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DATA-LINC GROUPp
LCM100 User’s Guide
LCM100
Line Carrier Modem
Introduction
In the line carrier system, the hot line supplies current to connected loads and is also used as a
carrier for data communication between modules. The Data-Linc LCM100 can communicate over
the same line in a 240 volt single phase system or on any individual phase of a three-phase
system.
Note: It will be necessary to have a signal coupler installed to ensure communications over
different lines of the 240 volt, single phases system.
In the three-phase power environment, communication will occur freely if both devices are
connected on the same phase, but cross-phase communication will require line conditioning by
installation of a signal coupler between phases. As shown in Figure 1 below, two signal couplers
are sufficient for all cross-plane combinations in a three-phase system. Installation of a signal
coupler at the power distribution panel is fully described under the line conditioning section of
this manual.
Hot
120V signal coupler Load
meter &
circuit neutral 220V
breaker
120V Load
Hot
Figure 1: Connecting a Signal Coupler, Single Phase System
The green wire is reference (earth) ground. It serves also as chassis ground and reduces
equipment susceptibility to RF current, static discharge and interference from fluorescent lamps.
The LCM100 system is designed to operate with a reference ground located at the power
distribution panel. Reference ground is usually connected to the copy ground bus or to the
distribution panel frame.
When the power cord is connected to a three-wire AC power outlet, the bottom round connector
serves to ground the chassis, protecting against shock hazard, susceptibility to electro-magnetic
interference and possible spurious emissions.
PN 161-09998-001A
2