TCW241_R4.17
–
October 2022
Page 8
6.2.4.
Sensor connection
Up to eight 1-Wire sensors can be connected to TCW241. The device supports following sensors -
temperature, temperature/humidity, CO2, DC current, AC current, 4/20mA, galvanic isolated
analog voltage, barometric pressure etc. Connected sensors are automatically detected and
appropriate dimension is assigned.
1-Wire is a registered trademark of Maxim Integrated Products, Inc. It is designed to connect
several sensors over a short wiring. It is not suitable for long distances or environments with EMC
interference.
We recommend reading Maxim’s 1
-Wire tips at http://www.maxim-ic.com/app-
notes/index.mvp/id/148.
The sensors have three wires
–
positive voltage (+VDD), ground (GND) and bidirectional data
(Data). The colors of wires for every sensor are specified in its user manual.
It is strongly recommended to use
“daisy
-
chained” (linear topology) for multiple sensors:
“Star” topology can be used only as a last resort for up to 4 sensors and
total cable length up to 10
meters:
Connections can be realized either by screw terminal connector or by a standard RJ-11
connector.
There are many parameters which determine the maximum length of the wires
–
the type of
cable, the number of sensors, ambient electromagnetic noise and sensor network topology.
Summary of Contents for TCW241
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