistance ON
4-wire
Terminating resistance ON
4-wire
3G2A9-AL001
RS-422A/
485 Inter-
face
Pin
Signal
Serial Communications Board
Hood
D-sub, 9-pin con-
nector (male)
(+) 5-V
(–) power
D-sub, 9-pin con-
nector (male)
RS-232C
Interface
Signal
Signal Pin
DIP Switch
Pin 2: OFF,
otherwise
same as below.
Pin Signal
Shield
Shield
D-sub, 9-pin
connector
(male)
DIP Switch
Pin 1: ON
Pin 2: ON (terminating
resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: ON
Shield
Terminal block
(+) 5-V
(–) power
RS-232C
Interface
Signal
Shield
Signal PinPin Signal
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
FG
SD
RD
RTS
CTS
DSR
DTR
SG
NT-AL001-E Link Adapter
NT-AL001-E Link Adapter
Terminating resistance ON
4-wire