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Parts of the Surge Suppression Package

RTMS Sx-300 User Guide

©2014 Image Sensing Systems Inc.

B-3

The negative terminal of the low voltage side of the power supply, 
battery, or solar controller must be connected to the earth ground in 
order to provide a reference point for the Autoscope RTMS Sx-300 
built-in surge protection.

Communication lines to the Autoscope RTMS Sx-300 sensor are sensitive lines that 
must be protected from external influences to prevent damage to the communication 
interface on the sensor and ensure uncorrupted data flow to and from the sensor. Each 
communication line should be protected by a device that will shunt excess current on 
the line to earth ground rather than sending that current through the Autoscope RTMS 
Sx-300 sensor and causing damage to the device. Care must be taken when providing 
protection on communication lines to ensure the device chosen will not add excess 
capacitance or inductance that could cause disruptions to the integrity of the data. 

 and 

 show the protections provided by the manufacturers 

approved surge suppression packages on the communications interfaces for the 
Autoscope RTMS Sx-300 sensor.

TxD

RxD

SGND

RTS

CTS

Cable’s shield (drain wire)

Serial Transient 
Suppression