Argent Data Systems OpenTracker USB Manuel d'utilisateur télécharger pdf (Page 35)

OpenTracker USB User’s Manual 33

13. Telemetry

The OpenTracker USB has the ability to send telemetry information from its

onboard temperature and voltage sensors, and header CN4 provides four 0 to 20

volt analog inputs and one general-purpose digital input/output pin.

When telemetry reporting is enabled, the tracker transmits standard APRS

telemetry reports in the following format:

T#sss,aaa,bbb,ccc,ddd,eee,76543210

The ‘sss’ field is a sequence number that increments with each report. Fields

‘aaa’ through ‘eee’ encode five channels of analog readings from 0 to 255, and

fields 7 through 0 are binary bits, either 0 or 1, representing digital inputs.

The ‘aaa’ field represents the tracker’s supply voltage, and fields ‘bbb’ through

‘eee’ correspond to inputs A1 through A4 respectively. All voltages are reported

in 1/10 volt units.

Digital bit 1 reflects the state of the tracker’s GPIO pin (CN4 pin 7), and bit 0

indicates the configuration profile currently in use.

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Argent Data Systems OpenTracker USB Manuel d'utilisateur Page 35