33
Siemens Building Technologies
Cerberus Division
E1481b
06.2000
12.4 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. 26 shows how to connect the GW-21 UARTs numbered 3,4,5 and 6 on the screw
terminal block to the GW-20.
Fig. 26 shows how to connect the GW-21 UARTs 1 and 2 on the two DB9 connectors
of the connection board to the GW-20.
TX
RX
GND
1 1 32 31
4 4 34 33
2 2 36 35
GW-21
Net-M Pad
Male connector
Fig. 26 GW-21/GW-20 connection (screw terminal block)
GW-21
Net-M Pad
UARTs 1 and 2
Male connector
Male connector
Fig. 27 GW-21/GW-20 connection (DB9 connectors)
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.
Summary of Contents for Cerberus GW-21
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