I am using .NET serial port class in a sequence to write and read over the COM port. Once I start Teststand 2012 and execute the sequence, it works perfect, and I can read back data successully from my COM port, however, if I try to run it again, I cannot read anything back over the COM - I would have to restart Tesstand. Attached is my Sequence. Can anyone help? I am making sure I Close() the port, and release the Object reference at Cleanup to no avail.