3
Siemens Building Technologies
Cerberus Division
e1148c
06.2000
2.2
The connection board
The connection board (CD96811) has two connectors. One is used to insert the CPU,
the other is not used in CBS-3.
All the UARTs, from 1 to 4, are accessible through screw connectors located on the
right side of the connection board. Only the TX, RX and GND signals are available.
In the lower right corner of the connection board there is the power supply block with
two pins and -. You must connect here the voltage source (10 to 30 V d.c.).
GND
RX4
TX4
GND
RX3
TX3
GND
RX2
TX2
GND
RX1
TX1
+
-
Vdc
Fig. 2 The connection board
