Bose ControlSpace ESP-88 Installation Guide download pdf (Page 9)

Audio connections

A microphone or line level audio source can be con-

nectedtotheMic/Lineinputsusingoneofthefollowing

wiring methods.

General Purpose Inputs/Outputs (GPIO)

cards

TwoGPIOcardslotsprovideupto16controlinputs

and16controloutputs.TheGPIOinputsareusedto

accept hardware-based control signals from switches,

relays or potentiometers.

Inputs

Switches and potentiometers can be connected to

the control inputs to control various functions in the

system.Forexample,simpleON/OFFswitchescanbe

connected and then programmed to invoke presets,

select scenes, or invoke a snapshot of a control. Like-

wise, 10k potentiometers (linear) can be connected to

control gains in the system.

When used for gain control, the control input expects

tosee0ohmsforfullgainand10kohmsfor"OFF"or

muted. This is to prevent unterminated or loose con-

nections from inadvertantly causing full-gain audio,

since the port features an internal pull-up resistor.

Therefore, wire the potentiometer such that the fully

rotated clockwise position (full gain from the user's

perpective) is 0 ohms and the fully counterclockwise

position is 10k ohms.

Outputs

LEDs and relays can be connected to general purpose

outputs to indicate state changes in the system (e.g.

preset or scene changes).

Amaximumof10mA(sink;0.5mAsource)peroutput

is available and therefore care must be taken when

selecting components. Select LEDs that are “High

Efﬁciency” and require only 10mA forward current. For

relays, only those rated with an LED forward current

of 10mA or less, such as some solid state relays, can

be connected directly. Most mechanical relays require

more than 10mA drive current and are not suitable for

direct connection. Alternatively, an external power sup-

ply and transistors can be used to drive higher current

LEDs or relays.

Modularity and Expansion

Inputs include a 5k ohm pull-up resistor allowing SPST

switches to be wired from input to ground. Potentiom-

eters can be wired in series from the control input to

ground.

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Bose ControlSpace ESP-88 Installation Guide Page 9

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