Midas PRO1 Owner's Manual page 261

Rear panel connectors
A 100Mb/s Ethernet control port for connection of a Neutrik etherCON Ethernet
connector.
DVI connector.
USB type A connector.
Bi-directional digital audio EtherCon® ports.
The talk back input connector accepts a male XLR plug.
PRO1 Live Audio System
Operator Manual
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Ground. 2. Hot. 3. Cold.