Omron NS7 Series Setup Manual page 211

Appendix 4 Using NS-AL002 RS-232C/RS-422A Converters
@ RS-422A Terminal Block
@ Crimp Terminals
Use M3 crimp terminals.
Forked type
6.2 mm max.
Applicable Crimp Terminal Examples
Forked type
Manufac-
turer
J.S.T. Mfg.
Co., Ltd.
Molex
Recommended Cable
Manufac-
turer
Tachii Elec-
tric Wire Co.,
Ltd.
A-4-6 Preparing Shield of RS-422A/485 Cables
For RS-422A/485 long-distance transmission, if both ends of the shield are grounded, a
large current may flow to the shield due to the difference in ground potential. Therefore,
ground the shields on one end of the cable only.
Host
A-16
Terminal block
Signal name
pin number
1 FG
2 RDB (+)
3 SDB (+)
4 RSB (+)
5 NC
6 RDA (-)
7 SDA (-)
8 RSA (-)
Round type
6.2 mm max.
Recommended
Model
cable size
V1.25-N3A AWG22 to 16
(0.25 to 1.65 mm
VSY1.25-3.5L AWG22 to 16
(0.3 to 1.65 mm
Model
TKV VBS4P-03
NS-AL002
Signal line
PT
RS-422/485 shield
NS-AL002
PT
NS-AL002
PT
Signal direction
Adapter Û Host
Connects to functional ground terminal of PT.
¬
®
®
---
¬
®
®
Round type
Manufac-
Model
turer
J.S.T. Mfg. V1.25-MS3 AWG22 to 16
2
) Co., Ltd.
Molex RAV1.25-3 AWG22 to 16
2
)
Connect to FG on
terminal block.
Recommended
cable size
2
(0.25 to 1.65 mm )
2
(0.3 to 1.65 mm )