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CPU board
I/O expansion
board
UART 6
UART 5
Siemens Building Technologies
Cerberus Division
UART1
(modem without RI
and DCD)
DB1
31
32
TX
TX
RX
RX
GND
GND
35
36
DB2
UA RT2
(Full modem)
Fig. 20 The connection board
LON
CN4
CN3
CN2
TX
GND
GND
RX
CN5
CN6
TX
GND
GND
RX
CN1
Power
(13.8 V)
CPU board
CD95800
1
2
UART3
3
4
1
2
UART4
3
4
I/O expansion
board
CD95802
29
E1481b
06.2000
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