Some controllers can be used with either a 3 position toggle or rocker to give forward/off/reverse or with two push buttons to give ‘go forward’ and ‘go reverse’ control.
The DNO and Pro series need an extra diode in the wiring. Details are in the page Pushbuttons Wiring, Pro and DNO. A speed pot is permanently connected and left set to the desired speed. Then a signal is applied either to the ignition input – when the controller will start up and operate in forward mode, or to the reverse input – when the controller will start up and operate in reverse.
With controllers that have high pot lockout this needs to be disabled if using push buttons as this prevents the controller working if a demand speed is present when the controller is switched on.
However the 4QD series have an inhibit input can be thus used, but requires a little ingenuity. Details are in an application note.