BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  parallel port can't read new value.          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Andrew McIsaac Guest Posted: Sun Oct 09, 2005 9:12 am    Post subject: parallel port can't read new value. Hi, I am uing BCB5 Pro & Win98SE/XP Created an app that uses the parallel port. I can write to the port, and I can read what was sent. Problem is if there is a change in status of one of the pins, ie. I physically put a pin high, this change is not read. Is there a command to make the port read the actual values. Program Im using for ports is from Logix4u.net Thanks in Advance Andrew Back to top Bob Gonder Guest Posted: Sun Oct 09, 2005 4:14 pm    Post subject: Re: parallel port can't read new value. Andrew McIsaac wrote: Quote: Problem is if there is a change in status of one of the pins, ie. I physically put a pin high, this change is not read. Is there a command to make the port read the actual values. Program Im using for ports is from Logix4u.net The parallel port runs on a strobe signal. I forget which pin it is. The data is presented to the data pins, then the stobe sends the data. It is not enough to change a data pin. If you hold a pin high while the program is sending data, you should see that bit remain constant. Back to top Andrew McIsaac Guest Posted: Mon Oct 10, 2005 8:54 pm    Post subject: Re: parallel port CAN now read new value. Thanks to Bob Gonder for getting me in the right direction. Solved by using the Data and Status Port. Thank you. 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