Chapter 3: System operation 
Vigilant VS1 and VS2 Technical Reference Manual  143 
Component descriptions 
The control panel contains the following components. 
Figure 54: Component layout 
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Item Description 
1  Transformer: Changes 120 or 230 volt AC supply voltage to 24 volt AC. 
2  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). 
3  RS-232 card connector (J3): Provides a connection for the optional RS-232 card for 
connecting a printer or downloading from the configuration utility. 
4  Dialer card connection (J8): Provides a connection for the optional dialer card. 
5  Ethernet card connector (J1): Provides a connection for the optional Ethernet card. 
6  Main circuit board: Provides connections for all circuits. Also includes the operator 
interface. 
7  Cabinet enclosure: Houses the panel electronics and standby batteries. In some 
cases, the batteries may be housed in an external battery cabinet (BC-3).