Appendices
A-118
CJ2 CPU Unit Hardware User’s Manual
z 1:N Connections via RS-232C Port
A connection example for converting between RS-232C and RS-422A/485 to use 1:N connections is
shown below.
*1 We recommend using the following NT-AL001 RS-232C/RS-422A Link Adapter Connecting Cables to connect
to NT-AL001 Link Adapters.
XW2Z-070T-1: 0.7 m
XW2Z-200T-1: 2 m
• Wiring the Recommended Cable (XW2Z-070/200T-1)
The recommended cables should be wired as shown below. For an RS-232C cable, each signal wire
should be twisted with the SG (signal ground) wire and placed in a shielded cable to prevent the effects of
noise in noise-prone environments. The 5-V wires can also be twisted with the SG wire to increase noise
immunity. Although this wiring is different from that shown in the example above, it can be used to
increase noise immunity if required.
NT-AL001
RS-422A/485
RS-232C
RS-232C RS-232C RS-232C
NT-AL001
terminating
resistance ON,
5-V power
required
Terminating resistance ON
RS-232C ports
RS-232C
RS-232C
Shield
CPU Unit
*2
Personal Computer
Signal
name
Signal
name
Signal
name
Signal
name
Signal
name
Signal
name
Signal
name
Signal
name
Signal
name
RS-232C
Interface
NT-AL001 Link Adapter
D-sub, 9-pin
connector (male)
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: OFF
DIP Switch Settings
Pin 1: ON
Pin 2: OFF
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: ON
D-sub, 9-pin connector
(male)
RS-232C
Interface
RS-232C
Interface
*1
*2
D-sub, 9-pin connector
(male)
Serial Communications Board/Unit
NT-AL001 Link Adapter
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: ON
NT-AL001 Link Adapter
Pin
No.
Pin
No.
Pin
No.
Pin
No.
Pin
No.
Pin
No.
Pin
No.
Pin
No.
RS-232C
Terminal block
FG
SD
RD
RS
CS
DR
ER
SG
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
RS-422A
*1
*2
NC
SD
RD
RS
CS
5V
DR
ER
SG
NC
SD
RD
RS
CS
5V
DR
ER
SG
GRD
SG
SDB
SDA
RDB
RDA
CSB
CSA
GRD
SG
SDB
SDA
RDB
RDA
CSB
CSA
FG
SD
RD
RS
CS
5V
DR
ER
SG
RS-232 RS-422 RS-422 RS-232
1
2
3
4
5
6
7
8
GRD
SG
SDB
SDA
RDB
RDA
CSB
CSA
RS-422
1
2
3
4
5
6
7
8
9
NC
SD
RD
RS
CS
5V
DR
ER
SG
RS-232
1
2
3
4
5
6
7
8
9
FG
SD
RD
RS
CS
5V
DR
ER
SG
5-V
power
(+)
(–)
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