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Siemens Building Technologies
Cerberus Division
6.2
Connection to GW-20
This type of connection applies only to two level network configurations of the type
shown in Fig. 5 and Fig. 6.
Fig. 12 shows how to connect the GW-21 UARTs numbered 1, 2, 3, 4,5 and 6 on the
screw terminal block to the GW-20.
1
4
7
TX
2
5
8
RX
GND
3
6
9
Fig. 12 GW-21/GW-20 connection (screw terminal block)
All connections should be done using a shielded cable and D connectors with metallic
shells. Fasten the connector to the back plane of the gateway using the screws on the
connector shell.
6.3
Gateway to subsystem connection
Each connector of the Subsystem Pad is used for one serial ports and to the connector
is linked only one subsystem of any type (Fig. 13).
To CSxx modem
terminal block
RX
2
TX
4
GND
3
Fig. 13 GW-21 to CSxx subsystem (screw terminal block)
10
13
16
11
14
17
12
15
18
GW-21
1
4
2
5 8 11 14 17
3
6 9 12 15 18
Male connector
Net-M Pad
TX
7
10 13 16
RX
GND
17
E1481b
06.2000
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