RE: Serial Port busy.

[Christian Rudolph - WorkGroup Layered Software <Christian.Rudolph@East>]

I have an Ultra1, and I have found the same situation.
I am unable to get any reliable results with a port
speed faster than 38400.  I have talked to engineers
here in the Systems QA lab who test this, and they
pretty much agree with what Bharat says.  Basically,
Sun has not really made any effort to make sure that
high port speed rates can be achieved higher than
38400. This is what I am told.  I don't know whether
this is true or not, but it explains things.

-Chris




 :From: "Bharat Mediratta" <bmedirat@xxxxxxxxxxxxxx>
 :To: pilotmgr@xxxxxxxxxxxxxxxxxxxxxxx
 :Subject: RE: Serial Port busy.
 :MIME-Version: 1.0
 :
 :
 :
 :Once upon a time, a kindly hardware engineer explained this
 :to me.  Because of the clock rates, what Sun boxes (up to an
 :Ultra 2 at the time -- I don't know if it applies to boxes
 :later than that) represent as 57600 is actually something in
 :the ~52000 range.  This is because of a difference in clock
 :rates.  Feel free to correct me if I'm wrong here.  So two
 :Suns can talk to each other at "57600" and above, but you
 :can't talk to another component that is actually talking at
 :57600.  The best rate I was ever able to use was 38400.
 :
 :-Bharat
 :
 :
 :> -----Original Message-----
 :> From: Rama Roberts [mailto:Rama.Roberts@xxxxxxxxxxx]
 :> Sent: Friday, March 19, 1999 11:27 AM
 :> To: Gilbert.Dunn@xxxxxxxxxxx
 :> Cc: pilotmgr@xxxxxxxxxxxxxxxxxxxxxxx
 :> Subject: Re: Serial Port busy.
 :> 
 :> 
 :> I don't know the answer to your busy serial port, but I've 
 :> been using 38400 with 
 :> my sparc ultra 2. PCs can go much faster, older sparcs might 
 :> need to go slower, 
 :> depending on the model. Old sparc serial ports were real slow 
 :> from what I've 
 :> heard.
 :> You can just keep bumping up the speed until it no longer 
 :> makes the connection. 
 :> That's how I determined my max speed.
 :> 
 :> --rr
 :> 
 :> > Date: Fri, 19 Mar 1999 10:58:16 -0800 (PST)
 :> > From: Gilbert Dunn <Gilbert.Dunn@xxxxxxxxxxx>
 :> > Subject: Serial Port busy.
 :> > To: pilotmgr@xxxxxxxxxxxxxxxxxxxxxxx
 :> > MIME-Version: 1.0
 :> > Content-MD5: quwcUZDijuTvQAwH+B2xQw==
 :> > 
 :> > Hi,
 :> > 
 :> > I had my Palm III pilot configued to /dev/ttyb 9600. 
 :> Everthing was working 
 :> fine 
 :> > until my co-worker wanted to see if he can Sync his PalmV. 
 :> After it failed, I 
 :> > plugged my Palm III back to /dev/ttyb. Now, I cannot sync 
 :> and I'm getting 
 :> these 
 :> > messages. I've already rebooted my system and its still 
 :> telling me the port is 
 :> > in use. By the way, if I get this working again, what the 
 :> fast setting could I 
 :> > set for the serial port?
 :> > 
 :> > Thanks,
 :> > 
 :> > Gilbert
 :> > 
 :> > 
 :> > Palm III error message
 :> > ----------------------
 :> > [HotSyncPorblem]
 :> > Unable to initiate HotSync because the serial port is in 
 :> use by another 
 :> > application.
 :> > 
 :> > PilotManager,v1.106+ error message
 :> > ----------------------------------
 :> > Unable to connect to the Pilot.  Sync aborted.
 :> > 
 :> > 
 :> > 
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 :> 
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