Key Operational Parameters / Common Commands And Queries; Faults; Common Commands - Comtech EF Data LGAN Installation And Operation Manual

5.2

Key Operational Parameters / Common Commands and Queries

5.2.1

Faults

The M&C system monitors certain key functions for proper operation. Should any of these parameters exceed predetermined limits, the M&C
system will declare a fault. The conditions that trigger a fault are:
•
Any power supply outside its nominal value window
•
A fan running at less than 25% of maximum speed
•
Thermal Shutdown - A temperature fault is indicated if the unit is > +95°C (203°F) . This creates a summary fault and will cause
the unit to mute itself and switch to the back-up unit (if in a redundant system). However, the 10V supply to the FET transistors will
remain on until the unit reaches the thermal shutdown temperature of > 100°C (212°F). For protection reasons, the unit will shut
down the 10V supply to the power transistors at temperatures > 100°C (212°F).
5.2.2

Common Commands

A few of the most common commands and queries are listed below. Full details for each of these are listed at the end of this section.
•
RMS = Retrieve Maintenance Status. Displays voltages, fan speeds, Heatsink temperature, output power monitor reading, etc.
•
RCS = Retrieve Configuration Status. Displays current attenuation, mute, amplifier, online, etc. status.
•
RAS = Retrieve Alarm Status. Displays current alarm or fault status.
Serial Interface Operation 5–2
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MN-LGAN