AVR-Chat

I like David's remarks, but has anyone else gotten 5
(and counting) copys as I have?

Jeff Engel
Arlington, TX
--- David Kelly <dkelly@hiwaay.net> wrote:

> 
> On Fri, Feb 25, 2005 at 10:12:30AM -0500, Phillip
> Vogel wrote:
> > 
> > In the simplest setting, you just use the drivers
> from ftdi, and the device
> > looks like a com port on the PC. On the
> microcontroller end, it's an async
> > serial device. Just hook it up to the tx & rx pins
> of your uart, set the
> > baud rate accordingly, and it's running. Really
> couldn't be much simpler. 
> > 
> > Also, you may want to look at the modules from
> Lynx, which have the ftdi
> > chip and all the glue in a 16 pin hand-solderable
> package. Just add a USB
> > connector and you're good to go.
> 
> USB is the latest hot stuff and all that, and I
> admit that I'm not
> paying full attention, but am a bit surprised not to
> see mention of
> EIA/TIA-485. Its as simple as RS-232.
> 
> With any solution you'll have to devise a method of
> addressing the
> specific unit out of the 16 proposed. Suspect via
> USB they will appear
> in random order as pseudo-COM ports. Doubt you wish
> to code a full
> Modbus protocol (http://www.modbus.org/) but the
> basics of a half duplex
> one master many slaves are described in their
> documentation.
> 
> Some AVR boards such as the MAVRIC-II come with 485
> hardware.
> 
> Ultra-cheap amateur radio operators used to build
> similar "diode matrix"
> switches for AX.25 TNCs with common RS-232
> interfaces. "It worked" was
> the best one could say of that solution. Didn't
> scale well. Doubt it
> would scale to 16 nodes.
> 
> -- 
> David Kelly N4HHE, dkelly@HiWAAY.net
>
========================================================================
> Whom computers would destroy, they must first drive
> mad.


=====
Happiness is - positive intake manifold pressure.


		
__________________________________ 
Do you Yahoo!? 
Take Yahoo! Mail with you! Get it on your mobile phone. 
http://mobile.yahoo.com/maildemo