Mark,

It has been a long time, but I seem to remember that comm 3 and 4 share the memory address of comm 1 and 2. You have to do some configuring to get around this but I don't remember what. A quick test would be to try using comm1 and 2 or comm 1 and 4 at the same time as see if that works.



>I still have a problem to get mulptiple mscomm controls to work.
>If I have 3 controls that read data from 3 different comm ports then most of the time even ports are opened OK no data gets read. Works when I use a single control. Any idea?