Pro Tools | HD I/O Guide14
Connecting Pro Tools | HD I/O to Pro Tools | HDX Cards
Each HDX card supports up to 64 channels of audio input and output. To get a full 64 channels of I/O, you
can connect up to four 16-channel HD I/O to an HDX card. Two of the interfaces connect directly to Dig-
iLink Mini Ports 1 and 2, and the other two HD I/O connect to the Expansion ports on first two HD I/O.
To connect HD I/O to an HDX card:
Connect the HD I/O Primary Port to DigiLink Mini Port 1 on the HDX card using a DigiLink Mini ca-
ble.
To connect additional HD I/O audio interfaces:
1
After connecting the primary audio interface,
connect additional HD I/O (or other compatible
audio interfaces) by doing one of the following:
• Connect the Primary Port of the secondary in-
terface to the Expansion Port of the primary
interface with a DigiLink Mini cable.
• Connect the Primary Port of the secondary in-
terface to DigiLink Mini Port 2 on the HDX
card.
2
Repeat the preceding with additional HDX
cards.
3
Make the necessary Loop Sync connections
(see “Connecting Loop Sync” on page 14).
Connecting Loop Sync
If you are using two or more HD audio interfaces
or a SYNC peripheral, Loop Sync must be con-
nected to maintain proper clock synchronization
among the devices. For an example of connecting
multiple Avid HD audio interfaces, see Figure 2 on
page 15. For examples that include a SYNC pe-
ripheral, see the SYNC HD Guide.
To make Loop Sync connections:
1
Connect the Loop Sync Out of each interface to
the Loop Sync In of the next interface with a
BNC cable.
2
Connect the Loop Sync Out of the last interface
to the Loop Sync In of the primary interface or
SYNC peripheral with a BNC cable.
Figure 1. HD I/O connected to the DigiLink Mini Port 1 on an HDX card
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