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Installation Guide
7. Connect GPIO devices
Five control inputs (GPI) and five controls outputs (GPO) are available
and can be used to interface the ESP processor with external control
hardware.
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
controls. In addition, Bose offers three GPI-compatible interfaces, the CC-4 room controller, the Volume Control with A/B switch user
interface, and the Volume Control user interface.
Using Switches
Both toggle switches and pushbuttons can be used
with control inputs. Each input terminal is tied to an
internal pull-up resistor (2k ohm) so that external
switches can be wired directly from input to ground.
Figure 12. Example GPI connections for switches
Toggle
switch
General Purpose Outputs
Current Source Devices
Some devices such as LEDs and low-current relays
can be powered directly from control outputs. A
maximum source current of 10 mA is available.
Source Limits: 8 VDC, 10 mA (max.).
Figure 14. Example GPO connections for a current source
LED
Anode
Cathode
18
Push
button
Figure 11. GPIO connector location
Designer
software, functions can easily be assigned to these external
®
™
Using Potentiometers
10k ohm potentiometers can be connected and associated with control gain
blocks in a system design. Inputs are compatible (through ControlSpace
Designer software) with linear taper potentiometers wired for minimum resis-
tance at the full-clockwise position or at the full-counterclockwise position.
Figure 13. Example GPI connections for a potentiometer
10k potentiometer
Current Sink Devices
Devices that require more current than is available from a current-source
configuration can use control outputs to sink up to 100mA when used with
external power supplies. Use proper precautions when driving inductive loads.
Sink Limits: 100 mA (max.). External supplies must be ≤24 VDC.
Figure 15. Example GPO connections for a current sink
Relay
(Rated Current of Coil <100
Current
Limiting
Resistor
mA
External
Supply
(24 VDC Max.)
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