Scope of Functionality
DV64440.03 Issue 09 November 2019 ACU6100 17
Signal Tones
• Monitoring of up to 10 signal tones. 8 tones can be activated by discrete control lines from
external (aural alert tones).
Built-In Tests
• The ACU61 device has different built-in tests with optical indication of the test results.
• The tests monitor the system equipment and some internal circuits.
o PBIT: A system self-test starts after power-on.
o CBIT: A background test routine runs continuously during normal operation.
o IBIT: An additional test can be manually started.
Emergency Operation (Back-Up Operation)
• The emergency operation (back-up operation) can be started manually through the
selection switch for the back-up function on the ACU61.
• If there is total power failure, the headsets of pilot and copilot are automatically connected
to:
o Headset 1 (normally the pilot) is connected to TX1 and FIX1.
o Headset 2 (copilot) to TX2 and FIX2.
• The selection switch for the back-up function is not connected through the interface it must
be hardwired.
Slave Operation
• If there is a total loss of pilots or copilots ACU61 (ACU1, ACU2), the device can be
connected in parallel to the remaining ACU61 through the slaved mode.
• The selection switch for the SLAVE function is not connected through the interface it must
be hardwired.
Interface
• Control data are transferred through a redundant CANbus interface.
Special Functions
• Audio Control Units are factory configurable to different operation profiles, e.g. disabling
certain transceiver or receiver accessibility in the cabin / passenger area.
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