This setup information applies to the Calrec® Alpha, Omega, and Sigma Digital Audio Mixing System.

Cable Connections

The Alpha and Sigma connect to the switcher over an RS-422 serial connection to a DB9 port on the switcher. The Omega uses an RS-232 serial connection.

Note: If the cable connection between the switcher and the Omega is longer than 50 feet, an RS-232 to RS-422 converter is required at the Omega.
Table 1. Switcher to Alpha/Sigma Cable Connections
Acuity (Remote Port) Alpha / Sigma (RS-422 Port)
2 (Rx-) 5 (Tx-)
3 (Tx+) 8 (Rx+)
7 (Rx+) 4 (Tx+)
8 (Tx-) 9 (Rx-)
Table 2. Switcher to Omega Cable Connections
Acuity (Remote Port) Omega (RS-232 Port)
2 (Tx) 3 (Rx)
3 (Rx) 2 (Tx)
5 (GND) 5 (GND)

Switcher Setup

The switcher must be set up to communicate with the audio mixer using either serial or ethernet protocols, as well as associate the audio channels on the mixer with video sources coming into the switcher.

To Set Up Communications

  1. Press HOME > Setup > Installation > Com Setup
  2. Press Type and use the Com Port knob to select the remote port that you want to set up for the device.
  3. Use the Device knob to select Audio Mixer.
  4. Press Select Device and use the Device knob to select RAP.
  5. Press Com Type and use the Type knob to select the transmission standard for your device.
    • Alpha and Sigma — select RS-422.
    • Omega — select RS-232.
  6. Press Com Settings and use the Baud and Parity knobs to select 115200 (Baud) and ODD (Parity).
  7. Press Extra Options and use the Option and Value knobs to set the device parameters.
    Option Value
    TargetMachine Calrec
    Ctrl Master M1 (default)
    Multiplier 2 (default)
  8. Press HOME > Confirm.

To Set Up a Video Input

Tip: Refer to your switcher Setup manual for information on setting up audio groups.
  1. Press HOME > Setup > Installation > Source Configuration > Audio.
  2. Use the Input knob to select the input source that you want to assign an audio channel or group to.
  3. Use the Audio X knob to select the audio channel, or group, that you want to assign to the selected source. You can assign up to two channels or groups.
  4. Press HOME > Confirm.