Seems it may be the cport control not being able to send a 0.
Tech support told me: "However, I have seen some serial devices/software unable to send a value of 0, which can be problematic (a value of 0 is actually just an RS-232 start bit). "
So... cportX is not too good it seems. I am going to see if MSComm will work...
so lame... I thought I had this.
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