G - Physics – 07 – B
Patent
G - Physics
07
B
354/38
G07B 17/02 (2006.01) G06F 3/12 (2006.01) G07B 17/00 (2006.01)
Patent
CA 1193728
IMPROVED NON-VOLATILE MEMORY SERIAL NUMBER LOCK FOR ELECTRONIC POSTAGE METER ABSTRACT OF THE DISCLOSURE An improved serial number lock for inclusion in a non- volatile memory of an electronic postage meter is provided. The non-volatile memory is arranged to provide a field to accommodate a postage meter serial number. The serial number is entered into the meter at the end of the manufacturing process after the meter has been assembled and the components tested. The postage meter includes a routine programmed into the read only memory which is used only once during the life of the meter's non-volatile memory. The routine requires the check of a non-volatile memory location which has been set once the routine has been successfully completed. The setting of this bit prevents reentry into the one time pro- gram. The program can be reused until the bit is set. The bit is set by comparision of the data included in a received message with the value of the data contained in non-volatile memory. If the comparision is true, the bit is set. The serial number message format includes an opera- tional BCD digit as an operational indicator. If the serial number has been entered and the operational indicator set to zero, the serial number will be changed to the value con- tained in the data message. If the operational indicator is a one, the firmware will examine the serial number presently contained in non-volatile memory, and compare it with the value contained in the serial number message. If the result is favorable or true, the program will set the non-volatile memory lock bit thus preventing further access to this program.
422884
Duwel Edward C.
Godenberg John H.
Pitney Bowes Inc.
Sim & Mcburney
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