PTI security systems VP keypad controls entry, Installation And Operation Manual

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Once the card is read, the keypad will go through the security checks
described in the Security Checks section. If all of the security checks
pass, the keypad will send the card data to the controller and wait for a
response. The message on the display will change to the following while
waiting for a response.
* PLEASE WAIT *
When the keypad receives the response from the controller it will show
the response message in the display. The messages that can be received
from the controller vary depending on the type of response. The various
response messages are shown in the Access Response Messages
section.
Security Checks
A series of security checks are performed by the VP before allowing
entrance. These checks are used to prevent unauthorized access attempts.
When a customer uses an access code, the checks are performed as
soon as the code is entered. If the customer uses a card, the checks are
performed as soon as the card has been swiped in the magnetic stripe
reader or presented to the proximity reader.
Communications Check. The first item checked is the communications
between the units on site and the controller. When the keypad is not
communicating with the controller and the Trip Relay NoComm is disabled,
the unit will display the following message and revert back to the date and
time.
* PLEASE WAIT *
Tamper Check. The VP performs a tamper check to see if the tamper
switch has been enabled. If it is enabled, it ensures that the switch is
secure. If either condition is true or the tamper is disabled, the VP will
proceed to the next security check. If the VP detects tampering, it will
display the following message and no further access attempts will be
allowed.
Sorry -
Tamper Lockout