User`s manual

OpenTracker USB User’s Manual 2
Telemetry – The OpenTracker USB has on-board temperature and voltage
sensors, plus four analog 0-20v inputs and two digital input/output pins.
Temperature and voltage readings can be reported in status packets, and the
other readings can be reported in an APRS telemetry message.
Scripting – To automate a variety of tasks and increase the device’s feature set,
the OpenTracker USB includes a simple user-programmable script system.