
Digital Monitoring Products XR500 Series Canadian Installation Guide
8
InstallatIon
4.3 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,thenumberofdevicesconnected,andthevoltageateachdevice.WhenplanninganLX-Bus™andkeypadbus
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.Whenusing18-gaugewiredonotexceed1,000feet.Toincreasethewirelengthortoadddevices,
install an additional power supply that is listed for Fire Protective Signaling, power limited, and regulated
(12 Vdc nominal) with battery backup.
Note:Eachpanelallowsaspecicnumberofsupervisedkeypads.Addadditionalkeypadsintheunsupervised
mode.Refertothepanelinstallationguideforthespecicnumberofsupervisedkeypadsallowed.
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
ofLX-Busdevicesontherst2,500footcircuitis40devices.
4.Maximumvoltagedropbetweenthepanel(orauxiliarypowersupply)andanydeviceis2.0Vdc.Ifthe
voltage at any device is less than the required level, add an auxiliary power supply at the end of the circuit.
Whenvoltageistoolow,thedevicescannotoperateproperly.
ForadditionalinformationrefertotheLX-Bus/KeypadBusWiringApplicationNote(LT-2031).
Expansion Interface Cards (Models 481, 462N, 462P, and 464-263H)
TheLX-Busprovidedonthesecardsrequiresonlya4-wirecablebetweenthecardandanydevicesconnectedtothe
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.
4.4 Wireless Keypad Association
EnableWirelessKeypadAssociationoperationonboththekeypadandpanel.
To enable association operation in the keypad, access the Installer Options Menu (3577
(INST)) and select RF Survey). The keypad logo LEDs turn on Red until association is
successful.
To enable association operation in the XR500 panel, reset panel 3 times within 12
seconds. Allow the keypad bus Transmit/Receive LEDs to turn back on between each
reset.
For 60 seconds the panel listens for wireless keypads that are in the Installer Options
Menu (3577 CMD) and have not been programmed, or associated into another panel.
Thosekeypadsareassignedtotherstopendevicepositionautomaticallybasedupon
theorderinwhichtheyaredetected.ThekeypadlogoturnsGreentoindicateithasbeenassociatedwiththepanel.
Primary Power Supply
5.1 AC Terminals 1 and 2
Connectthetransformerwirestoterminals1and2onthepanel.Usenomorethan70ft.of16gaugeor40ft.of18
gauge wire between the transformer and the XR500 Series.
Always ground the panel before applying power to any devices: The XR500 Series must be properly
grounded before connecting any devices or applying power to the panel. Proper grounding protects
against Electrostatic Discharge (ESD) that can damage system components. See the Earth ground section.
5.2 Transformer Types
Use Model 327-CAN (16.5 Vac 50 VA) plug-in or Model FTA7516 from ATC Frost.
The transformer must be connected to an unswitched 120 Vac 60 Hz electrical outlet with at least .87A of
available current. Never share the transformer output with any other equipment.
5.3 J12 3-Pin Header for Transformer Types
Place the jumper on the left two pins for a Maximum 2 Amp (Bell=1 Amp; Aux=1 Amp) when using the Model 327-CAN
plug-in transformer (default).
Use an ATC Frost FTA7516 transformer and place the jumper on the right two pins for a Maximum, 3 Amps (Bell=1.5
Amp; Aux=1.5 Amp).
Secondary Power Supply
Programming
J8
XMIT
RCV
Figure 5: Keypad Bus LEDs
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