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5.5 GPIO Setup and Connection
UXA4401 amplifiers provide a GPIO socket that enables
remote control of volume, standby, mute and trigger functions.
The GPIO connector pin functions are described in the GPIO
Settings menu illustrated in Diagram 4v. The connection of
GPIO based remote volume control and standby/mute are
illustrated in Diagram 4w and Diagram 4y respectively.
Note: The GPIO connector must not be used for any unintended
purpose. Amplifier damage may result from incorrect use of
GPIO.
Note: Shielded cable must be used when connecting standby
switches and potentiometers via GPIO.
Note: GPIO Pin 8 has a low output impedance and is able to
supply a maximum current of 10mA.
Note: GPIO Pin 1 and Pin 3 both offer ground connections:
Pin 1 is connected directly to the amplifier chassis.
Pin 3 is connected to the chassis via a 220 Ohm resistor.
The 'soft ground' connection of Pin 3 is potentially useful for
managing ground loops that may cause audible hum.
Diagram 4w
Potentiometer connections for remote vol-
ume control via GPIO.
Note: Diagram 6c illustrates
use of the GPIO connector.
Connect Wiper to
Pin 4, 5, 6 or 7.
Configuration
Potentiometer
(>10kΩ)
Diagram 4y
Connections for remote
standby/mute switch via GPIO.
Note: Diagram 6c illustrates
use of the GPIO connector.
Diagram 4v
GPIO Settings Menu
Switch open or closed
toggles Standby or Mute
depending on options
selected in the GPIO
Settings Menu
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