Tait TB8100 - Page 44

44 Functional Description TB8100 Installation and Operation Manual
© Tait Electronics Limited June 2005
Figure 4.4 System control bus high level block diagram
Power
Supply
Fan
Switch
Fan
Switch
3mA
Current
Source
Micro-
processor
Micro-
processor
Microphone
Compressor
Speaker
Buffer
Buffer
PMU Fan
RS-232
Converter
Microphone
28V
Service Kit &
Calibration Kit
Microphone Switch
RS-232 Open Collector TTL
Open Collector TTL
Speaker
PA Fan
(To I C Port
Expander)
2
(To I C Port
Expander)
2
Microphone
Rotation Output
Power/Ground
PMU Fan
IC
2
IC
2
IC
2
IC
2
IC
2
IC
2
IC
2
RS-232 PMU Fan PA Fan 28V
UART
28V Input from PMU
28V
28V
Subrack Interconnect Board
RISC
CODECsDSP
Buffer
Buffer Buffer
Microphone Speaker
Control Panel
Reciter
PMU
PA
I C Port
Expander
2
Digital Outputs Digital Inputs
15-Way D-range
16-Way IDC
16-Way IDC
16-Way IDC
PA Fan
Rotation Output
Power/Ground