X-320M™ User's Manual
Installation and Setup
2.2.5 Digital Temperature/Humidity Sensor Connection
The digital sensors use a one-wire data bus, which allows up to six sensors to share the same terminals
(+5V, Ground, Data). Every sensor on the one-wire bus is assigned a unique serial number when it is
manufactured. That number is used to address the device during communication.
Note: The adapter board for the Davis Instruments ISS (X-MDA-1) is an exception to the typical sensor
addressing. When the X-MDA-1 is used with an ISS, the temperature and humidity sensors use the
same address.
The sensors have three wires; the wire color is show in the table below.
Sensor Wire Color Connection
Red
5V out
Black
Gnd
Blue (or White)
Data
Xytronix Research & Design, Inc.
Page 23
Figure 2.2h - Temperature Sensor
Figure 2.2g - 1-Wire Sensor Connection
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