CentOS - Sep 2009 - For you old-timers, an RS232 question about data rate confirmation.

Hello all.

This is a question that I should be able to answer, but the old grey
cells aren't working. My Google-Fu must not be up to snuff, either.

I have a MOXA IP-RS232 converter that I'm going to be using over an RF
WAN and I need to confirm the actual data rate that I'll be able to
achieve.  I have the drivers loaded (/dev/ttyr00) and a loopback plug on
the end of the device.  I am able to confirm that it works fine with
minicom, but I'd like to be able to have a program read/write the device
with a largish file and give me a throughput rating.

Short of writing my own program, can anyone point me to a good tool for
that purpose.   yum search RS232 and yum search serial haven't provided
what I'm looking for and I can't imagine that this isn't already
done.

Thanks!

Barry

On Tue, Sep 01, 2009 at 03:38:23PM -0400, Barry L. Kline
wrote:
> the end of the device.  I am able to confirm that it works fine with
> minicom, but I'd like to be able to have a program read/write the
device
> with a largish file and give me a throughput rating.
Since you have loopback adapter connected you need to read/write from
the device at the same time.  So...  first attempt:
  cat </dev/ttyr00 > /dev/null &
  time cat large_file > /dev/ttyr00

Been a long time since I played with serial comms, but that'd be my first
attempt.

Second attempt would be to make a full serial connection to another machine
(port on the same machine?) and use "ckermit" to transfer a file.

-- 

rgds
Stephen

On Tue, 1 Sep 2009, Barry L. Kline wrote:
> Short of writing my own program, can anyone point me to a good tool for
> that purpose.   yum search RS232 and yum search serial haven't provided
> what I'm looking for and I can't imagine that this isn't
already done.
Are the Kansas City cassette tape storage PLL sampling 
routines still about?  Or hit ^h repeatedly, until sync is 
achieved, as we did in the old modem days .... 110 bps v 300 
on a good link with a Don Lancaster Pennywhistle modem ;)

As I understand the problem it may be that the signal could 
degrade from whatever max data rate the circuit is rated for. 
I am not aware of a resampling routine in any recent kit that 
CentOS ships

-- Russ herrold

Barry L. Kline wrote:
> Short of writing my own program, can anyone point me to a good tool for
> that purpose.   yum search RS232 and yum search serial haven't provided
> what I'm looking for and I can't imagine that this isn't
already done.
For writing have you tried dd ?

nate