Measurement Specialties PMD-1024HLS manual Ground terminals, Counter terminal

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PMD-1024HLS User's Guide

Functional Details

If you want to sink the maximum of 64 mA per DIO line, you can only do so with up to six lines (440 mA

÷64 mA/line = 6.8 ≈ 6 lines). To sink current with all 24 DIO outputs at any one time, you can sink a maximum of 18 mA per line.

Ground terminals

The nine ground (GND) connections are identical, and provide a common ground for all PMD-1024HLS functions. Refer to the pinout diagram on page 3-2for the location of the GND terminal.

Counter terminal

Pin 20 (CTR) is the input to the 32-bit external event counter. Refer to the pinout diagram on page 3-2for the location of this terminal. The internal counter increments when the TTL levels transition from low to high. The counter can count frequencies of up to 1 MHz.

Pull-up/pull-down terminals

You can wire pin 11 (Port C Pull-up/Pull-down), pin 13 (Port B Pull-up/Pull-down), and pin 15 (Port A Pull-up/Pull-down) to support a pull-up or pull-down connection. These terminals configure the internal 47K resistors on the PMD-1024HLS.

Refer to the pinout diagram on page 3-2for the location of these terminals. These terminals are configured as open by default.

ƒTo configure a pull-up connection for a specific port, wire the pull-up/pull-down terminal to a USB +5 V terminal.

Figure 3-5. Pull-up connection for Port A

3-5

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Contents Page PMD-1024HLS Management committed to your satisfaction Trademark and Copyright Information Table of Contents About this Users Guide Where to find more informationWhat you will learn from this users guide Conventions in this users guideChapter Introducing the PMD-1024HLSSoftware features PMD-1024HLS block diagramConnecting a PMD-1024HLS to your computer is easy What comes with your PMD-1024HLS shipment? Installing the PMD-1024HLSHardware SoftwareBe sure you are using the latest system software Installing the software Installing the hardwareUnpacking the PMD-1024HLS DocumentationIf the LED turns off External components USB connectorFunctional Details Screw terminal pins Screw terminal wiringMain connector and pin out False Output sink current limits Power terminalsFor more information on digital signal connections Pull-up/pull-down terminals Ground terminalsCounter terminal Pull-down connection for Port a Digital input/output SpecificationsCounter section PowerGeneral Main connector and pin outEnvironmental MechanicalUSA Declaration of ConformityMailinfo@mccdaq.com