Pololu TReX Jr User Manual

Page 15

1. All required channels must have a valid signal. This only applies when the TReX Jr is in RC mode since
it’s not possible to have an invalid analog signal. Required channels are determined by the “required channels”
configuration parameter. Only channel one is required by default.

2. All motor channels must be close to their neutral values (i.e. they must not be instructing the motors to
move very quickly). Channel 5 must be disabling serial override. The TReX Jr will not allow you to start with
serial controlling the motors if you’re in RC or analog mode.

If you have floating channels while running in analog mode, it may be impossible for you to satisfy the safe-start
conditions. Bullet point #2 in the analog section (Section 4.d) provides several ways to fix this problem.

Once you have satisfied the safe-start conditions, the green status LED should stop flashing and turn solidly on. This
indicates that the channel inputs are now in control of the motors.

Pololu TReX Jr User's Guide

4. RC/Analog in Detail

Page 15 of 23