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Driver for the Radio Shack hand-held Digital Multi Meter

by: Member
‎05-15-2006 09:58 AM
Last Edited by: Member Example_Scrubber_Faxu ‎04-20-2017 07:35 AM

Products and Environment

This section reflects the products and operating system used to create the example.

To download NI software, including the products shown below, visit ni.com/downloads.

    Hardware

  • Modular Instrumentation

Code and Documents

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Overview

    LabVIEW 2012 instrument driver for the Radio Shack hand-held Digital Multi Meter (DMM), model "22-812" AKA "220-812" AKA "220-0812"

 

Description

    The attached .zip contains LabVIEW "driver" software for reading values from a RS220-812 DMM. Data is output via a DB9/RS232 connector. This DMM is not controllable via its RS232, it's functional-state is set manually. The values output by this DMM are (apparently) the actual data-stream which drives the instrument's LCD. This software reads the LCD data, builds a floating point value and several boolean values which reflect the instrument's state. The LCD data is interpreted according to a PDF found on the web and included here in the driver's .zip file.

 

Requirements

    Software

        LabVIEW 2012(or compatible)

        NI-VISA 

    Hardware

        Radio Shack hand-held Digital Multi Meter (DMM), model "22-812" AKA "220-812" AKA "220-0812"

 

**This document has been updated to meet the current required format for the NI Code Exchange.** 

Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.

Comments
BertMcMahan
Trusted Enthusiast
Trusted Enthusiast
on
‎04-03-2013 06:12 PM
‎04-03-2013 06:12 PM

Seems to work well in the initial testing I did with it. One thing to keep in mind: if the display is lighting up the m, M, or k indicators, you need to scale the value reported by these VI's. These VI's will return the value actually displayed on the screen. For example, in V mode, a measurement of 0.050 V would return a 50 in this VI since that's what the display reads. You will need to look for the boolean value reporting that the "m" indicator is lit up, and scale it accordingly.

I would also recommend closing the serial connection in the example VI before running it. When "STOP" is pressed, the VI simply stops, rather than closing the connection. Not sure it matters too much but it's always good practice to close any references you open.

Other than that, it works great in LV2012.

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