Using Physical GPI to Select the Primary Input Source

Updated 3 months ago by Mark Manolio

Scope

How to use the rear panel GPI "Interface" connector to change the Primary Input Source.

Note: This also applies to the Omnia One

Description

Using external dry contact closures, you can use the rear panel "Interface" connector to change the Primary Input Source selection. 

Setup

Here is the GPI "Interface" connector pinout.

This is a DB9-F connector on the rear panel for remote control input, using contact closures or other logic-level systems.

Pin 1: +5VDC Out

Pin 2: Input Common +

Pin 3: Trigger input #1

Pin 4: Trigger input #2

Pin 5: Trigger input #3   

Pin 7,8,9: GND

For operation, a voltage must be applied to voltage input on pin 2. The +5V power output on Pin 1 may be used as the input voltage. If this is done, the trigger inputs may be tied to 5V or left floating for a "high" state, and tied to ground for a "low" state. In the below example Pins 1 & 2 are tied together.

Input Routing:

Trigger Inputs 1 & 2 select the primary input source. The secondary source must be set manually.

Input #1 acts independently to select either the analog input on a falling edge (grounding Pin 3)  or the AES input on the rising edge (un-grounding Pin 3):

Input #2 acts to select the LiveWire input on a falling edge (grounding Pin 4). On a rising edge (un-grounding Pin 4) the state of Input #1 is examined to select one of the other inputs: ("L" = grounded, "H" = un-grounded)

xLxx = LiveWire input

LHxx = Analog input

HHxx = AES input

If Inputs 1 and 2 have simultaneous transitions, Input 2 takes precedence. So LLxx and HLxx switch to LiveWire.

Input #3 is the manual failover trigger:

xxLx = trigger a manual failover. This will cause the secondary input to be selected and the failback logic to be activated.

xxHx = manually clear a failover. This will cause the primary input to be selected and normal failover logic to be activated.

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