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16
Siemens Building Technologies
Cerberus Division
6
Cables and Connections
6.1
Connection to LMS
Fig. 10 and Fig. 11 show how to connect the GW-21 UARTs 1, 2, 3, 4, 5, 6 on the
screw terminal of the connection board to the LMS for a 9 pin connector and a 25 pin
connector respectively.
If there is only one LMS operating station, it can be connected to any UART among
those available. However, if there are two Operating Stations, they must be connected
to UARTs 1 and 2.
TX
1
4
7
RX
2
5
8
GND
3
6
9
Fig. 10 Connection to 9 pin D connector (screw terminal block)
TX
1
4
7
10 13
RX
2
5
8
11 14
GND
3
6
9
12 15
Fig. 11 Connection to 25 pin D connector (screw terminal block)
10
13
16
11
14
17
12
15
18
GW-21
16
17
18
GW-21
Female
1
2
3
4
5
LMS
Female connector
LMS (PC)
6
7
8
9
E1481b
06.2000
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