9
Siemens Building Technologies
Cerberus Division
e1148c
06.2000
5
Cables and connections
5.1
Connection to GW-20
The figure below shows how to connect the Cerban Splitter CBS-3 to the Gat eway GW-
20, to transmit messages to the CMS/LMS monitoring system.
Only UARTs 3 and 4 can be connected to the Gateway.
CBS-3
GND
Rx3
Tx4
GND
Tx3
Rx2
GND
Rx4
Tx1
GND
Rx1
Tx2
15
17
16
14
12
13
18
8
10
9
7
5
6
11
1
3
2
4
UART2
UART3
UART4
UART1
7
6
5
4
2
1
8
9
3
Net-M Pad in GW-20
Male connector
Fig. 6 GW-21/GW-20 connection (screw terminal block)
5.2
Connection to GW-21
The figure below shows how to connect the Cerban Splitter CBS-3 to the GW-21 asyn-
chronous port.
CBS-3
15
17
16
14
12
13
18
8
10
9
7
5
6
11
1
3
2
4
GND
Rx3
Tx4
GND
Tx3
Rx2
GND
Rx4
Tx1
GND
Rx1
Tx2
UART2
UART3
UART4
UART1
GND
Rx6
Tx6
Rx5
GND
Tx5
GND
Rx3
Tx4
GND
Tx3
Rx2
GND
Rx4
Tx1
GND
Rx1
Tx2
15
17
16
14
12
13
18
8
10
9
7
5
6
11
1
3
2
4
UART2
UART3
UART4
UART5
UART6
UART1
GW-21
Fig. 7 Connection to GW-21
