Chapter 3: System operation 
P/N 3102351-EN • REV 005 • ISS 28DEC18  139 
  Description 
  Transformer: Changes 120 or 230 volt AC supply voltage to 24 volt AC. 
  Main AC wiring block and fuse holder: Provides connections for 120 or 230 volt AC (primary 
power) from dedicated service. Includes a primary power fuse (5 A). 
  RS-232 card connector (J3): Provides a connection for the optional RS-
a printer or downloading from the configuration utility. 
  Dialer card connection (J8): Provides a connection for the optional dialer card. 
  Ethernet card connector (J1): Provides a connection for the optional Ethernet card. 
  Main circuit board: Provides connections for all circuits. Also includes the operator interface. 
  Panel backbox enclosure: Houses the panel electronics and standby batteries. In some cases, 
the batteries may be housed in an external battery cabinet (BC-1). 
  Operator interface: Includes operator controls, LED indicators, and control buttons 
  SLC card connector (J14): Provides a connection for an additional SLC card (only on the VS4 
panel). 
  Class A card connector (J2): Provides a connection for the optional Class A card (only on the 
VS1 panel) 
  Tie wrap mounts: Used to secure wires and to help maintain proper separation between power-
limited and nonpower-limited conductors 
  LED expander connector (J6): Provides a connection for the optional LED expander 
  Standby batteries: Provide secondary/standby power to the panel electronics in the absence of 
primary power 
Events with event messages 
Table 42: Events with event messages 
  LCD  Printer [1] 
  Active type reporting     
Input smoke  Alarm active  SMK ACT 
Input smoke verified  Alarm active  SMK ACT 
Input heat  Heat alarm  HEAT ACT 
Input heat rate of rise  Heat alarm  HEAT ACT 
Input duct alarm  Alarm active  DUCT ACT 
Input pull station  Pull station alarm  PULL ACT 
Input waterflow  Waterflow  WFLW ACT 
Input waterflow retard  Waterflow  WFLW ACT 
CO alarm  Gas CO active  COAL ACT