Parameters¶

Parameter PVs represent a value that is provided by a connected Yamcs server, usually from packet telemetry.

The PV Name for parameters is the fully qualified name as identified in the Yamcs Mission Database.

Example PV Names:

• /YSS/SIMULATOR/BatteryVoltage1

• /YSS/SIMULATOR/BatteryTemperature1

In these examples YSS is the name of the root space system. SIMULATOR is the name of the space system directly below, which defines both measurements BatteryVoltage1 and BatteryTemperature1.

LOLO/LO/HI/HIHI Markers

Several widgets support the display of low/high warning and alarm markers. If those widgets have the property Limits from PV enabled, the marker positions are mapped from Yamcs severity levels:

• WATCH, WARNING, DISTRESS → LO/HI

• CRITICAL, SEVERE → LOLO/HIHI

Minimum/Maximum

Several widgets display the current PV value on a scale. If those widgets have the property Limits from PV enabled:

• The lower bound of the scale matches the most-severe lower bound of the parameter. If Yamcs does not specify any lower bound, the widget reverts to the configured Minimum property.

• The upper bound of the scale matches the most-severe upper bound of the parameter. If Yamcs does not specify any upper bound, the widget reverts to the configured Maximum property.

  Units

  Some widgets have the property Units from PV. If enabled, Yamcs Studio will compose a unit string based on information provided by Yamcs.