Returns the value of a source.
The list of fixed sources:
OpenTX Version
In OpenTX 2.1.x the telemetry sources no longer have a predefined name. To get a telemetry value simply use it's sensor name. For example:
  • Altitude sensor has a name "Alt"
  • to get the current altitude use the source "Alt"
  • to get the minimum altitude use the source "Alt-", to get the maximum use "Alt+"
@status current Introduced in 2.0.0, changed in 2.1.0, Cels+ and Cels- added in 2.1.9


  • source can be an identifier (number) (which was obtained by the getFieldInfo())
    or a name (string) of the source.

Return value

  • value current source value (number). Zero is returned for:
    • non-existing sources
    • for all telemetry source when the telemetry stream is not received
    • far all non allowed sensors while FAI MODE is active
  • table GPS position is returned in a table:
    • lat (number) latitude, positive is North
    • lon (number) longitude, positive is East
    • pilot-lat (number) pilot latitude, positive is North
    • pilot-lon (number) pilot longitude, positive is East
  • table GPS date/time, see getDateTime()
  • table Cells are returned in a table (except where no cells were detected in which case the returned value is 0):
    • table has one item for each detected cell:
    • key (number) cell number (1 to number of cells)
    • value (number) current cell voltage


Getting a value by its numerical identifier is faster then by its name. While Cels sensor returns current values of all cells in a table, a Cels+ or Cels- will return a single value - the maximum or minimum Cels value.
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