Re: [amsat-bb] TNC Question

[Bob Nielsen <nielsen@xxxxxxxxxxxx>]

Jim,

The manual is correct.  


                Table 2-4.  DIP switch settings for serial port
                                  baud rates.

                    Baud Rate   Switch  1   2   3   4   5

                       300             ON  OFF OFF OFF OFF
                      1200             OFF ON  OFF OFF OFF
                      2400             OFF OFF ON  OFF OFF
                      4800             OFF OFF OFF ON  OFF
                      9600             OFF OFF OFF OFF ON

          CAUTION:  Only one of these switches may be ON at any time.

In addition, SW7 should be ON for a 1200 baud radio port rate.

If this doesn't work, something is broken in your TNC.

The updated TAPR TNC-2 manuals, from which the MFJ 1200/1270 manual was
adapted, is available from:

ftp://tapr.org/software_lib/tnc/tncdocs.zip

This may have a bit more troubleshooting information than is contained in
the MFJ manual.

Bob Nielsen, W6SWE


On Tue, 9 Mar 1999, Jim Sanford wrote:

> Hi:
> Slightly, but not completely off topic:  I just acquired the loan of an
> MFJ 11274 TNC.  It's an old one, the ROM date (according to sign on
> message) is 1990.
> 
> My question:  How do you set the terminal baud rate?
> I downloaded the MFJ manual from their web site, but the dip switch
> settings in there DO NOT WORK.  By a lot of experimentation, I
> discovered that setting switches 4 and 5 to ON results in 1200 baud on
> the terminal.  Despite the fact that the manual sez only 1 switch on at
> a time.  I have not been able to make any other baud rate work..
> 
> I'd guess that at some point they changed the algorithm for setting
> terminal baud rate....SOOOOO... does anyone else have an ancient
> 1270/1274 that could help me figure this out??
> 
> Thanks.
> 
> 73,, Jim
> wb4gcs@amsat.org
> 
> 
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----
Bob Nielsen                 Internet: nielsen@primenet.com
Tucson, AZ                  AMPRnet:  w6swe@w6swe.ampr.org
DM42nh                      http://www.primenet.com/~nielsen


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