Alpha Technologies EDSM - Manual (Page 10)

704-721-C0-004, Rev. D 10
Fig. 2-1, LED Arrangement
ALM The red ALM LED refl ects system level alarms. When a system
level alarm is active, the ALM LED will fl ash. A major alarm is
present when the LED is fl ashing faster than the READY LED. A
minor alarm is present when the LED is fl ashing slower than the
READY LED.
RDY The green RDY LED fl ashes once per second to indicate that the
EDSM software is running normally. Under normal conditions, this
LED is only turned off while alarm codes are being displayed.
DT The green DT LED indicates active communications between the
EDSM and the DT. It is an indication of receive activity of the serial
communications between the EDSM and DT.
COM The COM LED indicates active communications on the RS-485
Alpha Bus. The Alpha Bus is the internal communications link
between the EDSM and the power system. It is a combined
indication of both transmit and receive activity.
2.0 Connectors and Indicators
2.1 LED Indicators