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AX2500/2850 Motor Controller User’s Manual 77
Powering the Radio from the controller
Important Warning
Do not connect a battery to the radio when in this mode. The battery voltage will
flow directly into the controller and cause permanent damage if its voltage is higher
than 5.5V.
Notice that in this configuration, the controller’s +5V power and ground are connected to
the floating (opto-isolated) R/C power inputs so that now the radio and the controller are no
longer optically isolated.
8
9
15
Pin 1
Channel 1
Wire loop bringing power from
controller to RC radio and
to optical isolators
Channel 2
3: Channel 1 Command Pulses
4: Channel 2 Command Pulses
6: Radio battery (-) Ground
7: Radio battery (+)
8: Channel 3 Command Pulses
Channel 3
FIGURE 48. Wiring for powering R/C radio from controller
Controller
Power
R/C Radio Power
Opto-
Isolators
R/C Radio
MCU
R/C Channel 1
R/C Channel 2
R/C Radio Ground
Controller
Ground
R/C Channel 3
14
3
7
8
6
5-13
4
FIGURE 49. R/C Radio powered by controller electrical diagram