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[aprssig] (Ab)Use of APRS for telemetry? Anyone doing it?

Robert Bruninga bruninga at usna.edu
Mon Dec 6 17:06:35 UTC 2004


>>> scott at opentrac.org 12/6/04 10:17:08 AM >>>
>I haven't seen the KPC-3+'s password-protected I/O 
>feature.  I'll have to check that out....

Actually, what I was referring to was the remote-sysop
logon feature only.  It is a decent enought password
scheme but then once loged on, you can send the
CTRL A or CTRL B ON/OFF commands to switch
(or pulse) the two user open-drain FETs in the KPC-3+.

For a 3rd on/off function, you can internally tap the
LEDS ON/OFF line  And for a 4th you can tap the
CONNECTED LED and then via Remote Sysop 
and BUDLIST disallow anyone to connect except
the SYSOP.

For a 5th ON/OFF circuilt you can do the same with
the MAIL LED.  Dissallow PBBS access to anyone
but the remote sysop, and then he can turn on that
circuit by sending a message to himself...

Bob, Wb4APR


-----Original Message-----
From: aprssig-bounces at lists.tapr.org 
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Robert Bruninga
Sent: Monday, December 06, 2004 6:51 AM
To: aprssig at lists.tapr.org 
Subject: RE: [aprssig] (Ab)Use of APRS for telemetry? Anyone doing it?


>I think the APRS telemetry system is a bit too 'heavy'
>for most simple systems to implement.

That sentence is a little harsh. Just to clarify that statement:

Well, its main advantage is that it is built-in to every one
of the thousands of Kantronics KPC-3+ TNC's and
every one of the original Mic-E's and Mic Encoders
and it is simple and human readable:  FOrmat is:

T#SSS,111,222,333,444,555,xxxxxxxx

Where SSS is the serial number
111-555 are the 5 channels of analog values (0-999)
and xxxxxxxx is the status of 8 bits.

Also the KPC-3+ TNC gives the user 3 on/off password
protected ON/OFF switch functions.

In fact, we use Kantronics TNC's as-is as the basis
for the satellties we have been building using just
this built-in telemetry and command control...

de WB4APR, Bob




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