Measurement Computing PCM-DAS08 Bedienungsanleitung
PCM-DAS08
Analo
g
/Di
g
ital Inputs
USER’S MANUAL
Revision 4
October, 2000
MEGA-FIFO, the CIO prefix to data acquisition board model numbers, the PCM prefix to data
acquisition board model numbers, PCM-DAS08, PCM-D24C3, PCM-DAC02, PCM-COM422,
PCM-COM485, PCM-DMM, PCM-DAS16D/12, PCM-DAS16S/12, PCM-DAS16D/16,
PCM-DAS16S/16, PCI-DAS6402/16, Universal Library,InstaCal, Harsh Environment
Warranty and Measurement Computing Corporation are registered trademarks of Measurement
Computing Corporation.
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Notice
Measurement Computing Corporation does not authorize any
Measurement Computing Corporation product for use in life support
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Corp. products are not designed with the components required, and are
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(C) Copyright 2000, Measurement Computing Corporation
HM PCM-DAS08.lwp
TABLE OF CONTENTS
13
7 PCM-C15-10-INCH CABLE .....................................11
6 SPECIFICATIONS .............................................105.4 A/D PACER RATE SELECTION ................................. 75.3 CONTROL REGISTERS .........................................75.2 REGISTER PROGRAMMING SUPPORT ...........................75.1 CONTROL REGISTERS .........................................7
5 I/O ADDRESS MAP & REGISTER FUNCTIONS ....................64.2 PACKAGED APPLICATIONS PROGRAMS ........................64.1 PROGRAMMING LANGUAGES ..................................6
4 PROGRAMMING & APPLICATIONS .............................53.4 BEWARE OF VOLTAGE SPIKES .................................53.3 GROUND LOOP EXAMPLE ......................................43.2 CONNECTING SIGNALS TO THE ANALOG INPUTS ................33.1 CONNECTOR ..................................................3
3 INTERFACING ....................................................22.2 HARDWARE INSTALLATION ...................................22.1 SOFTWARE INSTALLATION ....................................2
2 INSTALLATION ...............................................1
1 INTRODUCTION ...............................................
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1 INTRODUCTION
The PCM-DAS08 is a data acquisition and control board for IBM PC compatible
computers with PCMCIA-type slots. The heart of the board is an analog to digital
converter. Analog signals are routed to the A/D converter via an 8:1 multiplexer
controlled by a register. The analog input range is fixed at +/-5V but the board can be
ordered in custom ranges.
A/D conversions can be triggered by an on-board pacer clock, an external pacer input,
or software polling.
Digital I/O lines (three in and three out) provide a means of sensing and controlling
discrete events.
1
2 INSTALLATION
2.1 SOFTWARE INSTALLATION
Before you open your computer and install the board, install and run InstaCal™, the
installation, calibration and test utility included with your board. Refer to the
Extended Software Installation manual for InstaCal™ installation instructions.
2.2 HARDWARE INSTALLATION
Your PCM card is completely plug and play. There are no switches or jumpers to set
prior to installation in your computer. Configuration is controlled by your systems’
PCMCIA Card and Socket Services. Simply insert the PCM-DAS08 into any
available PCM slot. Refer to the orientation guide below for proper orientation of the
card (the typical system orients the card with the label up).
Shown here is a PCM card case looking into the connector which is inserted
into the PCMCIA slot of your computer. The KEY helps to insure that the
PCM board is inserted in the correct orientation.
Figure 2-1. PCMCIA Connector
If you are using an operating system with support for Plug and Play (such as Windows
95 or 98), a dialog box will pop up upon insertion of the card indicating that new
hardware has been detected. If the information file for this board is not already loaded
onto your PC, you will be prompted for a disk containing it. The InstaCal software
that was supplied with your board contains this file. Just insert the disk or CD and
click OK.
In order to easily test your installation, it is recommended that you install InstaCal, the
installation, calibration and test utility that was supplied with your board. Refer to the
Extended Software Installation Manual for information on the initial setup, loading,
and installation of InstaCal and optional Universal Library software.
2
3 INTERFACING
The PCM-DAS08 has eight single-ended analog inputs with an analog ground, one
digital input with shared function as A/D trigger input, two digital inputs, and three
digital outputs. A digital ground is in the cable shield clips to either side of the 15
pins of the connector.
3.1 CONNECTOR
Figure 3-1 shows a PCM-DAS08 card looking into the connector. The KEY insures
that the cable is inserted correctly.
Analog signals should be connected with the high side to the numbered analog input
and the low side to the analog low level ground.
Do not connect digital signal grounds to the analog ground. Use the cable shield.
Figure 3-1. Interface Connector
3
WARNING!
Do not exceed the input specifications. There are no socketed or user serviceable
parts in a PCM board.
ANALOG INPUTS are limited to +/-15V, (unlike the higher ratings of ISA
boards).
Applying a voltage below −0.5V or greater than +5V to a DIGITAL INPUT will
burn out a transistor.
Please refer to specifications before connecting any signals.
3.2 CONNECTING SIGNALS TO THE ANALOG INPUTS
Analog inputs are single-ended. There is a single analog ground, pin 9. When
connecting multiple channels, verify that all signal grounds are at the same potential.
Connect a DVM between any two signal grounds; the reading should be 0V.
In addition to avoiding potentials between signal grounds, also avoid potentials
between signal ground and chassis ground on your computer. If you are using a
laptop and are on battery power, the computer is floating with respect to earth ground,
but if the laptop is on the charger unit or on wall power, the laptop may be grounded.
Whenever the computer is grounded, you must connect signals so there is no potential
between PC ground and signal ground. If there is a potential, it will be added to the
signal. For example, if your sensor is supplying 3.5 volts but there is a potential of
−1.5V between the PC and the sensor ground, your A/D reading will be 2.0V instead
of 3.5V.
Figure 3-2 shows a single-ended analog input connected correctly, to avoid a ground
loop and supply a clean signal to the PCM-DAS08.
Figure 3-2. Analog Input Connection
4
3.3 GROUND LOOP EXAMPLE
Figure 3-3 shows a single-ended analog input connected incorrectly. The resulting
ground loop may introduce an error to the input signal.
Figure 3-3. Incorrect Connections Causing a Ground Loop
3.4 BEWARE OF VOLTAGE SPIKES
Although your Laptop may not be grounded, that does not mean that you can connect
the PCM-DAS08 to a signal that is subject to voltage spikes. Even though the Laptop
has no reference to ground, it has more capacitive mass than the PCM-DAS08 inputs
can bear. If the signal you are measuring suddenly swings greater than +/-15V, the
weak link in the circuit will fail. That weak link is your PCM-DAS08 analog input
circuit.
This is true of any A/D board not protected by isolation amplifiers
5
4 PROGRAMMING & APPLICATIONS
Your PCM-DAS08 is now installed and ready for use. Because of the close
conformance to CIO-DAS08 register functions, many programs which work with the
CIO-DAS08 type boards will run, without modification, with the PCM-DAS08.
4.1 PROGRAMMING LANGUAGES
Universal Library provides complete access to the PCM-DAS08 functions from a
range of programming languages; both DOS and Windows. If you are planning to
write programs, or would like to run the example programs for Visual Basic or any
other language, please refer to the Universal Library manual.
4.2 PACKAGED APPLICATIONS PROGRAMS
Many packaged application programs, such as Labtech Notebook have drivers for the
PCM-DAS08. If the package you own does not appear to have drivers for the
PCM-DAS08 please fax the package name and the revision number from the install
disks. We will research the package for you and advise you on how to obtain the
correct drivers.
6
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