Electronic postage meter having plural computing systems

Details Electronic postage meter having plural computing systems Electronic postage meter having plural computing systems

H - Electricity

04

L

354/34

H04L 5/14 (2006.01) G06F 3/12 (2006.01) G06F 13/42 (2006.01) G07B 17/00 (2006.01)

Patent

CA 1159563

ELECTRONIC POSTAGE METER HAVING PLURAL COMPUTING SYSTEMS ABSTRACT OF THE DISCLOSURE An electronic postal meter has a control unit, an accounting unit and a printing unit, each incorporating a CPU having a separate crystal controlled cloak. Communication between the units is serial character asynchronous, bit synchronous, in message form, with the bits of the messages being timed in accordance with a given schedule for synchronous control. The messages themselves, upon receipt by a receiver, are returned bit by bit to the transmitter, for checking, whereupon the transmitter sends a no-error pulse upon successful comparison of the transmitted message and the message received from the receiver. All control and data signals utilize the same pair of conductors in each direction with precisely defined timing for control.

363541

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