Attero Tech SquawkBox Manuale d'uso - Pagina 13

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5.2 – Override Test

The override test form allows the user to test the override settings on a SquawkBox system. It can be used to generate full

system or partial system overrides as required. Select the EMERGENCY option for a full system override or select the blank

option for a partial system override. If a partial system override is required, one or more of the Group check boxes will also

need to be checked. These refer to which groups of SquawkBox units should be included in the override.

The override can also include substitute values that can be used instead of each devices' own override defaults. Initially, the

override test is setup to use each SquawkBoxes default override settings with the on-screen values taken from the set-up of

the device whose configuration is being edited. The substitute values are applied to each SquawkBox that the override

affects in place of the defaults override settings when the override is active.

*Note: The substitute values are only temporary and valid as long as the override lasts. The default override values of those

SquawkBoxes that are overridden are not changed.

If values that differ from the defaults are required, prior to starting the override test, clear the "Use Default" box for the

setting to be substituted and then change the setting to the required value.

To start the override test, click the start button. The override will remain active until the stop button is pressed. The

override will also terminate if the form is closed.

*Note: A SquawkBox that is already in overridden cannot be overridden again. If a second override occurs, the values from

the initial override will be retained. However, any unit in override WILL drop out of override it is sees the stop packet. If this

packet is a broadcast, such as used by this test facility, any unit in override will drop out irrespective of the number of

overrides active on the system.

5.3 – Activating the Override

The override is activated by sending a UDP packet to port 4120 on one or more SquawkBox devices from an Ethernet device

(such as a PC). The packet sent contains a small amount of data. This data includes the type and scale of the override as

well as optional parameters that can be used as a substitute for the devices' own override default settings. The packet must

contain at least the following fixed length fields:

Field

Type

Tag

9 char +

null

groupMask

16-bit

For a system-wide override, set the tag field to "EMERGENCY" and broadcast the packet to all units by using an appropriate

broadcast destination IP address for the network in use. If the tag field is set to EMERGENCY, a group mask is not required.

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Figure 6 - Override Test Form

Description

A null terminated character string. This should either be blank (first character a null) for a

general override or set to "EMERGENCY" for a system-wide override of all units.

16-bit mask, one bit per group. Group 1 is the LSB, group. Group 16 is the MSB.

Page 9

SquawkBox

User Manual

614-00007-04