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Hardware Installation
7. Connecting GPIO Devices
You can use the five control inputs (GPI) and five controls outputs (GPO) to interface the processor with
external control hardware.
General Purpose Inputs
You can connect general-purpose control inputs to external hardware such as switches (to invoke parameter
sets) or potentiometers (to control levels or gains). Using ControlSpace Designer software, you can easily
assign functions to these external controls. In addition, Bose Professional offers several GPI-compatible
interfaces (see Available Accessories on page 11 for a complete list).
Using Switches
You can use toggle switches or pushbuttons with
control inputs. Each input terminal is tied to an
internal two-kiloohm pull-up resistor so that external
switches can be wired directly from input to ground.
Example: GPI connections for switches
General Purpose Outputs
Current Source Devices
The control outputs can power some devices such as
LEDs and low-current relays directly. The maximum
source current is 10 milliamps.
Source Limits: 8 VDC, 10 mA (maximum).
Example: GPO connections for a current source
20 • English
Using Potentiometers
You can use 10-kiloohm potentiometers with control
gain blocks in a system design. Inputs are compatible
(through ControlSpace Designer software) with
linear taper potentiometers wired for minimum
resistance at the full-clockwise position or at the full-
counterclockwise position.
Example: GPI connections for a 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 100 milliamps when used with
external power supplies. Use proper precautions
when driving inductive loads.
Sink Limits: 100 mA (maximum). External supplies
must be ≤24 VDC.
Example: GPO connections for a current sink
ControlSpace ESP-880A/880AD/1240A/1240AD • Installation Guide
BoseProfessional.com
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