Hi all,

 

So I was looking at the Scantronic I-ON panels and I read something about 'Daisy Chaining' or BUS Wiring - Where you can install the devices - from one to the other.

 

Can someone explain if this actually works? and how it is done? ...and how does it work?

 

....does this work for PIRs? or only Key Pads?

 

Thanks

 

BUS detection devices would only be compatible with certain compatible control units and there matching manufacturer.

Most modern equipment utilises some data BUS type wiring for the keypads and zone expanders, which I believe is the case for the iON.

Essentially each device has an address so they can be identified back at the control and they all communicate and get powered from the same line.

Often this is wired as a pair for power and pair for data.

 

As above

Think

O----O----O etc

One after the other. Most manufacturers do it for keypads and expanders. Some do it for detection too

On the i-ON side, that bus daisy chain is mainly for keypads, expanders and other addressable devices. Ordinary PIRs still go on the zone wiring unless you specifically bought bus detectors that match the panel. Same idea as the O----O----O layout already mentioned, just worth knowing PIRs are not automatically on that bus.

On 30/09/2026 at 11:44, Jeremy C said:

On the i-ON side, that bus daisy chain is mainly for keypads, expanders and other addressable devices. Ordinary PIRs still go on the zone wiring unless you specifically bought bus detectors that match the panel. Same idea as the O----O----O layout already mentioned, just worth knowing PIRs are not automatically on that bus.

What bus detectors?

By bus detectors I mean PIRs built with the panel's own addressable bus interface, rather than a conventional relay-output PIR. They are enrolled as individual devices and report alarm and tamper over the bus, so the panel has to support that exact detector family. A quick way to identify one is that its manual specifies bus addressing and current draw, not just terminals for alarm and tamper contacts. If you add one, check the panel's permitted bus cable length and total current, then measure voltage at the furthest detector during a walk test, since a marginal supply can cause intermittent device faults.

I cannot think of a single IAS system that allowed detection devices connected directly to a system bus/data line. There have been a few that connect via a single interface such as ID biscuits or Securicor's Genesis system which used MLI's. I am not saying there isn't such a thing but I just cannot recall anything that did this.

53 minutes ago, Jeremy C said:

By bus detectors I mean PIRs built with the panel's own addressable bus interface, rather than a conventional relay-output PIR. They are enrolled as individual devices and report alarm and tamper over the bus, so the panel has to support that exact detector family. A quick way to identify one is that its manual specifies bus addressing and current draw, not just terminals for alarm and tamper contacts. If you add one, check the panel's permitted bus cable length and total current, then measure voltage at the furthest detector during a walk test, since a marginal supply can cause intermittent device faults.

It's not what I am asking , I am asking what "bus" detectors did you think Eaton scantronics have ?

Generally speaking most panels are using a bus these days for there keypads expanders etc

But none of them use bus data pirs except 1 or 2

Edited 16 hours ago16 hr by al-yeti