FreeBSD and controlling an alarm via relay

[Tim Pozar]

Why not use the parallel port?  Have one of its pins  drive a relay.  You may need to put a transistor in front of the relay.

Software:
http://excamera.com/articles/21/parallel.html

Hardware:
http://www.dakeng.com/relay.htm

Fancy hardware:
http://www.electronickits.com/kit/complete/elec/ck1601.htm

Tim

On Jul 5, 2011, at 9:30 AM, Achilleas Mantzios wrote:

> Στις Tuesday 05 July 2011 16:10:59 γράψατε:
>> On Mon, 4 Jul 2011, Achilleas Mantzios wrote:
>> 
>> [snip]
>> 
>>> I was thinking of some relay board (instead of the old modem), 
>>> possibly ethernet controlled
>> 
>> This box has relays and GPIO available via ethernet. It's probably 
>> overkill for your application, but it's well made and easy to use:
>> 
>> http://www.extron.com/product/product.aspx?id=ipltcr48&s=0
>> 
> 
> That is too big for my application, thanx anyway.
> Most probably i'll go for something cheaper like this one 
> http://www.ebay.co.uk/itm/USB-Eight-Channel-Relay-Board-RS232-Serial-Controlled-/110710346488?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item19c6d9d2f8
> 
> Could i use the ucom driver to talk to the USB device like a normal serial device, via /dev/cua*** ?
> The above link says one needs to talk to the relay with:
> 8 Data, 1 Stop, No Parity,Baud rate : 9600
> and the commands look like:
> FF 01 00 (HEX) 
> or 
> 255 1 0 (DEC)
> 
> could i be able to specify those over ucom? 
> do you know any application, perl library, utility or just a guide for standard C serial port programming?
> 
> i have used mgetty/vgetty in the past to control some modems.
> I do not know if there any fancier methods to access the serial port, but this is how i used to do it, back in 7.*
> /usr/local/bin/vm shell -l cuad1 -S onhook_offhook.pl
> where onhook_offhook.pl reads like:
> #!/usr/bin/perl
> #
> use Modem::Vgetty;
> 
> my $v = new Modem::Vgetty;
> 
> $v->device('DIALUP_LINE');
> $v->send("ATH1");
> sleep(5);
> $v->send("ATH0");
> 
> if i could speak directly with e.g. "255 1 0" like
> $v->send("255 1 0");
> that would be awesome...
> i guess i will have to try it out.
>> I'd also look at manufactureres such as Moxa and LANtronics.
>> 
> 
> 
> 
> -- 
> Achilleas Mantzios
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