Date: Tue, 19 Feb 2002 22:41:55 +1300 From: Fran <[EMAIL PROTECTED]> Subject: Re: [LIB] Some answers please?
What is this? The Spanish Inquisition? Fran :):):) On Tue, 19 Feb 2002 21:26, you wrote: > Date: Tue, 19 Feb 2002 16:18:43 +0800 > From: Raymond <[EMAIL PROTECTED]> > Subject: Re: [LIB] Some answers please? > > At 11:56 PM 18/02/2002 -0800, you wrote: > >Date: Tue, 19 Feb 2002 15:51:43 +0800 > > From: Raymond <[EMAIL PROTECTED]> > > >Subject: Re: [LIB] Some answers please? > > > >At 06:12 PM 18/02/2002 -0800, you wrote: > >>Date: Mon, 18 Feb 2002 20:08:18 -0500 > >>From: "Pres Waterman" <[EMAIL PROTECTED]> > >>Subject: Re: [LIB] Some answers please? > >> > >>don't overclock it). What do you need to run off the serial port? It > >> might well be faster/easier to use the infrared serial port, its a > >> (relatively) trivial matter adapting most serial devices to run off > >> that. Of course, your OTHER problems > >> > >>Please explain how to take the following serial devices and trivially > >> adapt them to IrDa so I can easily use them with my Libretto: > > > >well there are a number of ways of doing things. They're (relatively) > > low speed so if you were willing to take them apart (and if you're > > lucky!) you can get the raw RX/TX lines from whatever device you're > > looking at BEFORE the RS-232 driver IC and pipe them through to an IrDA > > tranciever (I got a few Agilent HSDL-1001-011 low-speed IrDA compliant > > trancievers for about $4USD or so which I was going to play with, there > > are higher speed ones such as the HSDL-1100-018 but they're more > > complicated to play with due to more signal shaping components > > required). If you're unlucky you'll find that the signals emerge from > > the microprocessor already at RS-232 levels so you'll need to use the > > alternative idea. Both trancievers should give you at least a foot of > > transmit distance with a visible angle of a bit over 90� (thats being > > conservative, I've had better but things start going loopy). > > Gah! OK I forgot to mention one thing. Two things actually. OK three. > > 1: This will ONLY work on devices that need only Tx and Rx lines because > thats all that your IrDA port on your PC effectively has (so your serial > mice, standard serial modems and some of your unpowered barcode scanners > won't work because they need the other signal lines). Of course, you > could always fudge these as normally they're stuck in one state or > another anyway. If in doubt, break out the signal when the device is > normally plugged into the computer and see what the RTS/CTS, DTR/DSR and > CD/RI lines are doing. Whatever you do, don't let these lines float, it > might work sometimes but other times the device might wait forever for a > RTS/CTS handshaking signal that never comes. I've not come across this > problem because most of my mucking around isn't with modifying existing > hardware but according to a quick google, > http://www.airborn.com.au/rs232.html recons that RTS and CTS should be > looped back onto themselves (like a null modem). The flow control lines > DTR/DSR would be trickier to deal with ... dunno how you'd handle those. > As for CD/RI, apart from modems and mice (which leech their power from a > number of the control lines) I don't think anything else actually USES > them so you might be safe just tying them to whatever their states are > normally. Oh ya, and when I say tying high or low, they'd be RS-232 > levels which are nominally plus or minus 12 volts or so ... if you're > using a MAX232 you'll have a spair TX/RX pair (because the MAX232 caters > for both TX/RX as well as RTS/CTS) so just tie the extra voltage pump > buffer high or low and you'll have your plus or minus 12 (however, if you > need to tie some lines to plus 12 AND some lines to minus 12 then you'll > be in a pickle ...). > > 2: I forgot, another company that makes those trancievers is Infineon > (sp?) and that Agilent is actually part of HP if you're wondering where > they popped out from. > > 3: Your software and OS has to be able to treat the IrDA port as just > another serial port. Note that Win95 with the IrDA patch has 2 modes of > operation, the 'proper' IrDA operation (needed for such things as > wireless modems, printers and so on) and 'old' mode where it treats the > IrDA port as a stock standard serial port ... IIRC thats the mode you'll > have to be in because the 'proper' mode has a pile of other plug and > play, autoscan junk (which obviously won't work with a 'hacked' IrDA > tranciever at the other end because it won't know how to reply to the > autoscan PnP signals). You'll need to install some patched > somethingorother to get the thing doing serial port emulation under Win2k > as by default, Win2k treats the IrDA port as a 'weirdo' device and not a > serial port. If you have a Nokia mobile phone (or even if you don't) you > can download Nokia's data suite for 2k and that has a driver that'll let > you do similar things with the IrDA port under 2k (ie. make it look and > act like another serial port) but I'm not *too* familiar with it so again > your milage may vary. > > 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. 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