Wiring a 1-Wire thermometer

Digital thermometers (typically DS18B20) can be connected on the 1-Wire port — even several on the same wire.

Wiring

To wire the thermometer, connect three wires to the server LOW VOLTAGE INPUTS terminal row:

FunctionServer terminal
+5 V supply5V
GNDG
1-Wire data1W
The pull-up resistor required for the bus is already built into the central unit, so no extra part is needed — the thermometer can be wired directly.

Several thermometers on one bus

Every 1-Wire device has a unique factory-burned address, so several thermometers can be daisy-chained on the same data wire. The system distinguishes them automatically by address.

  • The thermometers can be wired in parallel, onto the same three wires.
  • Each sensor is identified by its own address — no address setting is required.
  • Keep cabling short, inside the cabinet, or use documented Smartive cabling.