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FS20X Fire and Flame Detectors
Rotary Switch SW3
Figure 26. Ten-position rotary switch SW3.
The detector has a variety of analog and RS-485 digital communication options. Analog and digital
outputs are available in addition to relay outputs. Select from two analog outputs or two digital outputs
using the ten-position rotary switch SW3. When ‘4-20mA sink’ or ‘4-20mA source’ are selected, the
default RS-485 protocol is FireBusII. When ‘RS-485 FireBusII’ or ‘RS-485 Modbus’ are selected, the
default analog output is 4-20mA source. FireBusII (position 4) is the default setting (highlighted in grey
in the table below). Use Figure 26 and this table to configure SW3:
SW3 Configuration
Position Output Selection
0 4-20 mA sink
1 4-20 mA source
2 RS-485 Modbus
3 Factory use only
4 RS-485 FireBusII
5 Factory use only
6 Factory use only
7 Factory use only
8 Factory use only
9 Factory use only
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