Doc No. FM0804 issue 4 Page 16
10. NETWORK TERMINATION BOARD
SYSTEM NETWORK
There are 3 blocks of pluggable XT2 network terminals - if there are more than 3 legs simply connect in parallel in any
block. The terminals on the system network have the following functions;
Terminal
Function
24V
24V DC supply for network devices - fused at 1.6A
0V
Ground
TX+
RS485 bi-directional data bus
TX-
SP1
Audio 1: intercom loudspeaker & microphone
SP2
MIC
SP1
Audio 2: intercom loudspeaker & microphone
SP2
MIC2
PA AMPLIFIER
The PA Amplifier(s) are connected to the Termination board. One PA amplifier can drive 80 intercoms, a second PA
Amplifier will be required on installations with more the 80 intercoms and the PA wiring must be split into 2 legs.
Terminal
Function
EN
Enable signal to PA amplifier board
AUD
Audio to PA amplifier input
0V
Ground
TX+
RS485 bi-directional data bus
TX-
PA AMP 1 INA
PA audio (100V line) from PA amplifier 1
PA AMP 1 INB
PA AMP 2 INA
PA audio (100V line) from PA amplifier 2
PA AMP 2 INB
DOOR ENTRY NETWORK
The door entry panel(s) are connected to the Termination board;
Terminal
Function
24V
24V DC supply door panel - fused at 1.6A
0V
Ground
TX+
RS485 bi-directional data bus
TX-
SP1
Audio 1: door panel loudspeaker & microphone
MIC1
SP1
Audio 2: door panel loudspeaker & microphone
MIC2
C1
Audio 1: telephone loudspeaker (C2) & microphone (C1)
C2
C1
Audio 2: telephone loudspeaker (C2) & microphone (C1)
C2
FERRITE CORE
Each leg of network wiring should be looped through a ferrite core before being
connected to the Termination board.
This will suppress any voltage transients induced on the Network wiring and
greatly reduce the likelihood of damage to the main CPU board.
Four ferrite cores are provided in the kit of parts with the Advent XT2 controller,
for additional ferrite cores order Tynetec P/No. T06050.
