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AS-Interface is a floating communication network and neither one of the two leads [AS-Interface + or AS-Interface -] is connected to ground.  If this happens, the network has a ground fault, reducing the ability of the installation to deal with electromagnetic noise. Related to this is an important feature of our AS-Interface gateways giving them the ability to track communication errors. --Make sure the (+) and (-) terminals of the power supply are not grounded --Don't introduce ground faults along the network (pinched cables for instance) --Always use the built-in error counter feature to gauge the quality of the installation --Don’t forget to reset those counters to get a reliable relative error measure over time Visit our website to download the Troubleshooting Guide.