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What kind of protocol is used in NIDAC PRE keypad?

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fastbike

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Hi

I would like to use a NIDAC PRE keypad with my system - but do not have access to the protocol used to transmit the data.

This keypad has the following keys:
0-9,*,# and E(nter)

It also has two LEDs and a piezo beeper.

It has a 4 wire interface:
- black = ground
- white = data & power
- red = red LED
- blue = green LED

What's interesting is that the white wire is used to power the keypad AND to transmit the code that is entered.

Does anyone know how this is done and what hardware/software protocol is used.

Cheers

D

You can find more info on this keypad at
**broken link removed**
 

NIDAC PRE protocol

could be current loop that is the easiest way to get powered and send information back.

Find a scope and see what is going on wire. If codes are not cyphered (that one i dont believe they will do with stupid keypad) you'll get it all for a couple of minutes.
 

Re: NIDAC PRE protocol

Hi Artem,

I'm trying to figure out the protocol before I buy onw of these.

Also, I don't want to buy their controller - but use the keypad to control my own circuit.

So I can't hook up a scope as there's nothing to hook it up too.

I was hoping somebody could post a link.
 

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