Date: Tue, 5 Jul 2011 12:43:10 -0500 From: Tim Pozar <pozar@lns.com> To: Achilleas Mantzios <achill@matrix.gatewaynet.com> Cc: freebsd-multimedia@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: FreeBSD and controlling an alarm via relay Message-ID: <295D8D24-CAE4-4EB6-BCF1-EEE7B8623D85@lns.com> In-Reply-To: <201107051730.03784.achill@matrix.gatewaynet.com> References: <201107041339.22470.achill@matrix.gatewaynet.com> <alpine.BSF.2.00.1107050902220.63675@tripel.monochrome.org> <201107051730.03784.achill@matrix.gatewaynet.com>
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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: > =CE=A3=CF=84=CE=B9=CF=82 Tuesday 05 July 2011 16:10:59 =CE=B3=CF=81=CE=AC= =CF=88=CE=B1=CF=84=CE=B5: >> On Mon, 4 Jul 2011, Achilleas Mantzios wrote: >>=20 >> [snip] >>=20 >>> I was thinking of some relay board (instead of the old modem),=20 >>> possibly ethernet controlled >>=20 >> This box has relays and GPIO available via ethernet. It's probably=20 >> overkill for your application, but it's well made and easy to use: >>=20 >> http://www.extron.com/product/product.aspx?id=3Dipltcr48&s=3D0 >>=20 >=20 > That is too big for my application, thanx anyway. > Most probably i'll go for something cheaper like this one=20 > = http://www.ebay.co.uk/itm/USB-Eight-Channel-Relay-Board-RS232-Serial-Contr= olled-/110710346488?pt=3DUK_BOI_Electrical_Components_Supplies_ET&hash=3Di= tem19c6d9d2f8 >=20 > 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)=20 > or=20 > 255 1 0 (DEC) >=20 > could i be able to specify those over ucom?=20 > do you know any application, perl library, utility or just a guide for = standard C serial port programming? >=20 > 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; >=20 > my $v =3D new Modem::Vgetty; >=20 > $v->device('DIALUP_LINE'); > $v->send("ATH1"); > sleep(5); > $v->send("ATH0"); >=20 > 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. >>=20 >=20 >=20 >=20 > --=20 > Achilleas Mantzios > _______________________________________________ > freebsd-multimedia@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia > To unsubscribe, send any mail to = "freebsd-multimedia-unsubscribe@freebsd.org"
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