2. Operation 47
5. The sensor id should flash, press Next, the sensor type should flash; this means it is adjus-
table. Use Up and Down to select “No sensor”. This will remove the sensor from the sensor list
but retain the sensor id.
Tip
Press Next and Back simultaneously to remove the sensor from the sensor list. The id
number will revert to 0, and the sensor type will revert to "No Sensor".
6. Press Enter to save any changes made to the sensor list.
7. Press Exit three times to return to the operation display.
2.13 Network Options
2.13.1 Listen Only Mode
When the GS550 is started it normally wakes up the sensors in the sensor list and takes control of
them. The last display started that is programmed for a sensor becomes that sensor’s network
controller. This means that if a second display is programmed for a sensor, it will take control of it;
the sensor will no longer acknowledge communication from the first display. Occasionally it may be
useful to monitor an installed system from a remote display without disrupting the existing network.
The GS550 can be programmed to operate in “listening mode”. In this mode the GS550 will display
information from programmed sensors without becoming the network controller.
Important!
Sensors can only have one network controller at a time. To receive communication from a
sensor without taking control of that sensor a display must first be programmed in "listen-
ing mode".
Program the listen only mode.
1. Press Menu, and then Next three times.
2. Press Enter, Next eight times, and then Enter to go to menu 4I1).
3. Use Up and Down to switch between “network controller” and “listen only” modes.
4. Press Enter to save any change.
5. Press Exit three times to return to the operation display.
When a display is adjusted to listen only mode the following message flashes three times
during the start-up routine: “The display is in listen only mode”.
Tip
To regain network control of programmed sensors adjust the GS550 to "network control-
ler" (menu 4I1, see the procedure above), shut the display off, and then start it again.
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