SerialPort on 64 bit Windows

For 64 bit, I found I needed to set:

.RtsEnable = true
.Dtsenable = true

for the serialPort

Apparently, setting the .Handshake to RequestToSend does not work.

<shrug />

Mark W.
I have a customization that writes to a serial port to stamp
nameplates. It works great in WinXP but not so much on Win 7 64. I
receive a write timeout. Odd that if I send the output to a terminal,
I do see it. So there's some combination of hardware flow control not
working. Others have seen issues with Win 7 64 but I haven't seen any
fixes.

.Net 4.0
32 bit Epicor 9.04

Thanks!!!

Mark W.