How do I get the DSR state property node to correctly read?

I can toggle the DTR line high and
low using a property node for the serial port, modem line settings, DTR line state, and it works fine. However, I cannot get the DSR line to
read properly. Seems to go to unasserted no matter what the input is (and I've verifed the input). I've turned handshaking on and jumpered DTR to DSR (pin 4 to 6 on DB-9), but the DSR line will not read correctly. I'm using 6.1 with Windows 2000.

Here's a simple version. Writes and reads to itself fine, and can toggle the DTR high and low. DSR is always unasserted. Thanks for your help.
Nick
Attachments:
CommProgSubset.vi ‏85 KB

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