1.6.4 System and Local Bus
Both System and Local bus have 4 signal pairs: audio and data power supplies, audio and data signals.
System Bus is a systems wide data bus where all Digital Amplifier units are connected. Paging units and control panels
can be connected to either System or Local Bus. If redundant Bus for the system is needed, Local Bus can be extended
to be as a redundant System Bus.
Data bus cabling can be done with CAT5 or CAT6 category cable, but also other cable types with twisted pairs can be
used.
All paging and control are powered via buses and no external power supplies are needed.
1.6.5 Setting the Address
Each units get own address from configuration program. Address for Digital Amplifier is set with back panels dip switch.
Address must be set before power-up.
DIL-switch at ON position
1.6.6 Control Inputs and Outputs
1.6.6.1 Control Inputs
Digital Amplifier has got eight programmable logic inputs. Opto-coupled inputs are controlled with potential free contacts
(relay or switch). Inputs can be programmed to activate either open or close contact. Programmable functions are:
automatic messages, preset changes, call off functions and various monitoring and status functions.
18 | AlphaAnnounce Digital Amplifier
