RE: Multiple serial ports for Pocket PC?

From: "Tony Havelka" <
>
Date: Mon, 19 Apr 2004 11:08:36 -0500

This is a multi-part message in MIME format.

------=_NextPart_000_0141_01C425FE.ADF211A0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

TDK BISM $70
=20
Check out http://www.tekgear.com/category.cfm?category=3DBluetooth%20OEM =
for
more OEM modules that might do the trick as well.
=20
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.
=20
-Tony

-----Original Message-----
From: Carl Nilsson [mailto:]=20
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=20
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 =3D> you may use a module that does a =
serial=20
cable replacement over BT. The most compact one that I'm aware of (and=20
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=20
Bluetooth in parallel (at least with a PDA running Linux and the Bluez =
BT=20
stack). Your application on the PDA can then individually cope with the=20
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
<http://wearables.blu.org/>=20
Please, *PLEASE* don't subscribe through a forward/expander/false domain

Carl Nilsson
137 Gordons Hill Road
Lindisfarne
Tasmania 7015
Australia=20

------=_NextPart_000_0141_01C425FE.ADF211A0
Content-Type: text/html;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Dus-ascii">
<TITLE>Message</TITLE>

<META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR></HEAD>
<BODY>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D106085415-19042004>TDK=20
BISM $70</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D106085415-19042004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D106085415-19042004>Check=20
out <A=20
href=3D"http://www.tekgear.com/category.cfm?category=3DBluetooth%20OEM">h=
ttp://www.tekgear.com/category.cfm?category=3DBluetooth%20OEM</A> fo=
r=20
more OEM modules that might do the trick as well.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D106085415-19042004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D106085415-19042004>Remember that the Bluetooth SPP Profile will =
only=20
support a certain number of concurrent Serial Connections.  I =
believe the=20
limit is 4 concurrent connections with 7 devices that can be =
discovered. =20
This means that there is a limit to how many devices you can poll at one =
time.=20
If you want to poll a different device that is not in your list of 4 =
active=20
devices, you software has to drop one of the connections and pair up =
with the=20
new device you want to poll.  Keep this in mind when selecting =
Bluetooth as=20
an alternative to wired connections.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D106085415-19042004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D106085415-19042004>-Tony</SPAN></FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV></DIV>
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
  face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B> Carl =
Nilsson=20
  [mailto:] <BR><B>Sent:</B> Saturday, April 17, =
2004 5:44=20
  AM<BR><B>To:</B> <BR><B>Subject:</B> Re: Multiple =
serial=20
  ports for Pocket PC?<BR><BR></FONT></DIV><FONT size=3D3>G'Day =
Ralf:<BR>Thanks=20
  for your considered replies.  I'm using an iPAQ h 2115 at the =
moment=20
  which does have Bluetooth.   Haven't tried it yet and I'm a =
bit wary=20
  of possible interference from airport radar etc in an aircraft and=20
  interference to other devices in the aircraft, but it is certainly =
worth=20
  looking into.   Don't know till you try things.   =
Thanks=20
  for the TDK suggestion  - depends on price.  I would need =
one of=20
  these adapters for each device.<BR>Carl<BR> At 08:19 PM 4/17/04, =
you=20
  wrote:<BR><BR>
  <BLOCKQUOTE class=3Dcite cite=3D"" type=3D"cite">Hello =
Carl,<BR><BR>thinking about=20
    your application scenario again I considered another <BR>solution =
that might=20
    be easiest to deploy.<BR>It uses Bluetooth - either your PDA is =
already=20
    equipped with it - or you <BR>may use a CF BT card.<BR><BR>For your =
serial=20
    data sources =3D> you may use a module that does a serial =
<BR>cable=20
    replacement over BT. The most compact one that I'm aware of (and =
<BR>that I=20
    actually use sucessfully) is a module made by=20
    =
TDK<BR><X-TAB>        </X-TAB><A =

    =
href=3D"http://www.tdksystems.com/tdk_bluetooth/bluetooth_serial_module.a=
sp"=20
    =
eudora=3D"autourl">http://www.tdksystems.com/tdk_bluetooth/bluetooth_seri=
al_module.asp</A><BR><BR>Software=20
    on your PDA will let you set up multiple serial connections over=20
    <BR>Bluetooth in parallel (at least with a PDA running Linux and the =
Bluez=20
    BT <BR>stack). Your application on the PDA can then individually =
cope with=20
    the <BR>data coming from each source.<BR><BR>Maybe that is an =
approach for=20
    =
you.<BR>Regards<BR> Ralf<BR><BR>------------------------------------=
---------------------------<BR>Dr.=20
    Ralf=20
    =
Ackermann          &nbs=
p;=20
    _        =20
    <BR>Multimedia Communications |/ | |=20
    |\/|          =20
    Merckstrasse=20
    =
25<BR>           &=
nbsp;           &n=
bsp; =20
    |\ |_| |  |  64283 Darmstadt, Germany<BR>Tel.: (+49) 6151=20
    =
16-6138           =
    =20
    Fax: (+49) 6151=20
    =
16-6152<BR>--------------------------------------------------------------=
-<BR>           &n=
bsp;=20
    <A href=3D"http://www.kom.tu-darmstadt.de/~rac"=20
    =
eudora=3D"autourl">http://www.kom.tu-darmstadt.de/~rac</A><BR>-----------=
----------------------------------------------------<BR><BR>--<BR>Subscri=
ption/unsubscription/info=20
    requests: send e-mail with subject of<BR>"subscribe", "unsubscribe", =
or=20
    "info" to <BR>Wear-Hard Mailing List =
Archive=20
    (searchable): <A href=3D"http://wearables.blu.org/"=20
    eudora=3D"autourl">http://wearables.blu.org</A><BR>Please, *PLEASE* =
don't=20
    subscribe through a forward/expander/false =
domain</BLOCKQUOTE><X-SIGSEP>
  <P></X-SIGSEP>Carl Nilsson<BR>137 Gordons Hill =
Road<BR>Lindisfarne<BR>Tasmania=20
  7015<BR>Australia</FONT> </P></BLOCKQUOTE></BODY></HTML>

------=_NextPart_000_0141_01C425FE.ADF211A0--

--
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
+Previous Message in Thread | Next Message in Thread
From Wear-Hard Mailing list Archive (WH)
Maintained by R. Paul McCarty
Archive created with babymail