LPT-11 Link Power Twisted Pair Transceiver
Models 50040-02 and 50040R-02
Description
The LPT-11 Link Power Twisted Pair Transceiver provides
a simple, cost-effective method of adding a network-powered
L
ONWORKS transceiver to any Neuron
®
Chip-based control
system.
The link power system sends power and data on a
common twisted wire pair, and allows the user to install LPT-
11 transceivers with virtually no topology restrictions. Power
is supplied by a customer-furnished nominal 48VDC power
supply
, flows through the LPI-10 Link Power Interface Module
where it is regulated to 42.4VDC, and then passes onto the
twisted wire pair. The LPT
-1
1 transceiver eliminates the need
to use a local power supply at each node since node power is
sent from a central power supply over the same twisted wire
pair that handles network communications.
The LPT
-11 transceiver consists of a Single In-Line
Package (SIP) containing a 78kbps differential Manchester
coded communication transceiver, a power supply that extracts
power from the twisted pair network, and connections for the
Neuron Chip Communications Port (CP) lines and twisted pair
network.
The LPT-11 transceiver supports free topology wiring,
freeing the system installer from the need to wire in a bus
topology. Star, bus, and loop wiring are all supported by this
architecture. Free topology wiring reduces the time and
expense of system installation by allowing the wiring to be
installed in the most expeditious manner. It also simplifies
network expansion by alleviating the need for the installer
to follow strict rules about stub lengths. Should it be necessary
to add more nodes or wire runs in excess of 500 meters, link
power segments can be interconnected by a router or a physical
layer repeater.
Model 50040R-02 is compliant with the European Directive
2002/95/EC on the restriction of the use of certain hazardous
substances (RoHS) in electrical and electronic equipment.
The LPT
-1
1 transceiver includes an integral switching
power supply that requires minimal external components to
furnish +5VDC at up to 100mA.
This current is typically used
to power a Neuron Chip and application electronics, sensors,
actuators, and displays. The high current capability of the LPT-
1
1 transceiver eliminates the need for local power supplies at
each node, resulting in equipment and labor cost savings.
Using the LPT-11 transceiver can save thousands of
hours of development time compared with designing a custom
transceiver
. The transceiver is designed to comply with FCC
Part 15, Level B, and CISPR 22 Level B regulations, minimiz-
ing time consuming and expensive laboratory transceiver
t
Complete LONWORKS
®
free topology communication
transceiver and power supply in a miniature SIP
t
Receives both network data and power on a single
twisted wire pair
t
Provides unmatched electrical noise isolation
t
Polarity insensitive network wiring
t
78 kilobits per second network bit rate for distances
up to 500 meters (free topology) and up to 2200 meters
(doubly terminated bus topology)
t
Supports free topology star, bus, and loop wiring
t
Compatible with the FTT-10A Free Topology
T
ransceiver, as well as the FT 3120
®
/FT
3150
®
Smart
T
ransceivers
t
Supplies 5VDC @ 100mA maximum for node power
t
Meets the requirements of the LONMARK
®
TP/FT-10
channel type
Typical Wiring Topologies Supported by the LPT-11 Link Power Transceiver
Mixed
LPI-10
Star
LPI-10
Single Termination Bus/Line
L
PI-10
Loop
LPI-10
Double Termination Bus/Line
L
PI-10
T
ermination
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