Bar code reading and data collection unit with ultrasonic wirele

Details Bar code reading and data collection unit with ultrasonic wirele Bar code reading and data collection unit with ultrasonic wirele

1997-03-25

1999-09-28

Le, Thien

Registers

Coded record sensors

Particular sensor structure

23547202, G06K 710

Patent

active

059592842

ABSTRACT:
A bar code scanner includes aseparate transmitter and receiver, each being able to ultrasonically transmit and receive data, respectively. The receiver transmits an acknowledgement signal when a protocol is received, and sends the acknowledgement signal to the transmitter which, unless it receives the acknowledgement signal, will retransmit the protocol a predetermined number of times. The transmitter includes a receiver which monitors an ultrasonic frequency band for a time period in which transmission by the transmitter is not allowed. The time period corresponds to a time when another ultrasonic signal in the ultrasonic frequency band is detected by the receiver of the transmitter. Transmission by the transmitter is allowed as soon as the another ultrasonic signal is no longer detected by the receiver of the transmitter.

REFERENCES:
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patent: 4841132 (1989-06-01), Kajitani et al.
patent: 5157687 (1992-10-01), Tymes
patent: 5331580 (1994-07-01), Miller et al.
patent: 5367151 (1994-11-01), Dvorkis et al.
patent: 5371347 (1994-12-01), Plute
patent: 5389917 (1995-02-01), Lamanna et al.
patent: 5665956 (1997-09-01), La et al.
patent: 5808285 (1998-09-01), Rockstein et al
patent: 5880498 (1999-01-01), Tymes et al.

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