Mono Vs. Stereo; Pinouts - Balanced Audio; Pinouts - Contact Closures - Comrex ACCESS MultiRack Product Manual

mono Vs. stereo

Regardless of whether audio input is configured as analog, AES3, or AES67, MultiRack uses its left channel input
only for encoder Mono Modes. The right channel is omitted. Output audio is available at both the left and right
outputs in decoder Mono Modes.
pInouts - bAlAnced AudIo (InstAnce #1 only)
ACCESS audio connections are balanced professional level inputs and outputs:
Pin 1 Ground
Pin 2 Audio +
Pin 3 Audio –
XLR Pinouts
pInouts - contAct closures (InstAnce #1 only)
Contact Closures are available via the male 9-pin GPIO port on the back of the MultiRack. Inputs are triggered by
shorting the respective input to Pin 5. Outputs consist of an open collector circuit which, when inactive, will offer a
high-impedance path to Pin 5 and, when active, will offer a low impedance path to Pin 5. These outputs are capable
of sinking up to 200 mA at a voltage up to 12 V. Do not switch AC mains power using these contacts.
Contact Closure Pinouts
Pin 1 Input #1
Pin 2 Input #2
Pin 3 Input #3
Pin 4 Input #4
Pin 5 Ground
Pin 6 Output #1
Pin 7 Output #2
Pin 8 Output #3
Pin 9 Output #4
pInouts - contAct closures (InstAnces #2-5)
Contact closures for these codec instances are available by attaching a USB-to-GPIO converter device to one of the
available USB ports on the rear panel (A USB hub may be required if ports are full). The supported device is the
Advantech USB-4750-BE (sold by many online retailers). The pinouts of this device are:
Pin 1 Ground
Pin 2 Data +
Pin 3 Data –
AES3 Pinouts
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