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DATA-LINC GROUPp
LCM100 User’s Guide
Appendix B
Line Conditioning
In some industrial installations, power lines must be conditioned to prevent the FSK signal from
being shunted by distributed capacitance possibly associated with other loads connected to the
line. Motors and transformers, for example, may have very high distributed capacitance.
Adequate communication in such circumstances may require: 1) installation of signal couplers at
the power distribution panel to provide a low impedance path between different hot lines; 2)
isolation of noisy equipment or equipment that presents a low impedance to high frequency
signals, such as some power line filters commonly used with computer equipment.
Signal Couplers
One signal coupler is sufficient for all cross-phase communications in a signal phase system.
See Figure 4 below:
DTE DCE
FSK
A Phase
Signal LCM100-1 RS-232C
Coupler
B Phase
Signal
Coupler
C Phase FSK
LCM100-2 RS-232C
Neutral
Figure 4: Signal Coupler in Three Phase Systems
PN 161-09998-001A
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