Date: Mon, 14 Jul 2008 21:05:12 +0100 From: spellberg_robert <emailrob@emailrob.com> To: fbsd_chat <freebsd-chat@freebsd.org> Subject: Re: 50 baud is dead Message-ID: <487BB178.90000@emailrob.com> References: <g58mmb$16sj$1@kemoauc.mips.inka.de> <200807121018.39240.doconnor@gsoft.com.au> <g5a2p4$1uuu$1@kemoauc.mips.inka.de> <200807131004.43681.doconnor@gsoft.com.au> <alpine.BSF.1.10.0807130945370.94782@wonkity.com> <487A32BB.1040306@telenix.org>
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Chuck Robey wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Warren Block wrote: > >>On Sun, 13 Jul 2008, Daniel O'Connor wrote: >> >> >>>On Sat, 12 Jul 2008, Christian Weisgerber wrote: >>> >>>>Daniel O'Connor <doconnor@gsoft.com.au> wrote: >>>> >>>>>>It turns out that uplcom(4) adapters don't support the required >>>>>>speed of 50 baud anymore. >>>>> >>>>>You know, it might actually support it if you hack up the driver. >>>>>The source says the PL2303X "can set any rate". >>>> >>>>The data sheet disagrees. >>>> >>>>"The flexible baud rate generator of PL-2303X could be programmed to >>>> generate any rate between 75 bps and 6Mbps." >>> >>>I guess you're out of luck then :( >> >>Or just try it at 75 and see if there's enough slop to read the 50 baud >>data. > > There won't be, 50% is way too far off, I think (from experiments I did 30 years > back) that about 12% is the limit, when I had access to the best regenerators. > Regens don't even get used anymore. I forget the actual limit I probed, but I > know 1/2 over is way too far to go. > >>-Warren Block * Rapid City, South Dakota USA first, in very round numbers, you get about five per cent error in the bit_time for fifty per cent error in ten bits. usually, there are three reads, all near the center of the bit_time. so, ya gotta be kinda close. two per cent leaves plenty of room for slop. i have an inexpensive hardware solution. if any one is interested, please respond off_list, unless you think it appropriate for -chat. rob
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