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Transmitter Module Sleep Delay Settings
Transmitter modules have a Sleep Delay setting (set in seconds) which allows the modules to go into Sleep mode
when their data messages are no longer required. This allows much longer battery life to be achieved.
Setting Sleep Delay to zero disables this function in the Transmitter modules and they will only go into Sleep
mode when told to do so.
Most Receiver modules and T24 software send Stay Awake messages when they see messages arrive from
Transmitter modules. In the Transmitter modules, if the Sleep Delay time period has elapsed without a Stay
Awake message arriving then the module will enter Sleep mode.
Usually the Stay Awake messages are sent every 5 seconds so Sleep Delays should be set to at least 10 seconds
but can be set to anything up to an hour for situations where the Receiver is likely to be out of range for periods
of time but where the Transmitter module is required to stay awake and in normal operational mode during that
time. It is usual that Sleep Delays are set somewhere between 30 and 300 seconds when required.
Pairing
Because you need to know the radio settings configured in a module to be able to configure it, and there are no
visible clues to what those settings may be, there is a feature used by T24 modules that enable the radio settings
(i.e. the radio channel and the group key) to be determined and matched between two T24 modules.
Pairing is only required to determine and match radio settings and optionally to put T24 Transmitter modules in
configuration mode. Because in some installations the T24 modules can be buried deep inside other equipment
there had to be a way of indicating that a module has been selected to pair with without having physical access
to that module. Pairing was therefore designed to be activated by removing and re-applying the module's power.
In some cases this is not practical so another possible solution is
Pairing From T24 Toolkit
When using the T24 Toolkit and a base station, pairing is used to connect to a module without having to know
anything about it beforehand. To pair, remove power from the required module, click a 'Pair' button in the
software and re-apply power to the module. The base station and module negotiate settings and the base
station is automatically configured to match the radio settings from the module and places the module into
configuration mode. Now the module can be configured and when complete it will return to normal operational
mode.
Pairing From a Receiver Module
Some Receiver modules allow pairing to a Transmitter module without requiring the T24 Toolkit. For example
some handheld readers offer this feature by turning them on while holding a certain key after which the power is
applied to the Transmitter module. The radio settings are then negotiated and the Transmitter module is
automatically configured to match the handheld radio settings. The handheld learns the ID and data tags
required to be able to use messages from the Transmitter module. In this case no configuration mode is required
so the Transmitter module simply continues to operate in normal mode but with altered radio settings.
Mantracourt Electronics Limited
Soft Pairing
see later.
20
T24 Telemetry User Manual
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