Tendzone TYCHO T 1212/CA - Manual (Page 18)

When all the output channels of the audio matrix are muted, PIN-11 (i.e. RO 8) outputs 0, and remains the same before
any channel is not muted, at which time PIN-11 outputs 1.
Example 2: OC Output Drives a Relay (RO 5~8)
The relay can be used to control alarm devices or other device
PIN-25 outputs 12 V voltage and PIN 8-11 (i.e. RO 5 ~ 8) control the relay according to changes of the matrix state.
The scene type is set at Scene Display for RO 8 on the PC interface as follows: