Re: Null-Modem serial-to-USB cable

["Nicholas Bodley" <user=1375@nabble.blu.org>]

 On Thu, 03 Apr 2008 20:25:20 -0400, Tom Metro <[hidden email]> wrote: 

>  Here's an "open source" USB to RS232 adapter: 
>  http://www.embedded-projects.net/index.php?page_id=165

> I don't know if it has a working DTR line, but it ought to have adequate   
> documentation of the hardware to permit answering that question, and a   
> support community. 

I took a look at the schematic ("Schaltplan" in German, I conclude) for   
the higher-numbered version, and it doesn't seem to have more than serial   
data input and output. However, PD6 and PD7 on the embedded µP seem not to   
be assigned, and any good hacker should be able to adapt the board to make   
DTR wiggle. (I can't figure out for sure whether SV2 is the RS-232   
connector, but nothing else seems to be.) 

The organization seems to encourage writing of more driver firmware; they   
might reply about adding a DTR output. (If you're careful of static and   
such, you might well use PD6 or PD7 directly connected to whatever you   
wanted DTR to wiggle.) 

One US company that is (imho) inspiring, heavily "into" embedded   
microprocessors and some related hardware is Sparkfun: 
<http://www.sparkfun.com/commerce/categories.php> 
They are an extremely capable, alert, and well-informed bunch who seem to   
keep up with the field really well. 

Good luck! 

-- 
Nicholas Bodley 
Waltham, Mass. 

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