Allstar 3000, 3500, 3500-P & J3500

Allstar 3000 openers manual can be found here.
Garadget connections are terminals #0 and #1 (push button connection).

The opener must be equipped with the obstacle detection device:

Momentary Contact To Close: After installing an Allstar Access All-Clear™ Photosystem Auxiliary Entrapment Protection Device the close operation mode is automatically converted to momentary contact of the mechanical Push Button, and a portable Radio Transmitter can be used to close the door. (PageZ16)