Measurement-computing Daq PC-Card Manuel d'utilisateur télécharger pdf (Page 53)

DaqBook/DaqBoard/Daq PC-Card User’s Manual

05-11-00

Daq* Hardware 3-23

Daq/112B and Daq/216B PC-Cards

The Daq PC-Card for notebook PCs complies with PC Card Standard Specification 2.1, PCMCIA Type II

(5mm) compatible. The Daq/112B and Daq/216B provide 12- or 16- bit, 100 kHz data acquisition via

8 differential or 16 single-ended analog inputs. A variety of signal-conditioning, expansion, and software

options are available. The Daq PC-Card connects to DBK cards and modules that support the DB37 (P1)

connector.

Input power for the Daq PC-Card comes from the host computer. No output power is available. Thus,

power for DBKs must be provided by a CDK10. A CDK10 expansion chassis also has two card slots to

hold DBKs. For expansion, the DBK41 (10-Slot Chassis) or DBK60 (3-Slot Chassis with Termination

Panels) with the DBK32A or DBK33 can be used for multiple DBK Cards.

The on-board 512-location scan sequencer allows you to select any channel and gain to scan different types

of transducers, from thermocouples to strain gauges, within the same scan group without a software slow

down. The sequencer scans at a 10 µs/channel rate and can be programmed to repeat a sequence at

intervals from 10 µs to 10 hr. Optional simultaneous sample and hold cards can sample up to 256 channels

at the same instant. Scanning and timing specifications are met even with a full complement of expansion

modules (maximum of 256 input channels).

The Daq PC-Card includes DOS-based client software that is compatible with PCMCIA Card Services

Specification 2.1. This software allows easy insertion and removal into any Type II socket with automatic

configuration on insertion for DOS and Windows 3.x. (CardSoft™ Card and Socket Services are available

on most notebook PCs or from various sources. If using Windows 95/98/ME, the installation disk has a

configuration file and does not require additional PCMCIA software.)

The figure shows the Daq PC-Card block diagram.

8 DE/16 SE

analog input

multiplexer

Sample &

hold amplifier

100 kHz

clock

12 or 16-bit,

100 kHz

analog to digital

converter

512-step

random access

channel/gain

sequencer

PCMCIA

Interface

8-bit

data &

address

bus

Programmable

gain am plifier

×1,2,4,8

4 general purpose

digital inputs

External clock gate

1 TTL trigger input

2 gain select outputs for

expansion boards

4 digital outputs

for high-speed

channel expansion

4 general purpose

digital outputs

2K word

FIFO

data

buffer

ANALOG I/O

via optional

cable

CA-134

DB37

(DAS-16

compatible)

Signal

I/O

Sequencer

reset

External

MUX

Control

MUX

Gain select

per channel

Programmable

sequencer timebase,

10 s to 167s

SE/DE

selection

Bipolar

Daq PC-Card Block Diagram

Configuration

The Daq PC-Card does not require hardware configuration. No jumpers, no switches—all configuration

occurs in software. You will have to install the software before performing the configuration.

Note: You may need to set jumpers in your DBKs or other system components.

I/O Configuration

Data is transferred to the host computer via the PCMCIA interface. This interface provides access to the

PC’s data bus, allowing real-time data collection and storage to disk at 100 K readings/s. The built-in

512-word FIFO prevents data loss. Two data transfer modes are supported:

•

The programmed I/O mode allows the computer to acquire individual data samples or large blocks of

data under application control.

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Measurement-computing Daq PC-Card Manuel d'utilisateur Page 53

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