Hi Justin,
If it was unidirectional my first guess would be one of the infrared
remote protocols. But since it's bidirectional, who knows, but it's
still possible.

Cheerful regards, Bob

On Fri, Oct 9, 2015, at 01:06 AM, Justin Richards wrote:
> One of the remaining device to web enable at home is a Celair Evaporative
> Aircondioner.
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> I have limited test gear at home, mainly an Analog CRO so hoping someone
> would like to hazard a guess as to what protocol the controller uses to
> get
> me going in the right direction
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> It uses a 4 pin comms cable, so I figure 2 for power and 2 for protocol.
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> There is about 30m of cable and assuming bi-directional as it provides
> control and status.
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> The best link I could find to an image is here ...
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> www.ebay.com.au/itm/CLIMATE-BONAIRE-CELAIR-WALL-CONTROL-PART-6051630SP-/1=
61789585679?hash=3Ditem25ab69290f
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> I know there is not much to go on so welcome any tidbits of info.
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> Cheers justin

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