Re: Vs2005 to PDA to Rs232 interface

Yes, true, but how much effort will you be putting into making something
that has no value for the final application work? Of course, .NET CF 2.0
will also be supported on 4.2 devices fairly soon, in the first service
pack. Unless you really, really need something that literally is *not* in
1.0, I see no reason to start out targeting 2.0. If you target 1.0 and then
switch to 2.0 later, you get the faster XML stuff, assuming you need that,
with no cost.

Do you need the new functionality? What part?

Paul T.

"John Olbert" <someone@xxxxxxxx> wrote in message
news:68743EF1-1A46-4E6A-8E75-A4CD24699187@xxxxxxxxxxxxxxxx
DataSet.ReadXml() is fairly slow in Netcf1.0. The articles online indicate
a
significant speed improvement with Netcf2.0. Also there is some new
functionality.

Thanks.
--
John Olbert



"Paul G. Tobey [eMVP]" wrote:

So, why do you need .NET CF 2.0? Seems like 1.0 would be fine for most
things and that would allow you to use the real device immediately.

Paul T.

"John Olbert" <someone@xxxxxxxx> wrote in message
news:4DEF191F-48D9-41E4-90F1-2FC20C6ACA9E@xxxxxxxxxxxxxxxx
It sounds like this approach is either not going to work or would not
be
easy. Our problem is that the device we are using which is an
industrial
grade device (with Internet, Rs232 and Usb connections) is not due to
be
upgraded to WinCe5.0 for some time. We wanted to use Vs2005 and
Netcf2.0
which is not presently supported on this box which is still at the
WinCe4.2
level.

We wanted to get a start on developing for our target devices (they are
instruments that are used by chemists and go from Mass Spectrometers to
simple liquid valves used in Liquid Chromotography). I suspect that we
can
still use the Dell PDA to deploy to but to attempt to have a "PC--to
PDA--to
Device" link up is asking a bit much of the PDA.

Thanks for the guidance.


--
John Olbert



"Paul G. Tobey [eMVP]" wrote:

I don't quite understand what you're thinking. You're going to test
this
on
a device that can't actually be used for this in the field? The only
way
to
connect from USB to serial in your situation would be an adapter that
plugs
into the Dell and has an RS-232 on the output side. This would only
drive a
single device, of course, as RS-232 is not a bus. Also, the Dell would
have
to have a driver for that USB-to-serial device. Further, the scheme
requires that the Dell device have a *host* USB port, not just a slave
port,
like that used to connect to a PC for ActiveSync communication. The
two
ends of USB are different and operate differently. If the Dell has a
host
port, as well as the client port that it must have, that's at least
part
workable, but there are so many problems beyond that that I don't see
the
overall scheme as sensible.

USB is *not* generally daisy-chainable. You could, in theory, have a
couple
of USB hubs, each giving you four ports, say, each and plugged into
each
port you could have a USB-to-serial device. I've never tried to do
something like that, but it seems unlikely to work smoothly, but it
could,
if you can find a driver for the USB-to-serial piece for the Dell (and
if
the Dell has a USB host port), in theory work.

How many external devices are connected *at a time*? If it's one and
you're
just moving the screen-based device around to capture the data, use a
device
that has a serial port! It's so much simpler that it's not even
funny.
If
you need to connect to bunches of devices all continuously and the
central
device doesn't need to be portable, you should look at some other
Windows
CE-based device that will handle that number of serial ports. If
you're
interested, we have a unit that can handle at least 16 or 20 RS-232
ports
(they're added in groups of two or four at a time, as modules). It's
an
industrial device with no UI, but you could easily use your Dell
device
as
the UI and use network programming to send the accumulated data from
the
RS-232 'aggregator' to the Dell via 802.11 or something.
www.edasce.com.

Paul T.


"John Olbert" <someone@xxxxxxxx> wrote in message
news:376635CC-6E32-4C3C-A01B-0697488BDEE6@xxxxxxxxxxxxxxxx
In a privious reply it was indicated that a device like the Dell
Axim
X51v
PDA which supports Windows Mobile 5 could be used to deploy and test
Netcf2.0
App's written in C# using Vs2005. The device supports a Usb
connection
to
the
Pc.

What we are trying to do is use the Dell x51v as a test bed for
programs
that will be used to control analytical instruments and components.
Most
of
the latter use a Rs232 interface.

Assuming there is a device out there that will take a Usb connection
and
allow communication with a Rs232 connection, is it possible to
daisy-chain
devices on a Usb. That is, have the PC (with Vs2005) communicate
with
the
Dell X51v via its Usb and have another Usb going to the hypothetical
Usb/Rs232 box which in turn would communicate with the external
instrument?

Any suggestions would be appreciated.

--John Olbert
javo2000@xxxxxxxx

--
John Olbert









.

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