Date: Tue, 5 Jul 2011 17:30:03 +0300 From: Achilleas Mantzios <achill@matrix.gatewaynet.com> To: Chris Hill <chris@monochrome.org>, freebsd-hardware@freebsd.org, freebsd-multimedia@freebsd.org Subject: Re: FreeBSD and controlling an alarm via relay Message-ID: <201107051730.03784.achill@matrix.gatewaynet.com> In-Reply-To: <alpine.BSF.2.00.1107050902220.63675@tripel.monochrome.org> References: <201107041339.22470.achill@matrix.gatewaynet.com> <alpine.BSF.2.00.1107050902220.63675@tripel.monochrome.org>
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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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