Date: Tue, 05 Jul 2011 23:56:28 +0400 From: Boris Samorodov <bsam@ipt.ru> 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: <03644739@h30.sp.ipt.ru> In-Reply-To: <201107051730.03784.achill@matrix.gatewaynet.com> (Achilleas Mantzios's message of "Tue, 5 Jul 2011 17:30:03 %2B0300") 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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On Tue, 5 Jul 2011 17:30:03 +0300 Achilleas Mantzios wrote: > 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*** ? I use USB-to-7-RS232-ports devices via /dev/cuaU00-/dev/cuaU06. Works like a charm. But you should find out what chip is used for USB-to-RS232 bridge and (kld)load a driver. > The above link says one needs to talk to the relay with: > 8 Data, 1 Stop, No Parity,Baud rate : 9600 I've never changed those parameters. > 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 use python for scripting and it is as simple as write(data) and read(data). -- HTH and WBR, bsam
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