1:N Connections Via Rs-232C Port - Omron CJ2 CPU UNIT User Manual

Appendices

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.
RS-232C
NT-AL001
terminating
resistance ON,
5-V power
required
Personal Computer
Signal
name
RS-232C
FG
SD
RD
RS-232C
RS
Interface
CS
DR
ER
SG
(+)
5-V
power (–)
*2
*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.
A-118
RS-422A/485
NT-AL001
RS-232C RS-232C RS-232C
RS-232C ports
NT-AL001 Link Adapter
Shield
Pin
Signal Signal Pin
No. name name
No.
RS-422A
1 NC 1
GRD
2 SD SG 2
3 RD SDB 3
4 RS SDA 4
5 CS RDB 5
6 5V RDA 6
7 DR CSB 7
8 ER CSA 8
9 SG
RS-232 RS-422
Terminal block
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
Terminating resistance ON
NT-AL001 Link Adapter
Pin Signal Signal Pin
RS-232C
No. name name No.
*1
1 NC 1
GRD
2 SG SD 2
3 SDB RD 3
4 SDA RS 4
5 RDB CS 5
6 RDA 5V 6
7 CSB DR 7
8 CSA ER 8
SG 9
RS-422 RS-232
DIP Switch Settings
Pin 1: ON
Pin 2: OFF
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: ON
NT-AL001 Link Adapter
Signal
Pin Signal Pin RS-232C
name
name
No. No. *1
1
1 GRD NC
2
2 SG SD
3
3 SDB RD
4
4 SDA RS
5 5
RDB CS
6 6
RDA 5V
7 7
CSB DR
*2
8 8
CSA ER
SG 9
RS-422 RS-232
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: ON
CJ2 CPU Unit Hardware User's Manual
CPU Unit
Pin
Signal
No. name
1 FG
2 SD
3 RD
RS-232C
4 RS
Interface
5 CS
6 5V
*2
7 DR
8 ER
9 SG
D-sub, 9-pin connector
(male)
Serial Communications Board/Unit
Signal
Pin
name
No.
1 FG
2 SD
3 RD
RS-232C
4 RS
Interface
5 CS
6 5V
7 DR
8 ER
9 SG
D-sub, 9-pin connector
(male)