Add a Loss of Signal (LOS) Indicator to Your RS-485 or RS-422 Transceiver Application Note 1593 Author: Jeff Lies Add a Loss of Signal (LOS) Indicator to Your RS-485 or RS-422 Transceiver Introduction Rx Failsafe A desirable feature on any network may be a Loss of Signal In RS-485/RS-422 terminology, “failsafe” is used to indicate (LOS) indicator. Such an indicator alerts a monitoring controller Rx functionality that drives the Rx output to a known state that a potentially serious network error has occurred, thereby ……