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Issue: 0.4
Prepayment Function
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P450 In Home Energy Monitor - DRAFT User Manual
11.7.1 10-minute lock out
The P450 IHEM will allow the user 3 attempts to enter a code during a 5-minute time frame before the
first lock out mechanism is applied.
Once the 3 failed attempts have been performed the P450 IHEM will disable access to the code entry
screen for 10 minutes.
The lock out will be displayed on the P450 IHEM in a visual message stating:
‘
Code entry is disabled
Try again in 10 minutes
’
. This can be seen in the following example.
Figure 73 Code Entry Disabled for 1 Minute
Once a lock out message has been displayed the user can still operate all other functionality of the
P450 IHEM except the code entry screen.
If the user attempts to re-access the code entry screen the previously displayed message will be
shown to the user once again.
The message will not be updated or cleared from the screen until the defined lock out period has
finished.
11.7.2 1 hour lock out
If the user again attempts to enter a code after the end of the first lock out period, then the P450
IHEM will allow 3 further attempts during a 1 hour time frame to enter the correct code before the
second lock out mechanism is applied.
Once the 3 further failed attempts have been performed the P450 IHEM will disable access to the
code entry screen for 1 hour.