FreeBSD and controlling an alarm via relay
pozar at lns.com
Tue Jul 5 18:21:00 UTC 2011
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.
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:
>>> 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:
> That is too big for my application, thanx anyway.
> Most probably i'll go for something cheaper like this one
> 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)
> 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:
> use Modem::Vgetty;
> my $v = new Modem::Vgetty;
> 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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