Re: Vs2005 to PDA to Rs232 interface
- From: "Paul G. Tobey [eMVP]" <p space tobey no spam AT no instrument no spam DOT com>
- Date: Mon, 10 Apr 2006 16:35:31 -0700
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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