Return to the archive index

RE: Multiple serial ports for Pocket PC?

I haven't been tracking the thread too closely.  Has anyone mentioned
the USB multiport serial hubs that can be had?  I've seen 2, 4, 8, ...,
128 port solutions running off of a single USB port.  This and a PCMCIA
to USB 2.0 card might work for you.

-Freeman

On Mon, 2004-04-19 at 16:51, Carl Nilsson wrote:
> I haven't checked out this yet.  I presume you are telling me that TDK
> make a Bluetooth  ... Serial Module (BISM ?) for $70.   That's getting
> closer to the mark, but the problem there is each serial line needs
> one so I am up for, say, 4 X $70.   Not out of the question.  I
> appreciate the info on Bluetooth, about which I know next to nothing. 
> I also know that I should look into it soon!   A mixed approach might
> be to use a PIC microprocessor or two to collect all the serial lines
> running at 9600 baud or less, put them out as one serial stream and
> then use a BISM or two.
> Thanks, Carl
> 
> At 02:08 AM 4/20/04, you wrote:
> 
> > TDK BISM $70
> >  
> > Check out
> > http://www.tekgear.com/category.cfm?category=Bluetooth%20OEM for
> > more OEM modules that might do the trick as well.
> >  
> > Remember that the Bluetooth SPP Profile will only support a certain
> > number of concurrent Serial Connections.  I believe the limit is 4
> > concurrent connections with 7 devices that can be discovered.  This
> > means that there is a limit to how many devices you can poll at one
> > time. If you want to poll a different device that is not in your
> > list of 4 active devices, you software has to drop one of the
> > connections and pair up with the new device you want to poll.  Keep
> > this in mind when selecting Bluetooth as an alternative to wired
> > connections.
> >  
> > -Tony
> > 
> > 
> >         -----Original Message-----
> >         
> >         From: Carl Nilsson [mailto:] 
> >         
> >         Sent: Saturday, April 17, 2004 5:44 AM
> >         
> >         To: 
> >         
> >         Subject: Re: Multiple serial ports for Pocket PC?
> >         
> >         
> >         G'Day Ralf:
> >         
> >         Thanks for your considered replies.  I'm using an iPAQ h
> >         2115 at the moment which does have Bluetooth.   Haven't
> >         tried it yet and I'm a bit wary of possible interference
> >         from airport radar etc in an aircraft and interference to
> >         other devices in the aircraft, but it is certainly worth
> >         looking into.   Don't know till you try things.   Thanks for
> >         the TDK suggestion  - depends on price.  I would need one of
> >         these adapters for each device.
> >         
> >         Carl
> >         
> >          At 08:19 PM 4/17/04, you wrote:
> >         
> >         >         Hello Carl,
> >         >         
> >         >         
> >         >         thinking about your application scenario again I
> >         >         considered another 
> >         >         
> >         >         solution that might be easiest to deploy.
> >         >         
> >         >         It uses Bluetooth - either your PDA is already
> >         >         equipped with it - or you 
> >         >         
> >         >         may use a CF BT card.
> >         >         
> >         >         
> >         >         For your serial data sources => you may use a
> >         >         module that does a serial 
> >         >         
> >         >         cable replacement over BT. The most compact one
> >         >         that I'm aware of (and 
> >         >         
> >         >         that I actually use sucessfully) is a module made
> >         >         by TDK
> >         >         
> >         >                 http://www.tdksystems.com/tdk_bluetooth/bluetooth_serial_module.asp
> >         >         
> >         >         
> >         >         Software on your PDA will let you set up multiple
> >         >         serial connections over 
> >         >         
> >         >         Bluetooth in parallel (at least with a PDA running
> >         >         Linux and the Bluez BT 
> >         >         
> >         >         stack). Your application on the PDA can then
> >         >         individually cope with the 
> >         >         
> >         >         data coming from each source.
> >         >         
> >         >         
> >         >         Maybe that is an approach for you.
> >         >         
> >         >         Regards
> >         >         
> >         >          Ralf
> >         >         
> >         >         
> >         >         ---------------------------------------------------------------
> >         >         
> >         >         Dr. Ralf Ackermann            _        
> >         >         
> >         >         
> >         >         Multimedia Communications |/ | | |\/|          
> >         >         Merckstrasse 25
> >         >         
> >         >                                   |\ |_| |  |  64283
> >         >         Darmstadt, Germany
> >         >         
> >         >         Tel.: (+49) 6151 16-6138                Fax: (+49)
> >         >         6151 16-6152
> >         >         
> >         >         ---------------------------------------------------------------
> >         >         
> >         >                      http://www.kom.tu-darmstadt.de/~rac
> >         >         
> >         >         ---------------------------------------------------------------
> >         >         
> >         >         
> >         >         --
> >         >         
> >         >         Subscription/unsubscription/info requests: send
> >         >         e-mail with subject of
> >         >         
> >         >         "subscribe", "unsubscribe", or "info" to
> >         >         
> >         >         
> >         >         Wear-Hard Mailing List Archive (searchable):
> >         >         http://wearables.blu.org
> >         >         
> >         >         Please, *PLEASE* don't subscribe through a
> >         >         forward/expander/false domain
> >         
> >         
> >         Carl Nilsson
> >         
> >         137 Gordons Hill Road
> >         
> >         Lindisfarne
> >         
> >         Tasmania 7015
> >         
> >         Australia 
> 
> Carl Nilsson
> 137 Gordons Hill Road
> Lindisfarne
> Tasmania 7015
> Australia

--
Subscription/unsubscription/info requests: send e-mail with subject of
"subscribe", "unsubscribe", or "info" to 
Wear-Hard Mailing List Archive (searchable): http://wearables.blu.org
Please, *PLEASE* don't subscribe through a forward/expander/false domain

From Wear-Hard Mailing list Archive (WH)
Maintained by R. Paul McCarty

Archive created with babymail