Technical information

V4 Logger73

John Brunson, Chief Engineer at Troy State University has noted that the

internal computer power supply provides a very solid +5, +12 volt source

thus eliminating the requirement for an external supply when using

output closures. A small wire extension from an open plug or the

purchase of a Molex plug with extension wires allows for quick and easy

connection to a 5 or 12 volt source. The external pins receive power the

same time as the computer is starting so the power and card are always

in sync. This also prevents accidentally applying power externally to the

card while the computer is running which can cause damage in some

instances.

The output closures when configured as “Hi” or “Source” will provide a

logic high when inactive and a logic low when active. When the SIPS are

configured for “Low” or “Sink”, the output will show a logic low when

inactive and logic high when active. The three ports are clearly labeled on

the DIO card with Hi and Low at each end of the SIP socket.

You can test your cards input/output functions from the “Test” tab on the

main page of the InstaCal program. Placing a jumper across B0,C0;

B1,C1;, etc. and selecting “Test” for the corresponding pair that you have

wired together will verify the connection is made electrically and eliminate

a great deal of guesswork when trouble shooting.

Once we have verified all closures are working on the card, we are now

ready to configure the Logger software for use with the DIO – 24H card.

In Logger, go to “Tools” then “Configure”