High speed hazardous area communication with safety barriers

Details High speed hazardous area communication with safety barriers High speed hazardous area communication with safety barriers

2006-02-14

2006-02-14

Wong, Albert K. (Department: 2635)

Communications: electrical

Wellbore telemetering or control

C340S855400, C361S052000, C377S024000, C377S099000

Reexamination Certificate

active

06998998

ABSTRACT:
A method and apparatus is disclosed for transmitting digital signals across safety transmission barrier. High data transfer rates are achieved for transfer from a safe certified device across the transmission barrier to a standard or non-rated device. A signal pair is generated including a first digital signal from the safe device and a second digital signal that is phase shifted from the first digital signal. Preferably, the second signal is phase shifted by 180 degrees, essentially being an inverted version of the first digital signal. The first and second digital signals are transmitted across the transmission barrier to a receiver in a safe area. An output signal is then reconstructed based on the falling edges of the first and second digital signals. The reconstructed signal closely approximates the first digital signal.

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