Electronic postage meter having plural computing systems

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

1981-05-06

1983-12-20

Smith, Jerry

Boots, shoes, and leggings

364900, 364704, 364409, G06F 1520

Patent

active

044221487

ABSTRACT:
An electronic postal meter has a control unit, an accounting unit and a printing unit, each incorporating a CPU having a separate crystal controlled clock. 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.

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