The parameters are kept in memory by the use of the 3 AA back up batteries.
If you remove the batteries with the control OFF, you will lose the parameters.
THUS, keep the control ON when replacing these batteries.
All interact machines in the USA came with a red box that contained the manuals and a hard copy of the parameters. Most are generic, but a few are machine specific such as backlash, and distance of travel to each side of the home switch.