800-641-4282
www.dmp.com 2500 North Partnership Boulevard
LT-1170 © 2011 Digital Monitoring Products, Inc.
11385
Additional Power Supply
If the current draw for all keypads exceeds the panel output, provide additional current by adding a Model 505-12 auxiliary
power supply. Connect all keypad black ground wires to the power supply negative terminal. Run a jumper wire from the
power supply negative terminal to the panel common ground terminal. Connect all keypad power (+12 VDC) wires to the
power supply positive terminal. Do NOT connect the power supply positive terminal to any panel terminal. Refer to the
505-12 Power Supply Installation Guide (LT-0453).
FCC Information
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modications made by the user and not expressly approved by the party responsible for compliance could void
the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Wiring Specications for Keypad Bus
When planning a keypad bus installation, keep in mind the following specications:
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. 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. Install an additional power supply
to increase the wire length or add devices.
2. Maximum distance for any one 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.
3. Maximum number of devices per 2,500 feet circuit is 40.
Note: Each panel allows a specic number of supervised keypads. Add additional keypads in the unsupervised mode.
Refer to the panel installation guide for the specic number of supervised keypads allowed.
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, add an auxiliary power supply at the end of the circuit. When voltage is too
low, the devices cannot operate properly.
Refer to the LX-Bus/Keypad Bus Wiring Application Note (LT-2031) for more information. Also see the 710 Module
Installation Sheet (LT-0310).
Specications
Operating Voltage 12 VDC
Dimensions 5.76” W x 8.76” H x 2.75” D
Compatibility
All DMP panels
