User`s guide

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The LPT-10 transceiver includes an integral switching power supply
that can furnish +5VDC at up to 100mA. The LPT-10 transceiver
derives its power directly from the switching power supply, providing
up to 100mA of current for a Neuron Chip, application electronics,
sensors, actuators, and displays. The high current capability of the LPT-
10 transceiver eliminates the need for local power supplies at each
node, resulting in equipment and labor cost savings.
The LPT-10 transceiver includes a comprehensive power management
system to reduce node power consumption. The internal switching
power supply draws power from the twisted pair network and uses a
sophisticated, efficient design that provides only as much current as is
needed at any given time by the node. A transceiver sleep feature
permits the node's Neuron Chip to turn off the transceiver to conserve
power. Finally, an adjustable wake-up timer in the LPT-10 transceiver
can periodically wake-up a Neuron Chip in sleep mode to sample
inputs/outputs and communicate with the network. At all other times
the Neuron Chip can be asleep, dramatically reducing node power
consumption.
The LPT-10 transceiver is compatible with Echelon's FTT-10 Free
Topology Transceiver, and these transceivers can communicate with
each other on a single twisted pair cable. This capability provides an
inexpensive means of interfacing to nodes whose current and/or
voltage requirements would otherwise exceed the capacity of the link
power segment. When equipped with an FTT-10 transceiver, these
nodes can be operated from a local power supply without the need for
additional electrical isolation from the link power network.
Using the LPT-10 transceiver can save literally thousands of hours of
development time compared with a custom-designed transceiver. The
LPT-10 transceiver is designed to comply with FCC, VDE and IEC-801
EMC requirements, minimizing time consuming and expensive
laboratory transceiver testing. As a UL-Recognized component, the LPT-
10 transceiver can be integrated into a product with minimal additional
safety testing of the LPT-10 transceiver module. The LPT-10 transceiver
also meets L
ONMARK™ interoperability standards.