Re: Com ports & environment space
- Posted by David Gay <moggie at INTERLOG.COM> Oct 26, 1996
- 1716 views
> Many users have no idea what com port their modem is on. I would > like my installer to be able to look for a modem (issue an ati > command and see if there is a response). The E. doc for open > says I can open COM1 (I presume I can open COM 2 3 & 4). > I am looking for any hints on how to get started. Can I just > puts and gets to & from a COM port, or do I have to worry about > single spacing the characters. Can I work with the IRQs? Hi John Yes, you can open COM2-COM4 as well. You can determine what COMx ports are open by simply issuing an open() first and seeing if you get a -1 returned for a failed open. To see what COMx port the modem is set, simply issuing an ATZ to any of the COMx ports that return a positive file handle number and reading back an OK string will work. I recommend you open the com port as a binary file, using both a combination of strings and single character output. Hope this helps. David