Date: Sat, 23 Feb 2002 23:10:34 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Re: [LIB] Some answers please?
At 06:50 AM 23/02/2002 -0800, you wrote: >Date: Mon, 1 Jan 1990 00:09:47 -0500 >From: "Pres Waterman" <[EMAIL PROTECTED]> >Subject: Re: [LIB] Some answers please? > >> > >> >I'm enjoying this, and learning a lot, but I think we have established >the >> >premise that IrDa conversion is not "trivial" >> > >> >> I thought we'd established the opposite: IRDA -> full duplex serial is a >> one-chip solution plus IR transmit/receive and power. It's certainly >simpler >> than a modem, which does the same job down a pair of wires. > > >What's the chip number, and where do I get it? If you know FOR SURE you only need Tx and Rx AND you don't need to go higher than 115200 I recommend the Agilent HSDL-1001-011 tranciever if you're wiring straight into TTL level RS-232 encoded signals (ie. inverse polarity 0 to 5 volts) due to the very nice data sheets that come with it and low number of extra components required (a couple of caps, a resistor and a well regulated supply in this case). If you can only get access to the RS-232 level signals (ie. inverse polarity -12 to 12 volts) plase a Maxim MAX232 buffer/voltage pump between the RS-232 lines and the Agilent device. Suitable circuit diagrams come on the data sheets available from the websites of both manufacturers. Farnell (www.farnell.com) amongst other places should sell both chips. When hooked up to the computer, make sure you're running in plain Ir Tx/Rx mode (apparently called 2 wire mode) ... its the mode where Windows can't autoscan for devices. Dunno about Win2k but under 9x this is when you DISABLE IrDA in control panel. If your device needs more than the Tx and Rx lines then, well, you've heard the arguments all week! ;-) If you need to go faster than 115200 then the circuit design becomes more complicated even if you only need Tx and Rx due to the increased necessity for nice signal shapes. Consider the Agilent HSDL-1100-018 tranciever, again it comes with a nice data sheet but it isn't as easy to work with. Both trancievers come in surface mount packaging but they seem pretty tolerant of high heat levels (ie. they survived my poor hand soldering with my $15 iron!) so you shouldn't have too much trouble with them. Hope this helps! - Raymond --- /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\ | | "Does fuzzy logic tickle?" | | ___ | "My HDD has no reverse. How do I backup?" | | /__/ +-------------------------------------------| | / \ a y b o t | [EMAIL PROTECTED] | | | HTTP://www.raybot.net | | ICQ: 31756092 | Need help? Visit #Windows98 on DALNet! | \~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/ ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://libretto.basiclink.com/archive - Archives http://www.picante.com/~gtaylor/portable/faq.html - FAQ -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
