Hardware Connections
Figure 11: Phones output at 19" rack
9.2 Digital Inputs/Outputs
The Oxygen 4 Digital holds 7 digital inputs and outputs. At the rear side of the 19” rack you will find
digital I/O 1-6 and at the front side is Digital I/O 7 located. The digital inputs at the rear side can
receive either Coax (SPDIF) or XLR (AES3) digital audio.
Figure 12: Digital Input/Output at rear side
Pin 1
RX IN +
Pin 6
RX IN -
Pin 2
GND
Pin 7
TX OUT +
Pin 3
TX OUT -
Pin 8
GND
Pin 4
GPO A
Pin 9
GPO B
Pin 5
Not Connected
Table 6: Pinning Dig I/0 1..6
GPO-A and GPO-B make connection if the GPO is activated!
Maximum current:
200 mA
Maximum resistance when connection made:
12 Ohm
Maximum Voltage:
24 V
Below you see the layout of the front side digital input. You can choose which type of digital audio
connection you want to use as input: Coax or Optical. The switch in between controls this selection.
The LED's will show which type is used and if a valid digital audio signal is received (NO LOCK led is
off when signal is valid).
Figure 13: Digital Input/Output at Front side
Oxygen 4 Digital - from Axel Technology Phone +39 051736555, [email protected] Page 23
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