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Hello Alex,

This is a problem with the Locobuffer. Depending on how the computer
hardware deals with a unconnected signal, it can be either high or low.

I had to connect the CTS to the DSR _and_ the DCD (CD).

Anyway, I added a jumper to the Locobuffer to connect pins 5,6 & 8. It
now works nicely.


JBB


Wednesday, November 6, 2002, 10:22:12 PM, you wrote:

AS> Bob,

AS> This is starting to smell like the Java Comm API is not correctly handling
AS> the hardware handshake configuration or XP is doing something different.

AS> Looking at LocoBufferAdapter.java you appear to only be checking CTS for CTS
AS> before sending and enabling CTS handshake on open, which is what I would
AS> expect, so I wonder if Bill's boys in their wisdom have _fixed_ something in
AS> XP such that it now requires the DTR/DSR and DCD lines to also be looped.

AS> Actually come to think of it, I modified my LocoBuffer(s) to have a low
AS> value resistor linking pins 6 and 20 and I may have also linked in pin 8 as
AS> well. I did this way back when there was some discussion around being able
AS> to detect if a LocoBuffer is present by sensing DTR/DSR. I think some people
AS> were pretty adament about it being a necessity for good software design and
AS> robustness etc.

AS> I will have to check when I get home, but that may explain why my units at
AS> least have continued to work fine all this time even if a subtle change has
AS> crept in.

AS> Can anyone confirm is these problems have only surfaced on Windows XP or are
AS> they not Windows version specific?

AS> I'm on Win2K

AS> Alex