Omron V680-CA1D User Manual page 36

Section 2
Installation, Connections, and Wiring
Wiring Example
Use an RS-485 Interface Cable with a shield, and connect the shield to the ground terminal.
• 1:N Connection
Host device
with termi-
nating resist-
ance
Set SW 3.7
Terminating
resistance (ON)
Note
If the recommended cables are not used, wire the RS-485 interface cable and synchronous cable in
parallel. The environment-resistive noise characteristic may be reduced even when wired in parallel,
however, if the following configurations shown in examples 2 and 3 are used.
Example 1
Synchronous cable
RS-485 interface cable
* Noise source: Other devices, power lines, AC Adapters, etc.
Heat-resistive RFID System
34
User's Manual
Set SW 3.7
No terminating
resistance (OFF)
Set SW 3.7
No terminating
resistance (OFF)
Noise
source
Total length: 300 m max.
Set SW 3.7 Set SW 3.7
No terminating No terminating
resistance (OFF) resistance (OFF)
Total length: 300 m max.
Set SW 3.7
No terminating
resistance (OFF)
Host device
with no ter-
minating re-
sistance
Example 2
Synchronous cable
Noise
source
RS-485 interface cable
Set SW 3.7
Terminating
resistance (ON)
Set SW 3.7
Terminating
resistance (ON)
Example 3
Synchronous cable
Noise
source
RS-485 interface cable