Control panel PSB 2000 who makes this ? Manual needed !!

[Gate-boy]

How the gate operates at the moment? Key switch, keypad?

You can locate input by checking loop PCB. Two wires from loop PCB must be for trigger, two for power, and sometimes additional two if loop works as safety device as well.
Find manual for Loop PCB - for me it looks like LD113, which you can get from BFT

This is exactly what i did. Just traced the two wires for opening off the loop card and connected my clonix2  into them.
Was just being lazy and asking for a manual and also I like to collect manuals to add to my ever growing collection for future reference like

PS after further investigation i think this is a custom made board.

Cheers for all the helpful input as usual chaps.