Revision C • 1/04
HARRIS CORPORATION
2-10
2 Installation
di
ital
If a match box is not available, connect an un-
balanced device to a BMX
digital
input using the
following illustration.
When an unbalanced device must be connected
to a BMX
digital
balanced analog output, and an
IHF-PRO match box is not available, do not tie
the low (-) and shield pins together to “unbalance”
the signal. The low output pin must always be left
“floating” when unbalancing a BMX
digital
out-
put, as shown in the following illustration.
S/PDIF Signals
Digital devices with only an S/PDIF digital out-
put can connect to a BMX
digital
input, but only
when a 249 ohm resistor is used to load the 75
ohm S/PDIF cable. Install the resistor at the AMP
MOD IV housing per the illustration on the next
page.
Connecting an Unbalanced Device
to a BMXdigital Analog Input
Console
Balanced
Input
From the
Unbalanced
Device
R
L
Shields
3
2
1
6
5
4
Console
Balanced
Output
3
2
1
6
5
4
To the
Unbalanced
Device
R
L
Shields
Connecting an Unbalanced Device
to a BMXdigital Analog Output
(Nominal Output is -2 dBu)
(Make no connections to pins 2 & 5)
Digital Connections
Digital inputs and outputs are wired like the
Microphone Input shown above.
The Universal Input, RLS and Telco/Codec mod-
ules have digital inputs. The three-pin digital in-
puts accept AES-3 (AES/EBU) compatible signals,
and as mentioned in the Unbalanced Connections
section that follows, can also accept
S/PDIF signals in most cases.
Each Output module has multiple digital out-
puts. Each outputs an AES-3 compatible signal.
Note: The digital outputs cannot connect di-
rectly to an S/PDIF input. A signal translation
interface is required.
UNBALANCED CONNECTIONS
Although all analog inputs and outputs are
active and balanced, unbalanced consumer or
“semipro” equipment can be connected to the con-
sole. For best results, connect an unbalanced de-
vice through an IHF-PRO match box and keep
the unbalanced cable lengths as short as possible.
Microphone Input — 3-Pin Connector
Pin Signal Description
1 Shield (connects directly to the chassis)
2 Low (- input)
3 High (+ input)
AES/EBU Digital Inputs and
External Clock Reference Input
Pin Signal Description
1 Shield (connects directly to the chassis)
2 Low (- input)
3 High (+ input)
AES/EBU Digital Outputs
Pin Signal Description
1 Shield for AES/EBU signal
2 Low (- output)
3 High (+ output)
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