User`s guide

LONWORKS LPT-10 Transceiver User’s Guide 1-1

Introduction

The LPT-10 Link Power Twisted Pair Transceiver provides a simple, cost

effective method of adding a network-powered L

ONWORKS

transceiver

to any Neuron

Chip-based machine controller, process controller, fire

and security device, or general purpose controller. The LPT-10

transceiver consists of a Single In-Line Package (SIP) containing a 78kbps

differential Manchester coded communication transceiver, a switching

power supply that extracts power from the twisted pair network, and

connections for the Neuron Chip Communications Port (CP) lines and

the twisted pair network. The LPT-10 transceiver eliminates the need to

use a local power supply for each node since node power is sent from a

central power supply over the same twisted wire pair that handles

network communications. Up to 128 nodes can be supported on a single

free topology network segment.

The LPT-10 transceiver supports free topology wiring, freeing the

system installer from the need to wire in a multidrop arrangement.

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 in excess of the system limits, then two or

more link power systems can be interconnected with an inexpensive,

physical layer repeater. The LPT-10 contains built-in circuitry to allow

two or more transceivers to be connected back-to-back to make a

repeater.