Connect Gpio Devices; General Purpose Inputs; General Purpose Outputs - Bose ControlSpace ESP-00 Series II Installation Manual

Installation 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
controls. In addition, Bose offers the CC-4 room controller which provides 4-source selection and volume control.
Using Switches
Both toggle switches and pushbuttons can be used
with control inputs. Each input terminal is tied to
an internal 5k ohm pull-up resistor so that external
switches can be wired directly from input to ground.
Figure 10. Example GPI connections for switches
Toggle switch Push button

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.
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.)
Figure 12. Example GPI connections for switches
LED
Cathode Anode
18
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 software) with linear
taper potentiometers wired for minimum resistance at the full counterclockwise
position.
Figure 11. Example GPI connections for a potentiometer
10k
potentiometer
Current Sink Devices
Devices requiring more current than is available from a current source configu-
ration 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.
Figure 13. Example GPI connections for a potentiometer
Current
Limiting
Resistor
External
Supply
(24 VDC
Max.)
Figure 9. GPIO connector location
DSP GPIO 1
Relay
(Rated Current
of Coil <10 mA)
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