Digigram ES8AES Manuel D’Utilisation

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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. 

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 

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).