Digital Monitoring Products 1912XR Przewodnik Instalacji Pobierz pdf (Strona 8)

Digital Monitoring Products, Inc. 1912XR Installation Guide

Page 8

1912XR Installation Guide

5.2 Mounting keypads and loop expanders

Security Command keypads have removable covers that allow you to easily mount the keypad to a wall or

other flat surface using the screw holes provided 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 connector 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 a DMP 775, 776, or

778 keypad conduit backbox.

The DMP 711, 714, 715, and 716 expanders are contained in molded plastic housings with removable

covers. The housing base contains the loop expander module and also provides you with mounting holes

for installing the unit to a wall or other surface.

5.3 Connecting serial devices

Keypad data bus

The keypad data bus requires only a 4-wire cable between devices and the panel. You can connect

devices in parallel on the same cable or provide separate runs back to the panel. The maximum cable

length for one keypad can be up to 500 feet using 22 gauge wire or up to 1000 feet using 18 gauge wire.

Additional keypads installed on the same cable decrease the maximum distance at which they'll operate

properly.

Refer to the wiring diagram (section 3.2) in this guide for additional wiring information.

LX-Bus™ (Models 862N, 862P, 872, and 881 Interface Cards)

The LX-Bus provided on these cards also requires only a 4-wire cable between devices and the panel. You

can connect devices together on the same cable with the total cable length for each run being determined

by the number of devices and the gauge of wire being used.

Refer to the table below for determining wiring distances using 22 AWG and 18 AWG.

Note:

This table is provided for convenience in determining approximate wiring distances and gauges only.

Individual installations may vary and support greater or lesser distances due to environmental or other

factors.

# of expansion

devices

Distance when powered

from panel

Distance when powered from

auxiliary power supply *

22 AWG 18 AWG 22 AWG 18 AWG

1 3940' 9875' 7500' 9375'

2 2735' 6855' 7500' 9375'

3 1925' 4830' 7500' 9375'

4 1420' 3565' 7500' 9375'

5 1140' 2855' 7500' 9375'

6 900' 2250' 7500' 9375'

8 700' 1755' 7500' 9375'

10 550' 1370' 7500' 9375'

15 370' 930' 7500' 9375'

20 265' 660' 7500' 9375'

25 200' 495' 7500' 9375'

Figure 5: Expansion device wiring distances

* Locate auxiliary power

supply at the far end of

the wire run.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 35 36

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