>>>>Hmmmm. Toughie. Is RThreshold on both controls set to 1 or greater? Are you sure that data is available on both ports? Is there any other code running after the first (last?) port responds? Grasping here...
>>>>
>>>>>Exactly the same. No working
>>>Here is code (INKEY(0.1)) I have added to the first INIT
>>>INKEY(0.1)
>>>This.portOpen = .t.
>>>
>>>helped big time.
>>
>>Really? "first INIT" ... whose INIT?
>The Init of the first added to the form control.

Ok. I don't know what else you might have in there, but I'd remove it all and do any adjusting/setup/opening of those ports until the FORM's INIT. By then, the controls might be ready for use ;-)