ADEMCO VISTA-128B Guia de preparacion Pagina 37

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5-1
SECTION 5
Installing The Keypads
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In This Section
Keypads That May Be Used
Wiring to the Keypads
Using a Supplementary Power Supply to Power Additional Keypads
Mounting the Keypads
Addressing the Keypads/Preliminary Checkout Procedure
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Keypads That May Be Used
2-line alpha display, 6139.
Up to 16 addressable keypads may be used in the system, independent of auxiliary power
considerations (you may need to use an auxiliary power supply if the 750mA aux. output
is exceeded)
Wiring to the Keypads
1. Determine wire gauge by referring to the wiring length/gauge chart below.
2. Wire keypads to a single wire run or connect individual keypads to separate wire runs.
The maximum wire run length from the control to a keypad, which is homerun back to
the control must not exceed the lengths listed in the table.
Wire Run Length Table
Wire Gauge Length
#22 gauge 450 feet
#20 gauge 700 feet
#18 gauge 1100 feet
#16 gauge 1750 feet
1.
The length of all wire runs combined must not exceed 2000 feet when unshielded quad
conductor cable is used (1000 feet if unshielded cable is run in conduit or if shielded cable is
used).
2.
If more than one keypad is wired to a run, then the above maximum lengths must be divided
by the number of keypads on the run (e.g., the maximum length is 225 feet if two keypads are
wired on a #22 gauge run).
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