There are 6 different Fyreye detector bases available for the conventional range of detectors, namely, common base, diode base, relay base and the 6" versions of these three bases.
The common base is used on systems that don't need to keep line integrity on head removal, and also on addressable systems.
The Diode base is used on systems that do need line integrity on head removal. This would include all conventional systems that mix detectors & call points on the same line. (Note that the premier M, MZ & L will need an active end of line to work with diode bases).
The Relay base is mainly used on 12V security systems to signal detector operation to the panel. They can also be used on 24V fire systems where the activation of a particular detector requires a signal to nearby equipment (door holders for example).
