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2007 RuggedCom Inc. All rights reserved Rev100
Figure 12: Conceptual recommended RS485 wiring diagram
3.1.5 Serial Port Transient Protection
RuggedCom does not recommend the use of copper cabling of any length for critical real-time
substation automation applications. However, transient suppression circuitry is present on all
copper ports to protect against damage from electrical transients and to ensure IEC 61850-3 and
IEEE 1613 Class 1 conformance. This means that during the transient event communications
errors or interruptions may occur but recovery is automatic. RuggedCom also does not recommend
to use these ports to interface to field devices across distances which could produce high levels of
ground potential rise, (i.e. greater than 2500V) during line to ground fault conditions.