[wellylug] DSE Serial Modem Flow Control

Jethro Carr dodocaptain at paradise.net.nz
Wed Feb 9 07:24:05 NZDT 2005


On Wed, 2005-02-09 at 09:05, Jamie Dobbs wrote:
> That looks like a 'soft' modem (ie. WinModem) style of modem to me.
> Best to get rid of it and see if you can find anyone that has a "real"
> modem.


I've never known a external winmodem before... And it can connect to the
web - any winmodem I've ever tried can even be talked to.

I thought that all external modems were full hardware modems. The box
for the modem does claim to be a hardware modem too.


> 
> Jethro Carr wrote: 
> > On Tue, 2005-02-08 at 22:06, Jamie Dobbs wrote:
> >   
> > > Make sure you have a fully compliant modem cable and use hardware flow
> > > control - soft flow-control is generally crap.
> > >     
> > I know I have a decent modem cable. I use the one from the box & I also
> > tried the one from my other modem.
> > 
> > 
> > I've sent an email to DSE support. Maybe they can give me some info. 
> > 
> > Also, here's what I've found from playing around:
> > 
> > I can download anything okay, & upload very small amounts of data (such
> > as a request to view a webpage),but when I want to upload something of
> > common size - such as sending an email, the program will timeout.
> > 
> > I've looked this up in google & the Linux Modem & Serial Port HOWTOs,
> > and they say this sort of program can be caused by flow control not
> > working.
> > 
> > I looked up the AT command set for this modem in the PDF manual, and it
> > says that the K3 & K4 commands should enable flow control. I tried these
> > AT commands, but they appear to make no effect on the problem. I also
> > tried to change the serial port settings with the stty program, but this
> > didn't work either.
> > 
> > The modem lights are like:
> > 
> > DISCONNECTED FROM THE WEB:
> > MR = on
> > CTS = on
> > 
> > CONNECTED TO THE WEB:
> > MR = on
> > TR = on
> > CD = on
> > SD & RD = on when data transfer is occuring.
> > RTS = on
> > CTS = on
> > OH = off
> > 
> > 
> > 
> > if anyone can help me, it would be great.
> > 
> > Does anyone else here have this particular modem? If so, I wouldn't mind
> > seeing what AT commands you use with it.
> > 
> > 
> > thanks,
> > 
> > 
> > 
> >   
> > > > hi all,
> > > > 
> > > > I just got a DSE Electronics Serial 56k Modem
> > > > (http://www.dse.co.nz/cgi-bin/dse.storefront/4207ba1c0067f898273fc0a87f9906e9/Product/View/XH1142)
> > > > 
> > > > 
> > > > It works, except I can't seem to enable flow control. This is a problem,
> > > > because when I try to upload anything, the modem gets the data sent to
> > > > it too fast, and drops the packets. This makes it impossible to even
> > > > send email.
> > > > 
> > > > 
> > > > Can anyone give me some help here?
> > > > 
> > > > I've tried using the &K4 command (to enable xon/xoff), but it doesn't
> > > > appear to do work. :-(
> > > > 
> > > > 
> > > > 
> > > > thanks,
> > > > 
> > > > --
> > > > -- Jethro
> > > > 
> > > > dodocaptain at paradise.net.nz
> > > > jethro.carr at jedolinux.com
> > > > 
> > > > http://www.jedolinux.com
> > > > http://homepages.paradise.net.nz/jethroc
> > > > http://homepages.paradise.net.nz/jethroc/cv.html
> > > > 
> > > > http://www.wellylug.org.nz
> > > > 
> > > > 
> > > > --
> > > > Wellington Linux Users Group Mailing List: wellylug at lists.wellylug.org.nz
> > > > To Leave:  http://lists.wellylug.org.nz/mailman/listinfo/wellylug
> > > > 
> > > > 
> > > > 
> > > >       
> 
> 
> 
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-- 
-- Jethro

dodocaptain at paradise.net.nz
jethro.carr at jedolinux.com

http://www.jedolinux.com
http://homepages.paradise.net.nz/jethroc
http://homepages.paradise.net.nz/jethroc/cv.html

http://www.wellylug.org.nz




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