Date: Thu, 21 Feb 2002 14:59:14 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Re: [LIB] Some answers please?
At 10:20 PM 20/02/2002 -0800, you wrote: >Date: Thu, 21 Feb 2002 06:16:19 >From: "neil barnes" <[EMAIL PROTECTED]> >Subject: Re: [LIB] Some answers please? > > >>Date: Thu, 21 Feb 2002 10:04:39 +0800 >>From: Raymond <[EMAIL PROTECTED]> >>Subject: Re: [LIB] Some answers please? >> >>At 09:11 AM 20/02/2002 -0800, you wrote: >>>Date: Tue, 19 Feb 2002 23:08:09 -0500 >>>From: "Pres Waterman" <[EMAIL PROTECTED]> >>>Subject: Re: [LIB] Some answers please? >>> >>>\> Actisys does make serial port enablers for devices that weren't designed >>>> with IRDA. >>>> >>> >>>Great! What does that mean, an IrDa dongle plugged into a DB-9F socket, and >>>it presents itself to the infrared world as a comport? >> >>Don't count on it ... ref what I said about only Tx and Rx being available ... I >don't like the chances of your serial cellphone working for instance as it'd probably >also require the CD/RI lines. Unless the Actisys comes with a driver to reconstruct >these lines (in which case you'd take a speed hit) all it'd be doing is what I >mentioned in my essay earlier on. > >I haven't looked at the IRDA spec, so I'm guessing here...but I can't imagine that >*anyone* (even MS) is dumb enough to implement a serial link without flow control of >some sort. > >There are plenty of examples of flow control using either in-band or out of band >signalling within the channel and just using two or four wire connections. > >Any rational adaptor (serial to optical) should be capable of interfacing to the full >collection of control lines on a serial port - tx/rx, ctr/dtr, and cts/hook at a >minimum. > >Of course, whether the IRDA interface implements those things to the driver is >another question :) I'm not saying there ISN'T any flow control, I'm saying that any flow control that exists will have to run over TX/RX because there ISN'T an extra pair of lines available for RTS/CTS. Perhaps what I'm really saying is once you get into devices that require explicit RTS/CTS lines and whatnot that must be separate from the Rx/Tx lines then the solution is no longer trivial. Bear in mind though, a lot of serial devices really only do use 2 lines - Rx and Tx - and have their flow control implemented over that. I do get the idea we're all saying the same thing in different ways though ... heh - 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 **************************************************************
