Date: Wed, 6 Jul 2011 12:49:49 +0300 From: Achilleas Mantzios <achill@matrix.gatewaynet.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: freebsd-multimedia@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: FreeBSD and controlling an alarm via relay Message-ID: <201107061249.49637.achill@matrix.gatewaynet.com> In-Reply-To: <20110706170845.Q84785@sola.nimnet.asn.au> References: <201107041339.22470.achill@matrix.gatewaynet.com> <201107051730.03784.achill@matrix.gatewaynet.com> <20110706170845.Q84785@sola.nimnet.asn.au>
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another thing that puzzles me is power. This board : http://www.ebay.co.uk/itm/USB-Eight-Channel-Relay-Board-RS232-Serial-Controlled-/110710333092?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item19c6d99ea4 needs VDC 12V supply while this one : http://www.ebay.co.uk/itm/USB-Four-4-Relay-Module-Board-Home-Automation-/180646300804?pt=LH_DefaultDomain_0&hash=item2a0f5bcc84 is self powered from USB. batteries do not come cheap, and having an extra AC/DC adaptor is not very good either ... another thing is the relay parameters, i see various figures : Relay parameters: 5V / 72mA, 15A/24VDC (120VAC), 10A/250VAC or Each switch 12VDC/15A or 240VAC/10A or Open (No) and Closed (NC) Contacts rated for voltages: 12VDC/15A; 24VDC/15A; 125VAC/15A; 250VAC/10A my specific application i want to drive is this wireless xmitter : http://www.visonic.com/Data/Uploads/MCT_100_Installer_Guide_English_DE2241U.pdf Should i assume my device that i want my relay to control will have voltage of 3V? for which Voltage/Ampere figures should i opt? are those figures crucial? thanx a lot Στις Wednesday 06 July 2011 11:03:14 ο/η Ian Smith έγραψε: > On Tue, 5 Jul 2011, Achilleas Mantzios wrote: > > Tuesday 05 July 2011 16:10:59 : > > > 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 > > These look quite well designed and built to me, reasonably priced new, > but check out the/a source site [1] for various models, 1- and 4-relay > boards too, or if you prefer, RS-232 serial rather than USB interface > for the 8-relay boards. There's also a simple parallel port to 8 TTL > outputs board (hi Tim!) and various other stuff. I'm tempted myself. > > [1] http://sigma-shop.com/category/4/relay-boards.html > [2] http://www.sigma-shop.com/page/12/manuals.html > > > 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? > > If so, great. If not and you have a serial port, the code will be the > same anyway, except the port used. I grabbed most of the manuals from > [2] and found the Linux software examples are all this one: > > ======= > Linux : > The USB-serial device is automatically detected and mapped to /dev/ > ttyUSB0 (or USB1 in case there is already a similar device). > My test script: (Thanks Julian!) > -------------------------------------------------------- > # cat relay.sh > while true > do > echo -e "\xFF\x00\x00" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x00\x01" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x00\x00" > /dev/ttyUSB0 ; sleep .1 > [..] > echo -e "\xFF\x01\x01" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x02\x01" > /dev/ttyUSB0 ; sleep .1 > [..] > echo -e "\xFF\x07\x01" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x08\x01" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x01\x00" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x02\x00" > /dev/ttyUSB0 ; sleep .1 > [..] > echo -e "\xFF\x07\x00" > /dev/ttyUSB0 ; sleep .1 > echo -e "\xFF\x08\x00" > /dev/ttyUSB0 ; sleep .1 > ======= > > If using sh[1] you might need to use \0377 instead of \xFF > > > do you know any application, perl library, utility or just a guide for standard C serial port programming? > > Anything that can write bytes to a serial port - perl's overqualified :) > > [..] > > cheers, Ian -- Achilleas Mantzios
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