DMP Electronics 734N-WIFI, Инструкция по установке и программированию

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Digital Monitoring Products, Inc. | 734N-WIFI Installation and Programming Guide 29
Refer to the following Keypad bus/AX-Bus/LX-Bus wiring specifications.
• DMP recommends using 18 or 22-gauge unshielded wire for all keypad and AX-
Bus/LX-Bus circuits. Do not use twisted pair or shielded wire for AX-Bus/LX-Bus
and keypad bus data circuits. All 22-gauge wire must be connected to a power-
limited circuit and jacket wrapped.
• On keypad bus circuits, to maintain auxiliary power integrity when using 22-gauge
wire do not exceed 500 feet. When using 18-gauge wire do not exceed 1,000 feet.
To increase the wire length or to add devices, install an additional power supply
that is listed for Fire Protective Signaling, power limited, and regulated (12/24VDC
nominal) with battery backup.
Note: Each panel allows a specific number of supervised keypads. Add
additional keypads in the unsupervised mode.
• Maximum distance for any one bus circuit (length of wire) is 2,500 feet regardless
of the wire gauge. This distance can be in the form of one long wire run or multiple
branches with all wiring totaling no more than 2,500 feet. As wire distance from
the panel increases, DC voltage on the wire decreases. Maximum number of AX-
Bus/LX-Bus devices per 2,500 feet circuit is 40 feet.
• Maximum voltage drop between the panel (or auxiliary power supply) and any
device is 2.0VDC. If the voltage at any device is less than the required level, add
an auxiliary power supply at the end of the circuit. When voltage is too low, the
devices cannot operate properly.
For additional information refer to the panel's Installation Guide, the 710 Installation Sheet
(LT-0310), and/or the LX-Bus/Keypad Bus Wiring Application Note (LT-2031).
KEYPAD BUS WIRING SPECIFICATIONS