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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 connect

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.

대표청구항 ▼

[ What is claimed is:] [1.] A communications port adapter for using a communications port of a host computer in polling mode, said communications port adapter comprising:a converter circuit having at least a converter input and a converter output, said converter input coupled to a measuring means fo

[ What is claimed is:] [1.] A communications port adapter for using a communications port of a host computer in polling mode, said communications port adapter comprising:a converter circuit having at least a converter input and a converter output, said converter input coupled to a measuring means for receiving an output signal from said measuring means, said converter circuit converting said output signal to a frequency signal, said frequency signal having a frequency parameter proportional to the output signal of said measuring means, and transmitting said frequency signal through said converter output;a switching means coupled to said converter output; anda counter circuit having at least a counter input and a counter output, said counter input coupled to said converter output through said switching means, said counter input receiving and storing said frequency signal from said converter output when a signal pulse is transmitted without the use of interrupts from said communications port of said host computer and transmitting at said counter output a logic status signal through said communications port to said host computer when said counter circuit changes logic status.