Keyscan Technical Guide (PC109x - 04.12)
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Restore Default Settings – Jumper J1 (Clear Memory)
Jumper J1 is used to restore the control board’s factory default settings. You must restore the factory default
settings whenever you have performed one or more of the following procedures to a control board:
• when a control board has been newly installed
• when an EPROM or Reader PROM has been changed
• when System Mode Jumper J17 has been changed (short J6 momentarily before clearing memory)
• when System Configuration Jumper J16 – card countdown or card name storage settings only – have
changed
Procedure
To restore the factory default settings, ensure the control board has power, short jumper J16 – pin H,
short J1 momentarily, and then remove the jumper on J16 – pin H.
After placing the jumper on J1, the System Status LED begins flashing RED and the control board’s piezo
emits a cycle of two (2) short beeps followed by a pause. This occurs for approximately 120 – 150
seconds while the factory default settings are loaded and the database information is erased from the on-
board memory. Do not make any changes to the control board, such as altering jumpers or powering
down the board, while the factory defaults are being restored or you will have to repeat the procedure.
After the System Status LED has stopped flashing, the factory default settings have been restored and the
Keyscan database has been cleared from the on-board memory. After you have restored the factory
defaults, perform an upload from a PC with a Keyscan Client software module so the Keyscan database is
transferred to the control board’s on-board memory.
If this is a new installation, enter the site information in the Keyscan Client software and then upload the
Keyscan database information to the control board(s). Until you perform an upload from a Keyscan Client, the
access control unit(s) will not function. Also, see Power Up and Test Voltages for a new installation.
Clear Memory without Full Memory Test
Short jumper J16 – pin H. Hold down the Tamper Switch on the ACU enclosure while shorting Jumper J1 –
Clear Memory. Then release the Tamper Switch and remove the jumper from J16 – pin H. This clear
memory procedure is shorter in duration for restoring the factory defaults – approximately 15 to 20
seconds – but bypasses performing a full memory test on the control board. This method to clear memory
should not be used on a newly installed control board.
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