Solved

Setting 16550A serial port to 230,400 bps.

Posted on 1997-12-15
3
676 Views
Last Modified: 2011-04-14
I have an x86-based Linux box with 16550A serial ports (it is a fairly new machine).  Or at least setserial claims that they are 16550A's.  My OS is RedHat 4.2.  I'm using PPP 2.2.I'm trying to connect to my extern ISDN modem (AdTran XRT) at 230.4k.  The modem end is easy -- just a DIP switch.  But I cannot chant the right incantation to make Linux set the serial port to 230k.  I've tried putting things like this in rc.local and/or the ifup-pp script:    setserial /dev/cua0 baud_base 230400 divisor 1 spd_custWhen I do that (and set the modem for 230k), they do not talk anymore.  Does anyone know the right formula?
0
Comment
Question by:jlilley
  • 2
3 Comments
 
LVL 1

Accepted Solution

by:
solmssen earned 50 total points
ID: 1634747
As far as I know - a 16550A can't be set to 230.4K. I have the same problem, and ended up getting a 16650 card from ByteRunner for about $25. This has a jumper so the card tells the system it's 115.2K but talks to the modem at 230.4K. This works very well - I see roughly 16-17Kbytes per second on ftp's.

Try www.byterunner.com for more info.
0
 

Author Comment

by:jlilley
ID: 1634748
Well, it's not the answer I wanted to hear, but $25 is cheap!
0
 

Author Comment

by:jlilley
ID: 1634749
Just contacted ByteRunner...  $20 for the card, $4 for shipping.  Card runs at 480kbps.  Cool!
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How many times have you wanted to quickly do the same thing to a list but found yourself typing it again and again? I first figured out a small time saver with the up arrow to recall the last command but that can only get you so far if you have a bi…
Linux users are sometimes dumbfounded by the severe lack of documentation on a topic. Sometimes, the documentation is copious, but other times, you end up with some obscure "it varies depending on your distribution" over and over when searching for …
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question