the OI reference guide tells you which pins you are allowed to take power from on the 4 ports (joystick ports) and how much power you can draw from them
if you want to have something else powered at your drivers station, you have to run it off your own batteries.
from page 7 of the operators interface reference guide:
Quote:
[1] The DISABLE dipswitch on the Operator Interface
[2] LED drivers provide 5V at 10mA
[3] +5V Aux is to be used for potentiometers in Joysticks and custom I/O boxes.
[4] Do not use +5V Aux for lamps or LEDs.
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