Apparatus and method for using a communications port in polling

Details Apparatus and method for using a communications port in polling Apparatus and method for using a communications port in polling

1998-08-25

2000-08-01

Ray, Gopal C.

Electrical computers and digital data processing systems: input/

Access polling

710 46, 713300, G06F 1300, G06F 126

Patent

active

060981423

ABSTRACT:
A communications port adapter and method for using a communications port of a host computer in polling mode and without interrupts. The communications port adapter includes at least a converter circuit for converting an input signal from a measuring device to frequency, a switching component connected to an output of the converter circuit for transmitting a frequency output signal, and a counter circuit having an input connected to the switching component for receiving the frequency output signal of the converter circuit and an ouput coupled to the communications port of the host computer.

REFERENCES:
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patent: 4751634 (1988-06-01), Burrus, Jr. et al.
patent: 5222062 (1993-06-01), Sharma et al.
patent: 5247671 (1993-09-01), Adkins et al.
patent: 5557633 (1996-09-01), Staab et al.
patent: 5634074 (1997-05-01), Devon et al.
patent: 5668716 (1997-09-01), Otomo
"Use RS-232C Port To Measure Pressure", W. Stephen Woodward, EDN Magazine, Aug. 1, 1997, p 104.
"Transistor Forms RS-232C Digital Thermometer", W.S. Woodward, EDN Magazine, May 9, 1996, p 92.
"RS-232 Port Powers Frequency Counter", Maxim Integrated Products, Electronic Design, Feb. 9, 1998, p. 132.

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