User`s manual

Tracker3 User’s Manual 7
Telemetry – All Tracker3 models include an integrated temperature sensor. The
OT3m and T3-301 can measure and report their supply voltage, and the OT3m
includes four analog 0-20v inputs and one digital telemetry input. The T3-Mini
has a total of 13 digital input/output pins and four analog inputs. 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 Tracker3 includes a simple user-programmable script system.
5. Hardware Description – OT3m
The Tracker3 model OT3m features a heavy-duty steel enclosure and measures
approximately 4.2” by 3.2” by 1”. The circuit is built with surface mount
technology and includes over-voltage and over-current protection, as well as RFI
filtering on external connections.
5.1. Front Panel
The front panel has two bi-color indicator LEDs, marked ACT (activity) and
TX/RX (transmit/receive). The removable 10-pin terminal block is an accessory
port that provides a Dallas 1-wire data bus, 5 volt power, four 0 to 20v analog