Specifications
LR-2000 Manual V1.4 Page 18 of 20
11.6 WIRING
Wiring an LR-2000 reader is not the same as wiring other reader types. For the Wiegand interface, Data-0 and Data-1
lines are the same, but all other wires are different.
Study the wiring diagram in Figure 3. Compare the actual wiring with this wiring diagram.
The reader must be armed to transmit its RF field. To arm the reader, its yellow wire must be connected to its black wire.
• To transmit RF only when a vehicle is present at the reader, use a buried loop or other vehicle sensor with relay contacts
that connect the yellow and black wires temporarily.
There must be no connection between the reader’s power supply and the host system’s panel – not even a ground connection.
The power supply must be floating.
The reader’s drain wire and the cables’ shields must be connected together, but they must not be grounded. These shields
must be floating. (Induced noise is drained inside the LR-2000 reader.)
Never connect 2 readers’ data lines in parallel on one reader input port. Always use a separate port for every reader.
This preserves the data pulse shape, and allows each reader to have its own address in the host system.
To bypass a problem in the cable, wire the LR-2000 reader directly to the panel’s reader input port.
• Connect the reader’s 3 data wires directly to the panel’s reader input port – green to Data-0, white to Data-1, and blue
to Data-Common on the same reader port. If there is no terminal labeled “Data-Common” on that reader port, connect
the blue wire to the electrical Ground or Common terminal on that reader port, which serves as data-common also.
• Use an independent DC power supply that meets AWID’s specifications fully (Section 11.4). Do not connect the reader’s
black and red wires to the panel.
• If the reader now operates normally, there may be a problem in the cable or its junctions, or in the conduit.
Check the unused wires on the reader.
• The unused wires must not touch each other or anything else. Tape them off singly.
• The violet and brown wires are never used. They should be separately taped or capped.
• The orange wire is used by the SP-6820-LR test unit (part of the LR-2000KIT Test & Set-up Kit). Keep this wire
continually accessible for testing.
For RS-232 serial interface, see AWID’s Technical Reference “RS-232 Interface”. Download it from www.awid.com/support
11.7 GROUNDING
The LR-2000 reader has no grounded wires. Three wires are used as common or negative wires – black wire
for power supply negative, blue wire for data-common, and drain (uninsulated) wire for shield draining.
• These 3 wires must be wired correctly as shown in Figure 3. These 3 wires must not be connected to each other.
• The reader’s yellow wire must be connected to the black wire to arm the reader for RF transmission. (See Section 11.6.)
The reader’s power supply DC negative and the panel’s electrical ground must be kept separate.
• Do not wire these two negatives together. Let the power supply’s secondary (DC) side float.
• The panel and readers must be powered by different DC power supplies (or isolated outputs in a multi-channel supply).
Check the reader’s drain wire (copper stranded wire without insulation).
• The drain must be tied to the shield of the cables between the reader and the panel, and between the reader and the power
supply – but the shields must not be grounded anywhere. The shields must float. (Draining occurs inside the reader.)
Measure voltage between earth-ground and the system’s electrical ground.
• Voltage must not exceed a few tenths of a volt in AC or DC. If it does, have a qualified electrical contractor check the
3-wire 120 VAC grounded power line and receptacle that feeds the DC power supply for both the panel and the reader.
• Check that the 120 VAC green wire is at earth-ground. Check that the black and white AC wires are not reversed
at a receptacle or junction.