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Micro-controller with fsk modem

A technology of modem and microcontroller, applied in modulation carrier system, frequency modulation carrier system, digital transmission system, etc., can solve the problems of increasing cost and required board space, etc.

Active Publication Date: 2011-01-05
SPECTRUM CONTROL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Where input / output channels are isolated, each channel is isolated by a transformer if a modem is shared, otherwise a modem is required per channel, increasing cost and required board space

Method used

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  • Micro-controller with fsk modem
  • Micro-controller with fsk modem
  • Micro-controller with fsk modem

Examples

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Embodiment Construction

[0022] A microcontroller with a built-in FSK modem function will be described below. In one embodiment, the FSK modem functionality is implemented as a software solution so that no hardware including a conventional FSK or HART modem is required. Such software solutions can be hard-coded into the microcontroller's memory to execute upon receipt of input signals from the field devices or output signals generated by the PLC and sent to the field devices. This software solution implements the functions of a zero-crossing detector, counter and comparator, among other functions, as explained in more detail below.

[0023] Figure 2B An embodiment using the input / output channel 90 of a microcontroller with built-in FSK modem functionality is illustrated. A microcontroller 70 with built-in FSK modem functionality can be placed on the isolated side of the I / O channel 90 and connected to the main microcontroller 74 which interfaces with the PLC backplane ASIC. Isolation is facilitate...

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PUM

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Abstract

A micro-controller to perform the FSK (HART) modem functions as well as communications and control functions in an isolated channel implementation is described. In one embodiment, the micro-controller comprises: a processor, an analog-to- digital converter configured to transform received analog signals into digital values at a predetermined digital sample rate; and a memory unit containing a setof computer- executable instructions that, when executed on the processor, provide a built-in FSK bi-directional modem function that converts the received digital values into binary signals. The FSK (HART) demodulation function is performed by the micro-controller with the built-in FSK modem function in three sequential phases implemented in computer code: (1) zero crossing and amplitude detection; (2) bit stream and timing generation, and (3) character generation and bit synchronization.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 017466, filed December 28, 2007, which is incorporated herein by reference in its entirety. Background technique [0003] A Programmable Logic Controller (PLC) is a digital computer typically configured to automate electromechanical processes such as the control of machines on a factory assembly line, amusement rides, or lighting fixtures. Those skilled in the art and others will recognize that PLCs can be used in many different industries and machines, such as packaging and semiconductor machines. Unlike general-purpose computers, PLCs are designed for multiple input and output configurations, extended temperature ranges, resistance to electrical noise, vibration and shock. The programs that control the operation of the machine are usually stored in battery-backed or non-volatile memory. A PLC is an example of a real-time system because output r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/10
CPCH04L27/1563
Inventor C·戈博恩J·坦嫩豪斯
Owner SPECTRUM CONTROL INC
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