Infrasonic Alarm (490-0825) Setting Security Code Faxback Doc. # 8931 The alarm system lets you set your own security code. This prevents others with alarm systems that operate on the same frequency from arming or disarming your system from a remote location. To set the security code: 1. Remove the transmitter's cover. 2. Set the transmitter's four position dip switch to any combination of ON and OFF. Note: If you change the transmitter's security code or if you use a new transmitter to replace one you lost, you must reinitialize the alarm receiver by disconnecting the receiver's power for about 1 minute. (smc-03/02/94)