With the installation of PC5401/4401 Data Interface Modules by DSC,
PowerSeries and MAXSYS control panels are able to interface with leading
manufacturers of home and building automation products and audio
distribution systems to create seamless, fully integrated control solutions.
The modules feature a bi-directional RS-232 interface that accepts commands and
sends event-driven or state-change commands to third-party applications and back
to the control panel to create shared functionality. For example, once a security
system is disarmed upon entry, the PC5401/4401 can be programmed to turn on the
lights or send a command to a house’s HVAC system to automatically raise 
the thermostat.