Omron NT21, Руководство по установке

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3-2 Section Connecting Link Adapters
21
Pin
Signal direction
(Link Adapter
⇔
NT21)
Code Signal name
9 Signal ground SG ---
Connector
hood Function ground FG ---
RS-422A/485 Terminal Block
Pin Signal name Code
Signal direction
(Link Adapter
⇔
RS-422A/485 device)
1 Frame ground FG Connects to the Unit’s
functional ground terminal.
2 Receive data (+) RDB (+) Link Adapter
←
Device
3 Send data (+) SDB (+) Link Adapter
→
Device
4 Request to send (+) RSB (+) Link Adapter
→
Device
5 No contact NC ---
6 Receive data (–) RDA (–) Link Adapter
←
Device
7 Send data (–) SDA (–) Link Adapter
→
Device
8 Request to send (–) RSA (–) Link Adapter
→
Device
Compatible Crimp Terminals
Use crimp terminals for M3 screws.
Fork terminal
6.2 mm max.
Round terminal
6.2 mm max.
Maker Style Model Compatible wire
J.S.T. Mfg Co., Ltd. Fork V1.25-N3A AWG22 to AWG16
(0 2
1 6
2
)
g ,
Round V1.25-MS3
(0.25 to 1.65 mm
2
)
Molex
Fork VSY1.25-3.5L
AWG22 to AWG16
(0 3
1 6
2
)
Round RAV1.25-3
(0.3 to 1.65 mm
2
)
When using RS-422A or RS-485 cables for long-distance communications, do
not ground the shield at both ends of the communications line because large cur-
rents can flow through the shield due to the difference in potential at the two
grounding points. We recommend grounding the shield at one end, as shown in
the following diagram.
Signal line
Host
RS-422A/485
shield
PT
PT
PT
NS-AL002
Connect to FG on the
terminal block.
RS-422A/485 Cable
Shield Connections