>> I know the connector it is very unusual and never seen it on a laptop
>> but the charger itself is identical the one you get on laptops. I am not
>> quite sure why their are four connectors though.
>>
You might find that the PSU has remote sense i.e. two of the wires are supplying the +ve and -ve to the the till and the other two are feeding back the voltage at a reference point inside the till to the PSU, so it can adjust the exact output voltage as necessary.
..or they've just done it to tie you in to their bespoke PSU....
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