English User Guide Page 19
pro.Bose.com Installation and Operating Guide
7. Connect GPIO Devices
Eight control inputs (GPI) and eight controls outputs (GPO) are available
and can be used to interface the ESP processor with external control
hardware. One open GPIO card slot is available for doubling the GPIO
capability (16/16).
General Purpose Inputs
General-purpose control input ports are used to connect external hardware such as potentiometers (to control levels or gains) and
switches (to invoke parameter sets). Using ControlSpace
®
Designer
™
software, functions can easily be assigned to these external
controls. In addition, Bose offers the CC-4 room controller which provides 4-source selection and volume control.
General Purpose Outputs
LEDs and relays can be connected to general-purpose control outputs to indicate state changes in the system, activated by parameter
sets and timer events. The following two examples showcase the two methods available for driving external devices.
Using Switches
Both toggle switches and pushbuttons can be used with
control inputs. Each input terminal is tied to an internal pull-up
resistor (5k ohm) so that external switches can be wired
directly from input to ground.
Using Potentiometers
10k ohm potentiometers can be connected and associated
with control gain blocks in a system design. Inputs are
compatible (through software) with linear taper potentiometers
wired for minimum resistance at the the full-counterclockwise
position.
Current Source Devices
Some devices such as high-efficiency LEDs can be powered
directly from control outputs. A maximum source current of
0.5 mA is available.
Source Limits: 5 VDC, 0.5 mA (max.)
Current Sink Devices
Devices that require more current than is available from a current-
source configuration can use control outputs to sink up to 10 mA
when used with external power supplies. Use proper precautions
when driving inductive loads.
Sink Limits: 10 mA (max.) External supplies must be ≤ 24 VDC.
Toggle
switch
Push
button
LED
AnodeCathode
Current
Limiting
Resistor
External
Supply
(24 VDC
Max.)
Relay
(Rated Current of
Coil <10
mA)
GPIO 1
DSP
10k potentiometer
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