Measurement Computing PC-CARD-DAC08 User manual

PC-CARD-DAC08

Analog Outputs & Digital I/O

User’s Manual

Revision 1

March, 2001

ht 2001, Measurement Computin

Corporation

MEGA-FIFO, the CIO prefix to data acquisition board model numbers, the PCM prefix to data

acquisition board model numbers, PCM-DAS08, PCM-D24C3, PC-CARD-DAC08,

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.

IBM, PC, and PC/AT are trademarks of International Business Machines Corp. Windows is a

trademark of Microsoft Corp. All other trademarks are the property of their respective owners.

Information furnished by Measurement Computing Corp. is believed to be accurate and

reliable. However, no responsibility is assumed by Measurement Computing Corporation

neither for its use; nor for any infringements of patents or other rights of third parties, which

may result from its use. No license is granted by implication or otherwise under any patent or

copyrights of Measurement Computing Corporation.

or transmitted, in any form by any means, electronic, mechanical, by photocopying, recording

or otherwise without the prior written permission of Measurement Computing Corporation.

Notice

Measurement Computing Corporation does not authorize any

Measurement Computing Corporation product for use in life support

systems and/or devices without the written approval of the President of

Measurement Computing Corporation Life support devices/systems are

devices or systems which, a) are intended for surgical implantation into

the body, or b) support or sustain life and whose failure to perform can

be reasonably expected to result in injury. Measurement Computing

Corp. products are not designed with the components required, and are

not subject to the testing required to ensure a level of reliability suitable

for the treatment and diagnosis of people.

HM PC-CARD-DAC08.lwp

TABLE OF CONTENTS

6 SPECIFICATIONS .................................................6

5 I/O ADDRESS MAP & REGISTER FUNCTIONS ......................54.2 PACKAGED APPLICATIONS PROGRAMS ........................54.1 PROGRAMMING LANGUAGES .................................5

4 PROGRAMMING & APPLICATIONS ...............................43.6 DIGITAL INPUTS & OUTPUTS ..................................43.5 EXTERNAL INTERRUPT INPUT .................................43.4 SIGNAL CONNECTION ........................................43.3 OUTPUT VOLTAGE RANGE ....................................43.2 CONNECTING DEVICES TO THE ANALOG OUTPUTS .............33.1 PC-CARD-DAC08 CONNECTOR .................................3

3 INTERFACING ....................................................22.2 INSTALL THE PC-CARD .......................................22.1 SOFTWARE ...................................................2

2 INSTALLATION ..................................................1

1 INTRODUCTION ..................................................

This page is blank.

1 INTRODUCTION

The PC-CARD-DAC08 is an eight-channel, analog output control board for IBM PC

compatible computers having PCMCIA-type slots. The heart of the board is an octal,

13-bit digital-to-analog converter of which only 12 bits are used for each output.

Analog voltage signals are generated by the D/A from registers. Control of I/O

operations is done by the Field Programmable Gate Array (FPGA) on the board

(Figure 1-1). Double-buffering of the output registers permit simultaneous output

changes.

Range of the analog outputs is bipolar, ±5V.

In addition to the analog outputs, there are eight bi-directional digital I/O lines

arranged in two, 4-bit ports. They provide the capability of sensing and controlling

discrete events (via external signal-conditioning hardware). The ports can be

programmed to be either eight inputs, eight outputs, or four inputs and four outputs.

Figure 1-1. PC-CARD-DAC08 Block Diagram

PCMCIA BUS CONNECTOR P1

(

68-PIN

)

ADDRESS

BUS

HOST BUS ADAPTER

CONTROLLER

FPGA

P2 CONNECTOR (26 PIN)

PC-CARD-DAC08

DIGITAL

I/O

PORT

4 BITS

DIGITAL

I/O

PORT

4 BITS

ATTRIBUTE

MEMORY

DATA

BUS

OCTAL D/A

CONVERTER

13-BIT D/A OUT 7: 0

DIG I/O 3: 0

DIG I/O 7: 4

EXT INT

2 INSTALLATION

2.1 SOFTWARE

Your PCM card is completely plug and play. There are no switches or jumpers to set

prior to installation in your computer. InstaCal is the installation, calibration and test

software supplied with the board. Refer to the Extended Software Installation Manual

to install InstaCal.

2.2 INSTALL THE PC-CARD

Follow the steps below to install your PC-Card.

1. Insert the card into a free PC Card/PCMCIA type II or III slot. You do not

have to turn the computer off. The system is designed for power-on

installation.

2. If the appropriate driver is already loaded on the PC, the card should be

detected, recognized, and configured by Windows and you should hear an

insertion beep. If the card is not detected by Windows, go to step 3. To

verify the card has been recognized, go to Control Panel\System\Device

Manager and the card should now appear under "DAS Component."

3. If the drivers are not already loaded on the PC, you will be prompted for a

driver. If you are not prompted for a driver after inserting the card, go to Step

4. The appropriate driver is located on disk 1 of the installation disk set.

Insert this disk. Windows should detect the driver file automatically, install it

and then the card should be detected by Windows and you should hear an

insertion beep. To verify the card has been recognized, go to Control

Panel\System\Device Manager and the card should now appear under "DAS

Component." If your card appears in the list you can now proceed to the

"RUN InstaCal" section of this manual.

4. If the card is not detected by Windows and you are not prompted for a driver

after inserting the card, check that your computer's 32-bit PCMCIA drivers

are enabled. If they are not, enable them and then restart your computer and

try the above procedure again.

3 INTERFACING

The PC-CARD-DAC08 connector has eight, single-ended analog outputs, one

interrupt input, eight, digital inputs/outputs and eight ground pins. A chassis ground is

in the cable shield clips to either side of the 26 pins of the connector.

3.1 PC-CARD-DAC08 CONNECTOR

Figure 3-1 shows a PC-CARD-DAC08 case looking into the male mini-connector.

The connector is mechanically keyed to insure that the cable is inserted correctly.

Figure 3-1. 26-Pin I/O Mini-Connector

Table 3-1. 26-Pin Connector Pinout

D/A OUT 726GND13 D/A OUT 625GND12 D/A OUT 524GND11 D/A OUT 423GND10 D/A OUT 322GND9D/A OUT 221GND8D/A OUT 120GND7D/A OUT 019PC +5V OUT6DIGITAL I/O 718DIGITAL I/O 65DIGITAL I/O 517DIGITAL I/O 44DIGITAL I/O 316DIGITAL I/O 23DIGITAL I/O 115DIGITAL I/O 02EXT. INTERRUPT IN14GND1SIGNAL NAMEPINSIGNAL NAMEPIN

Analog devices to be controlled should be connected with the high side to the

numbered analog output and the low side to an adjacent ground.

Refer to Section 7, Specifications, for information on a mating cable,

PC-CARD-C37F/26. This cable will permit attachment to a variety of screw terminal

and signal conditioning boards. The PC-CARD-DAC08 used in conjunction with the

PC-CARD-C37F/26 cable is pin compatible with the PCM-DAC08 using the

PCM-C37/33 cable.

3.2 CONNECTING DEVICES TO THE ANALOG OUTPUTS

The analog outputs are single-ended. You must 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 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 card is supplying 3.5 volts and there is a potential of

-1.5V between the PC and the sensor ground, your device under control will be

reading 2.0V instead of 3.5V

3.3 OUTPUT VOLTAGE RANGE

There is only one output voltage range, ±5VDC.

3.4 SIGNAL CONNECTION

Loads drawing higher currents than the maximum current specified in the electrical

spec will cause the analog output to drop, meaning that a code of 4095 will not be able

to generate a full scale voltage of 5V, but somewhat less.

3.5 EXTERNAL INTERRUPT INPUT

Pin 14 on the 26 pin I/O mini-connector is an external input which will generate an

interrupt to the computer. The interrupt must be enabled through software. The

interrupt is falling edge triggered using TTL level signals. The procedure initiated by

an interrupt is wholly dependent on programming.

3.6 DIGITAL INPUTS & OUTPUTS

The PC-CARD-DAC08 has eight bi-directional digital I/O lines. The eight digital

lines can be programmed as input or output in groups of: eight inputs, eight outputs or

four inputs and four outputs. A register controls the direction of the digital I/O lines

and must be set via software. At power-on or reset, the digital lines are set as inputs.

Please note: Digital lines in an input state present a high impedance to any device

connected to them. The implication of this is that if you are using a digital line to

control the input of a TTL chip, and that digital line changes from an output to an

input, the TTL chip being controlled may detect the turned around line as a “1” or a

“0”. This could cause the TTL input being controlled to switch on or off, possibly

causing bad consequences for the system you are controlling. To prevent random

switching and force all digital lines into a known state on power up or reset, use pull

-up or pull-down resistors to fix the state of the line as either high or low. A properly

selected resistor will not interfere with TTL level output signals.

For more information on programming the digital I/O lines, please refer to the

Universal library programmers manual.

4 PROGRAMMING & APPLICATIONS

4.1 PROGRAMMING LANGUAGES

Universal Library provides complete access to the PC-CARD-DAC08 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 turn now to the Universal library manual.

4.2 PACKAGED APPLICATIONS PROGRAMS

Many packaged application programs, such as SoftWIRETM, have drivers for the

PC-CARD-DAC08. If the package you own does not appear to have drivers you need,

please fax the package name and the revision number from the install disks. We will

research the package for you and advise by return fax how to obtain necessary drivers.

5 I/O ADDRESS MAP & REGISTER FUNCTIONS

A base address register controls the beginning, or 'Base Address' of the I/O addresses

occupied by the control registers of the PC-CARD-DAC08. Sixteen addresses are

allocated to the PC-CARD, however, only 5 addresses are actually used. The base

address assigned by CSS is stored in the CB.CBG file by InstaCal.

After CSS is installed and a base address has been established, the PC-CARD-DAC08

is controlled by writing to and reading from the control registers. While it is possible

to write your own control routines, routines have been written and are available in

Universal library for DOS and Windows programming languages. We support the use

of the PC-CARD-DAC08 through high level languages using Universal Library.

All I/O access can be performed as bytes or words. Eight-bit addressing is controlled

by the CSS, which is currently set for 8-bit addressing. The registers are presented in

8-bit format here.

BASE + 0 - DAC0 LSB Data Register

D/A0D/A1D/A2D/A3D/A4D/A5D/A6D/A7 01234567

Any read to this register triggers an D/A conversion. This is a good method of starting

conversions from software or time of day clock control.

WRITE: D/A Data can be written to this address and to Base + 1 to form a 12-bit

D/A data word. All eight DAC’s are updated using this register. The DAC

being updated is set via the Select bits (S3 to S0) in the Base +2 register.

READ: Starts a D/A conversion. Updates the output of the selected DACs in Base

+ 2 Register.

BASE + 1 - DAC Value MSB (4 bits)

D/A8D/A9D/A10D/A11D/A12XXX 01234567

WRITE: Send DAC data.

READ: Clear Interrupt Request bit at Base +4 bit D#3

BASE + 2 - DAC Select Register

S0S1S2S3CLRXXX 01234567

WRITE: Select the DAC to update

READ: Read back Currently Selected DAC

S2: S0: The data entered to registers base +0 and base +1 will be latched to the

DAC register defined by these bits (see table 5-1).

Table of contents

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