714/715 Installation Guide | Digital Monitoring Products 4
ADDITIONAL INFORMATION
Wiring Specifications
DMP recommends using 18 or 22 AWG for all LX‑Bus and Keypad Bus connections. The maximum wire distance
between any module and the DMP Keypad Bus or LX‑Bus circuit is 1,000 feet. To increase the wiring distance, install
an auxiliary power supply, such as a DMP Model 505‑12. Maximum voltage drop between a panel or auxiliary power
supply and any device is 2.0 VDC. If the voltage at any device is less than the required level, add an auxiliary power
supply at the end of the circuit.
To maintain auxiliary power integrity when using 22‑gauge wire on Keypad Bus circuits, do not exceed 500 feet.
When using 18‑gauge wire, do not exceed 1,000 feet. Maximum distance for any bus circuit is 2,500 feet regardless of
wire gauge. Each 2,500 foot bus circuit supports a maximum of 40 LX‑Bus devices.
For additional information refer to the following documents:
▶ LX‑Bus/Keypad Bus Wiring Application Note (LT‑2031)
▶ 710 Bus Splitter/Repeater Module Installation Guide (LT‑0310)
Optional Accessories
You can replace the standard wiring harness with the optional 718T Plug‑in Screw Terminal. The enclosure base can
also accommodate the 719T Terminal Boards for the 714 or the 720T Terminal Boards for the 715, both of which pass
through panel LX‑Bus wiring. The 719T includes 1k EOL resistors. The 720T includes 3.3k EOL resistors.
LED Operation
The LED on the zone expanders flashes each time the module responds to a poll from the panel. If there is a problem
with the hardware, panel programming, or the green data wire between the panel and the zone expander module, the
LED stops flashing and System Trouble appears in the keypad display.
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