You probably need to learn the windows API or use the mscomm control.
Search google groups for this group and the mscomm control (assuming this is
a serial port). If not, you will have to find information for the type of
port you want to query.

http://groups.google.com/advanced_group_search?hl=en

Microsoft.public.excel.programming for the group

Search terms MScomm, serial

--
Regards,
Tom Ogilvy



"Manchi98" wrote in message
...
I am trying to use excell to track downtime in a production line and would
like to have the program count everytime a signal is received from an
input
port into the computer.

How do I have excell go outside its environment to look for that input?