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RE: Multiple serial ports for Pocket PC?
From: Carl Nilsson <
>
Date: Tue, 20 Apr 2004 08:51:33 +1000
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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>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
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<body>
<font size=3>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.<br>
Thanks, Carl<br><br>
At 02:08 AM 4/20/04, you wrote:<br><br>
</font><blockquote type=cite class=cite cite=""><font face="arial" size=2 color="#0000FF">TDK
BISM $70<br>
</font><font size=3> <br>
</font><font face="arial" size=2 color="#0000FF">Check out
<a href="http://www.tekgear.com/category.cfm?category=Bluetooth%20OEM">http://www.tekgear.com/category.cfm?category=Bluetooth%20OEM</a>
for more OEM modules that might do the trick as well.<br>
</font><font size=3> <br>
</font><font face="arial" size=2 color="#0000FF">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.<br>
</font><font size=3> <br>
</font><font face="arial" size=2 color="#0000FF">-Tony<br>
</font>
<dl>
<dd><font face="tahoma" size=2>-----Original Message-----<br>
<dd>From:</b> Carl Nilsson [<a href="mailto:" eudora="autourl">mailto:</a>] <br>
<dd>Sent:</b> Saturday, April 17, 2004 5:44 AM<br>
<dd>To:</b> <br>
<dd>Subject:</b> Re: Multiple serial ports for Pocket PC?<br><br>
</font>
<dd><font size=3>G'Day Ralf:<br>
<dd>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.<br>
<dd>Carl<br>
<dd> At 08:19 PM 4/17/04, you wrote:<br><br>
<blockquote type=cite class=cite cite="">
<dd>Hello Carl,<br><br>
<dd>thinking about your application scenario again I considered another <br>
<dd>solution that might be easiest to deploy.<br>
<dd>It uses Bluetooth - either your PDA is already equipped with it - or you <br>
<dd>may use a CF BT card.<br><br>
<dd>For your serial data sources => you may use a module that does a serial <br>
<dd>cable replacement over BT. The most compact one that I'm aware of (and <br>
<dd>that I actually use sucessfully) is a module made by TDK<br>
<dd><x-tab> </x-tab><a href="http://www.tdksystems.com/tdk_bluetooth/bluetooth_serial_module.asp" eudora="autourl">http://www.tdksystems.com/tdk_bluetooth/bluetooth_serial_module.asp</a><br><br>
<dd>Software on your PDA will let you set up multiple serial connections over <br>
<dd>Bluetooth in parallel (at least with a PDA running Linux and the Bluez BT <br>
<dd>stack). Your application on the PDA can then individually cope with the <br>
<dd>data coming from each source.<br><br>
<dd>Maybe that is an approach for you.<br>
<dd>Regards<br>
<dd> Ralf<br><br>
<dd>---------------------------------------------------------------<br>
<dd>Dr. Ralf Ackermann _ <br>
<dd>Multimedia Communications |/ | | |\/| Merckstrasse 25<br>
<dd> |\ |_| | | 64283 Darmstadt, Germany<br>
<dd>Tel.: (+49) 6151 16-6138 Fax: (+49) 6151 16-6152<br>
<dd>---------------------------------------------------------------<br>
<dd> <a href="http://www.kom.tu-darmstadt.de/~rac" eudora="autourl">http://www.kom.tu-darmstadt.de/~rac</a><br>
<dd>---------------------------------------------------------------<br><br>
<dd>--<br>
<dd>Subscription/unsubscription/info requests: send e-mail with subject of<br>
<dd>"subscribe", "unsubscribe", or "info" to <br>
<dd>Wear-Hard Mailing List Archive (searchable): <a href="http://wearables.blu.org/" eudora="autourl">http://wearables.blu.org</a><br>
<dd>Please, *PLEASE* don't subscribe through a forward/expander/false domain</blockquote><br>
<dd>Carl Nilsson<br>
<dd>137 Gordons Hill Road<br>
<dd>Lindisfarne<br>
<dd>Tasmania 7015<br>
<dd>Australia <br>
</blockquote>
<x-sigsep><p></x-sigsep>
</dl>Carl Nilsson<br>
137 Gordons Hill Road<br>
Lindisfarne<br>
Tasmania 7015<br>
Australia</font></body>
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