2 Minute Read

| Overview

Not all parts of a room experiences similar conditions, we at 75F truly believe in that. Hence, to clearly monitor the conditions of a room, provide the necessary conditioning monitoring with only one sensor is not sufficient.

To tackle the problem 75F introduced a portfolio of sensors that can be mounted at different parts of the room, but the problem end there.

The Room controllers/ master devices, SmartNode, SmartStat and HyperStat were provided with just one port to accommodate just one sensor, apart from the onboard ones (as applicable).

This led to bringing in the daisy chaining capabilities in all the latest sensor releases, and a wiring harness to support the daisy chaining of the sensors in a bus network.

| Wiring Harness for Daisy Chaining


This wiring harnesses is made of one 3 wire female connector and one end, and two male connectors at the other end. This can be plugged to the daisy chain ports provided in the sensors for power and communication.

When the above wiring harness is combined with the 3 Pin to 3 Pin cable of lengths 18 inch, 20, 30 and 50 feet. the daisy chaining can be achieved


| Daisy Chaining Rules

Below are the rules to be followed while daisy chaining sensors in a bus:


  • A maximum of 4 one wire interface devices can be connected in a bus
  • A maximum of 4 multi sensors can be supported in a bus 
  • A maximum of 3 duct sensors can be supported in a bus.
  • A maximum of 1 differential pressure can be supported in a bus.
  • A maximum of 1 device of Ceiling/Flush/Wall sensor can be supported in a bus.

| Examples

Below is an illustration for the daisy chaining example for the Multi Sensor

Daisy Chaining Multi Sensor 


When Daisy Chained

  • Not more than 4 Multi Sensor can be daisy chained.
  • The temperature, Humidity and CO2 to the master is average of the values from all the Multi sensors
  • The occupancy detection for the master device is when occupancy is detected at least by one Multi Sensor in the bus.


Daisy Chaining Multi & Wall Sensor





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