Installation guide

Digital Monitoring Products XR2500F Installation Guide

INSTALLATION

XR2500F Installation Guide Digital Monitoring Products

INSTALLATION

14.4 Mounting Keypads and Zone Expansion Modules

LCD keypads have removable covers that allow you to easily mount the keypad to a wall or other at surface

using the screw holes on each corner of the base. Before mounting the base, connect the keypad wire

harness leads to the keypad cable from the panel and to any device wiring run to that location. Then attach

the harness to the pin connector on the PC board, mount the base, and install the keypad cover making sure

all of the keys extend through their respective holes.

For mounting keypads on solid walls, or for applications where conduit is required, use the Model 695 1-1/2”

deep or the Model 696 1/2” deep backboxes.

The DMP 711, 712-8, 714, 715, 716, and 717 modules are each contained in molded plastic housings with

removable covers. The base provides you with mounting holes for installing the unit to a wall, switch plate,

or other surface.

14.5 Connecting LX-Bus and Keypad Bus Devices

Several factors determine the DMP LX-Bus™ and keypad bus performance characteristics: the wire length and

gauge used, the number of devices connected, and the voltage at each device. When planning an LX-Bus™

and keypad bus installation, keep in mind the following information:

1. DMP recommends using 18 or 22-gauge unshielded wire for all keypad and LX-Bus circuits. Do not use

twisted pair or shielded wire for LX-Bus and keypad bus data circuits.

2. 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 UL listed for Fire Protective Signaling, power limited, and

regulated (12 VDC nominal) with battery backup.

Note: Each panel allows a specic number of supervised keypads. Add additional keypads in the

unsupervised mode. Refer to the panel installation guide for the specic number of supervised keypads

allowed.

3. 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 LX-Bus devices per 2,500 feet circuit is 40. When using the on-board J22 LX-Bus, the

maximum number of LX-Bus devices per 2,500 foot circuit is 25. See J22 LX-Bus Expansion Connector

section later in this document.

4. Maximum voltage drop between the panel (or auxiliary power supply) and any device is 2.0 VDC. If the

voltage at any device is less than the required level, an auxiliary power supply should be added at the end

of the circuit.

For additional information refer to the LX-Bus/Keypad Bus Wiring Application Note (LT-2031) and/or 710/

710F Installation Sheet (LT-0310).

Expansion Interface Cards (Models 481, 462N, 462P, 462FM, and 472)

The LX-Bus provided on these cards requires only a 4-wire cable between the card and any devices

connected to the bus. You can connect devices (zone or output expansion modules) together on the same

cable or provide separate runs back to the card. Each LX-Bus provides up to 100 zones or outputs.

Note: Do not use twisted pair or shielded wire when connecting an LX-Bus or keypad bus.