Any system that is based on a microprocessor must have software that gives it instructions on what to do. The way a manufacturer does this is considered a trade secret since it requires a lot of time and effort to engineer a successful system. The buzz word for this software is "Source Code." This is typically proprietary with all elevator manufacturers.
The issue is really an issue of diagnostics. Proprietary diagnostics would only allow the manufacturer to diagnose problems by retrieval of fault codes. The diagnostics also allow adjustment of control parameters and performance safety tests.
These systems can be made Non-Propreitary by supplying a laptop computer, hand-held tool with display, or built-in keyboard, pad and display, the appropriate passwords and documentation on adjustments and fault diagnosis.
Non-Proprietary Diagnostics allows alternate elevator contractors to provide maintenance should the manufacturer's performance be less than expected. This also minimizes the Owner being held hostage by a manufacturer who can dictate their maintenance price and say "who else are you going to get to work on this equipment?" The use of these diagnoistic capabilities should only be utilized by a professionally trained elevator mechanic familiar with the brand and type of equipment.
