Appendix A: Gpio Connectors; General Purpose Inputs (Gpis); Gpi #1; Gpi #3 & Gpi #4 - Digigram Ether Sound ES881 Manuel Utilisateur

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APPENDIX A: GPIO CONNECTORS

ES881, ES1241, and ES16161 feature four optocoupled GPIs and four relay GPOs. GPIs
allow sending commands to the EtherSound configuration software, GPOs can be used by
the EtherSound configuration software for remote control of external devices.
The GPIO pins are labeled 1 through 8 on the rear panel as illustrated.

General Purpose Inputs (GPIs)

Schematic diagrams show the particular design for each GPI. The GPI status can be either "1" or "0". It is read
"0" as soon as the system connected to the GPI creates the current labeled "i" on the scheme. Otherwise it is
read "1". Different GPI designs allow for multiple ways to establish this current, thus offering utmost flexibility
in system configuration to best meet your needs.
Note: Pin 2 delivering +5 V electric potential and pin 4 being connected to ground may also be used in the
configuration of other GPIs.

GPI #1

GPI #1
GPI #3 & GPI #4

GPI optocoupler specifications

12
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GPI #1 uses pins 1 & 2
Pin 2 delivers +5 V electric potential. This pin may serve as a source to create a
current flow for GPI #3 and GPI #4.
Switching the GPI state to 0:
Pin 1 is to be connected to ground to establish the "i" current, typically by
connecting it to pin 4.
GPI #3 uses pins 1 & 4
Switching the GPI state to 0:
Pin 3 is to be connected to ground to establish the "i" current, typically by
connecting it to pin 4.
GPI #3 uses pins 5 & 6, GPI #4 uses pins 7 & 8.
Switching the GPI state to 0:
A current flow is to be established from pin 6 to pin 5 (GPI #3) or from pin 8 to
pin 7 (GPI #4).