Appendix A: Gpio Description; General Purpose Inputs (Gpis); Gpi #2; Gpi #3 & Gpi #4 - Digigram EtherSound ES8in Manuel Utilisateur

D i g i g

APPENDIX A: GPIO DESCRIPTION

ES8in/ES8mic and ES8out 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 be used in the
configuration of the GPIs, e.g. pin 2 may serve as a source to create a current flow for GPI #3 and
GPI #4.
GPI #1

GPI #2

GPI #3 & GPI #4
14
r a m
GPI #1 uses pins 1 & 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 #2 uses pins 3 & 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).