On-line serial communication interface from a current loop to a

Details On-line serial communication interface from a current loop to a On-line serial communication interface from a current loop to a

1985-08-12

1989-03-28

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

340310R, 375 36, H03K 1992, H03K 1716

Patent

active

048167037

ABSTRACT:
An on-line serial communication interface is established from the transmitter of a two line current loop transmitter to a digital circuit such as a computer or hand-held terminal which receives and processes digital voltage pulses. The interface includes a comparator having a positive terminal connected by a capacitor to one of the current lines, and a negative terminal connected to a source of small positive voltage. The output of the comparator is connected to an input port of the digital device. The transmitter modulates the current on the current loop by a small amount with respect to the analog current communicated by the transmitter. This generates voltage pulses in the capacitor which are compared to the selected voltage and are amplified to form large pulses used for communication with the computer or hand-held terminal.

REFERENCES:
patent: 4166963 (1979-09-01), Metcalf
patent: 4623799 (1986-11-01), Nyman, Jr.
patent: 4691328 (1987-09-01), Sterling, Jr. et al.
patent: 4729125 (1988-03-01), Sterling, Jr. et al.
"IC Schematic Source Master", John Wiley & Sons, 1978, p. 342, Precision Process Control Interface.
"Understanding Data Communications", by G. E. Friend et al., 1984, Texas Instruments, pp. 4-25 to 4-26.
"Byte", p. 330, AD inquiry 26, McGraw Hill.

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