The Basics of Daisy Chaining

A daisy chain is a wiring strategy where multiple devices are wired together in sequence. This is similar to the way in which flowers can be linked together to form chains or rings, using flower stems as a chain to connect each flower to one another.

In this example, a pressure transmitting cell is the “daisy” and a circuit loop is the “chain.”

A standalone two-wire transmitting circuit is made up of one transmitter, one receiver, and one power supply as shown below.

Standard Single Loop Transmitter Circuit

With a daisy-chained setup, you can use multiple pressure cells and receivers with only one power supply. Devices based on USB, Thunderbolt, FireWire, and Ethernet cables can each be used to form daisy chains.

Daisy-Chaining Transmitter Circuit

The amount of cells you can add to a daisy chain will be dependent on the power supply’s power rating.  You will want to make sure that the total current consumption on the loop is less than the output power rating on the supply.

Dwyer has several products which are able to be daisy-chained together, including air velocity transmitters, Series AVUL and AVLV, and communicating carbon dioxide sensors, Series CDTA and CDTC.

Utilizing a daisy-chain setup allows you to save both time and money. This system has a shorter installation time than installing all devices individually, and saves costs by using only one power supply for several products.

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