Omron V600 Series User Manual page 32

Section 2
Installation and Wiring
RS-422/RS-485 Port
Pin Arrangement
Pin No.
1
2
3
4
5
*Using RS-485 is possible by shorting pins 1 and 3 and
pins 2 and 4, and changing the setting to RS-485.
■ Connecting to the Host Device
■
RS-422 Connection
Host device
SDA()
SDB()
RDA()
RDB()
SG
GR
Note. Ground the shield at the host device to prevent malfunctions.
The +/ polarity designations for the SDA, SDB, RDA, and RDB signals are reversed on some devices. Always check
the signal names of the connected device and connect the polarity correctly.
■
RS-485 Connection
Host device


Note. Short pins 1 and 3 and pins 2 and 4 Do not connect
anything to the ID Controller's SG.
The internal circuits are as follows:
RDA() RDB() SDA() SDB() SG
Receiving side
terminating resistance
RFID System
30
Operation Manual
Name Description
RDA() Receive data
RDB(+) Receive data
SDA() Send data
SDB(+) Send data
SG SG
(Shield)
ID Controller
RDA()
RDB()
SDA()
SDB()
SG
ID Controller
RDA()
RDB()
SDA()
SDB()
SG
Sending side
terminating resistance
• Pin Arrangement
Pin No.
Terminating resistance: RS-422: 220 , RS-485: 110 
Note: Turn ON the terminating resistance at the nodes on both ends of the main cable.
Turn OFF the terminating resistance at all other nodes. Normal transmissions will not
be possible if the terminating resistance is ON at any node other than the end nodes.
1 2 3 4 5