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Example Installation Scenarios
The following example scenarios explain the usage of the handheld and transmitter modules and lists the
important settings chosen to achieve this.
Scenario 1 – 200 transmitter modules are spaced at 1 meter intervals along a bridge.
The modules spend most of their time in deep sleep and are only activated when the operator uses the handheld.
The transmitter modules are set for a message interval of 333 milliseconds (3Hz) and have a sleep delay of 5
seconds.
On the T24-HR setting the List Size to 6 allows the operator a fast responding Next key that cycles through the
closest 6 modules to allow the operator to note any out of limit readings. The operator checks the Data Tag
displayed on the handheld as the Next key is pressed against the Data Tag painted on the modules affixed to the
bridge.
The operator walks the length of the bridge and stops approximately every 6 metres and quickly scrolls through
the small list size and records the readings of the 6 local modules.
The list dynamically repopulates as he walks along the length of the bridge.
During the walk modules are automatically woken by the handheld as they enter range and as the operator walks
out of range the modules automatically return to sleep.
Scenario 2 – The operator has 3 rooms to monitor.
Each room contains 10 transmitter modules. These modules are always fully awake but operate at a transmission
interval of 10 seconds. There is another module that is logging the data from these modules so their sleep delay
is set to zero to disable that function.
By setting the List Size to 10 the operator can enter the desired room and simply cycle through the 10 modules
present in that room.
Because the transmitter modules only send messages at 10 second intervals it can take up to 10 seconds for a
particular module to be available from the handheld. The timeout on the handheld is set to 31 seconds.
The input to the transmitter modules is very slow to change so although the displayed value only updates every
10 seconds the operator is still seeing a valid reading as he cycles through the transmitter modules. The timeout
of 31 seconds allows for the odd dropped reading but if a module dropped out permanently for whatever reason
the handheld would display ------- after 31 seconds or the module would never appear in the list if it had not
transmitted since the handheld had been turned on.
Scenario 3 – 500 pallets are stored in a warehouse.
Each pallet has a T24-SA transmitter module built in that transmits the weight on the pallet. The T24-SA modules
have been configured so that the LED state is echoed onto the digital output and this is used to power a high
brightness blue LED attached to the front of the pallet. The module transmission intervals are set to 3 per second
and a sleep delay of 10 seconds. The LED flashes at 3Hz while the module is awake and is off when asleep. When
the handheld is displaying the reading from the module its LED is on constantly.
On the handheld the List Size is set to 1. This has the effect of allowing the operator to approach the desired
pallet and press the Next key. This will effectively select the module with the highest radio signal which will be
the one the operator is standing next to and the LED will light to provide visual feedback so the operator knows
he is looking at the correct pallet.
The operator moves to the next pallet and presses the Next key again at which point the previous pallet LED goes
off and the closest pallet LED activates.
As the operator moves out of range, pallets go back to sleep because of their sleep delay settings.
Mantracourt Electronics Limited
213
T24 Telemetry User Manual
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