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Appendix E – Ground Loop Phenomenon
What is Ground Loop?
Ground loop Phenomenon occurs when two (or more) pieces of equipment are connected together with a
common ground and a different ground potential exists at each location. This current can cause the
connected equipment to experience noise that in turn causes data transmission errors. In the extreme this
ground current can cause equipment malfunction or even destruction.
Cabling Recommendations
When connecting the 7802ec in a RS-485 network, care should be taken that both ends of the network are
not isolated from ground (see below). This "floating" ground condition could cause the capacitive or
inductive coupling of voltages that will cause a break down in the DC to DC converter circuit or in the opto-
isolator circuit. This condition will cause data errors and possibly destruction of the receiver circuit.
© Sealevel Systems, Inc.
7802ec &7802ecS Manual | SL9680 11/2022
A
Isolated
Adapter
Isolation
Barrier
B
DATA+
Non
DATA-
Isolated
Ground
Adapter
25
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