semaphore KINGFISHER PLUS+ Hardware Reference Manual page 101

Kingfisher Plus+ Hardware Manual
RS-485 Wiring Diagram
Each RTU can transmit/receive to any RTU, one at a time. Up to 32 RTUs (or other RS-485
devices) can be connected to the RS-485 bus. Maximum RS-485 wire length: 1200 m.
If the ground wire is not available, each GND terminal can be tied to EARTH locally via
100 Ω 0.5 W resistor. If the 100 Ω resistor is not available, the Ground wire can be
connected directly to EARTH.
For short cable runs (less than 5 m) a single 60 Ω terminating resistor can be used at one
end of the RS-485 cable.
RS-422 Wiring Diagram
The master RTU can transmit/receive to any one outstation RTU at any time or each
outstation can transmit/receive to the master RTU, one at a time. Note: outstation RTUs
cannot communicate with each other. Up to 10 RTUs (or other RS-422 devices) can be
connected to the RS-422 bus. Maximum RS-422 wire length: 1200 m.
If GND wire is not available, each GND terminal can be earthed locally via 100 Ω 0.5 W
resistors. If the 100 Ω resistor is not available, the Ground wire can be connected directly to
EARTH.
Hardware Manual Version 7.16 http://www.servelec-semaphore.com/ Page 101