Method and system for multiplexed data transmission from hazardo

Details Method and system for multiplexed data transmission from hazardo Method and system for multiplexed data transmission from hazardo

1992-01-06

1994-11-08

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 62, H04L 2710

Patent

active

053634098

ABSTRACT:
A three frequency system employs frequency shift keying (FSK) to transmit digital data from a plurality of non-stationary objects such as fuel trucks connectable to a plurality of transmit locations such as fuel pumps in a hazardous environment to a "safe area" computer. The three different frequencies are transmitted respectively as three pulses of different frequencies. Two of the three different pulse frequencies respectively represent a binary "one" and a binary "zero" whereas the third different frequency represents a "synchronization" or "start of message" signal which in a preferred embodiment causes the "safe area" computer receiving two consecutive pulses representative of the synchronization frequency from a particular transmit location as it cyclically interrogates the transmit locations to have an "interrupt" signal sent to its central processing unit (CPU) whereupon the central processing unit interrupts the task which it is performing to listen to at least one transmission of the entire two frequency binary "ones" and "zeros" message, the "safe area" computer having been programmed to recognize various sequential locations in the two frequency message as representative of such data as vehicle identification number, fleet identification number, type of fuel requested, etc.

REFERENCES:
patent: 3643160 (1972-02-01), Roy et al.
patent: 4425666 (1984-01-01), Groth, Jr.
patent: 4528675 (1985-07-01), Esterling et al.

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