Omron V680-CA5D01-V2 User Manual page 41

SECTION 2
Installation, Connections, and Wiring
RS-422/RS-485 Port
Pin Arrangement
Pin No.
1
2
3
4
5
Note: The port can be used as an RS-485 port if terminals 1 and
3, and 2 and 4 are short-circuited.
Connections to Host Device
RS-422 Connections
Host device
SDA( − )
SDB( + )
RDA( − )
RDB( + )
SG
GR
Note: Ground the shield at the host device to prevent operation errors.
RS-485 Connections
Host device
−
+
Note: Short-circuit terminals 1 and 3, and 2 and 4. Do not connect anything to the ID Controller signal ground.
RDA(−) RDB(+) SDA(−) SDB(+) SG
Reception
terminating
resistance
RFID System
38
User's Manual
Name Details
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
Transmission
terminating
resistance
• Controller Terminal Arrangement
Terminal No.
Terminating resistance: 220 ( Ω ) for RS-422, 110 ( Ω ) for RS-485
Note: Turn ON terminating resistance only at the ID Controllers at the both ends
of the trunk cable. Turn OFF the terminating resistance at all ID Controllers
in between. Normal transmissions will not be possible if terminating
resistance is turned ON for the ID Controllers in between.
1 2 3 4 5