Measurement Specialties manual Introducing the PMD-1024HLS, Chapter

Page 7

Chapter 1

Introducing the PMD-1024HLS

This user's guide contains all of the information you need to connect the PMD-1024HLS to your computer and to the signals you want to measure. The PMD-1024HLS is part of the Personal Measurement Device brand of USB-based data acquisition products.

The PMD-1024HLS is a USB 2.0 low-speed module supported under Microsoft® Windows® 98 (2nd edition), Windows ME, Windows 2000, and Window XP. It is designed for USB 1.1 ports, and was tested for full compatibility with both USB 1.1 and USB 2.0 ports.

Refer to the "Be sure you are using the latest system software" note in Chapter 2, "Installing the PMD- 1024HLS," to make sure you are using the latest USB drivers.

The PMD-1024HLS is a high drive, 24-line digital I/O module that includes one 32-bit external event counter. The PMD-1024HLS is powered by the +5 volt USB supply from your computer. No external power is required.

An emulation of the 82C55 in mode 0 (only) sets the direction of the 24 digital I/O lines in four ports. Each digital port can be configured for either input or output. The 74FCT244 outputs are high-drive TTL, capable of sourcing 15 mA and sinking 64 mA.

The PMD-1024HLS is shown in Figure 1-1. All I/O connections are made to the screw terminals on each side of the PMD-1024HLS.

Figure 1-1. PMD-1024HLS

1-1

Image 7
Contents Page PMD-1024HLS Management committed to your satisfaction Trademark and Copyright Information Table of Contents Conventions in this users guide Where to find more informationAbout this Users Guide What you will learn from this users guideChapter Introducing the PMD-1024HLSSoftware features PMD-1024HLS block diagramConnecting a PMD-1024HLS to your computer is easy Software Installing the PMD-1024HLSWhat comes with your PMD-1024HLS shipment? HardwareDocumentation Installing the software Installing the hardwareBe sure you are using the latest system software Unpacking the PMD-1024HLSIf the LED turns off Functional Details USB connectorExternal components Main connector and pin out Screw terminal wiringScrew terminal pins False For more information on digital signal connections Power terminalsOutput sink current limits Counter terminal Ground terminalsPull-up/pull-down terminals Pull-down connection for Port a Digital input/output SpecificationsCounter section PowerMechanical Main connector and pin outGeneral EnvironmentalUSA Declaration of ConformityMailinfo@mccdaq.com