Programming & Applications; Programming Languages; Packaged Applications Programs - Measurement Computing PC-CARD-DAC08 User Manual

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

TM
Many packaged application programs, such as SoftWIRE , 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.
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