Features and Functions
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Depending on the type of card involved, a signal card can control either two, four, or six points (circuits) of bells,
horns, strobes, speakers, or phones. Other features are:
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No point may draw more than two amps of 24VDC power.
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Constantly monitors its points for opens or shorts.
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Automatically prevents shorted points from operating.
NOTE:
Although 2, 4, and 6-point signal cards are available, a card’s motherboard is always labeled in six-circuit
increments (SIG3 thru SIG8, SIG9 thru SIG14, SIG15 thru SIG20 etc.).
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Each card’s available signal circuits are listed in the Programmer Report that accompanies the system
(and which can be generated by using the Programming Unit).
Example:
If a system features a 2-point signal card in the motherboard labeled SIG9 thru SIG14, the
system’s programmer report will list SIG9 and 12 (card output points 1 and 4) as available, and
SIG1 0, 11, 13 and 14 (output points 2, 3, 5 and 6) as unavailable.
Component Locations and Functions (Figures 18 and 19)
LED1
Lights when communication is lost with the Master Controller.
IC 1 (Single Channel Cards)
The 246-399 masked chip contains the card’s program and is found only on single channel cards.
U 1 (Multichannel Cards)
The 740-666 programmable EPROM contains the card’s program and is found only on multichannel cards.
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