7
Mic/Line inputs
The ESP-88 (base model) includes two "4 x 4"
Mic/Line cards. Each of these cards occupy two slots.
The input connectors and the input LEDs appear in the
first slot, the output LEDs and connectors (orange)
appear in the second slot. A microphone or line level
audio source can be connected to the Mic/Line inputs
using one of the following cable types.
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.
Likewise, 10k potentiometers (linear) can be con-
nected 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
connections 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 per output is available and
therefore care must be taken when selecting compo-
nents. 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 con-
nected directly. Most mechanical relays require more
than 10mA drive current and are not suitable for direct
connection. Alternatively, an external power supply
and transistors can be used to drive higher current
LEDs or relays.
General Purpose Inputs/Outputs
Rear Panel Controls and Connections
The ESP-88 (base model) includes one GPIO card in
slot 1 providing eight control inputs and eight control
outputs. A second card can be added to GPIO slot 2.
Inputs include a 5k ohm pull-up resistor allowing
SPST switches to be wired from input to ground.
Potentiometers can be wired in series from the control
input to ground.
(11 pages)
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