Siemens Cerberus GW-21, Technical Manual, Page: 17 / 44

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Siemens Building Technologies
Cerberus Division
E1481b
06.2000
i
If only one LMS workstation is foreseen, it can use any of the six UART available;
if two LMS workstation are installed, they MUST occupy UART 1 and 2.
The subsystem network address (to be specified in the LMS configuration software) is
automatically assigned to the UARTs, from the lowest to the highest, starting from net-
work address 0. UARTs used by LMS are of course skipped (see the examples in Sec-
tion 6.5).
You must then set the communication baud rate according to the suggested proto-
col/baud rates (See section 5).
4.2.2 Cerban vitality telegram
The DIL-Switch S1-2 has the optional function to filter the Cerban vitality telegram; the
DIL-Switch is valid for all of the Cerban line which are defined on the gateway.
The only reason to filter the vitality telegram is to limit the traffic of messages to the
LMS station(s). Note that if the vitality check is enabled at LMS level, then this DIL-
Switch must be set to ON, else LMS will generate false fault events.
S1-2 Function
OFF Vitality telegram filtered
ON Vitality telegram not filtered
Tab. 6 Cerban vitality telegram filtering
4.3 Configuration by Flash EPROM
If you have the configuration EPROM, you have to set OFF the DIL-Switch S1-1. The
default configuration for this DIL-Switch set is for EPROM
not installed, so you actually
have only to verify the settings.
Even if the Flash EPROM configuration is enabled, you must set the communication
baud rate with subsystems using the DIL-Switches and according to the suggested
protocol/baud rates (See section 5).
4.4 Two level network
In the two level network or in the redundant configuration (shown in Fig. 5 and Fig. 6)
the gateway GW-21 is connected to a GW-20. You have to set the DIL switches for the
protocol selection of the used UARTs as specified in Tab. 4.
You must then set the communication baud rate according to the suggested proto-
col/baud rates (See section 5).