tx 870 machine no.

I have a tx870 that had been removed from a location and stored.I need to install it in a new site and change the machine id No.To do this I need to access the engineers prog.does anyone know the engineers code?. It was orig part of an irc set up with 3 other tills and was designated a slave I intend to connect to epos hq office software through a modem to my office.I have set up the office end. do I need to change the till designation to master?