Just had a weird thing happen with my LVB tracker (which has worked fine for a couple years now). I powered on the G5500 and the LVB screen did not light up. After a lot of fiddling, it turns out that if I disconnect the RS232 when I turn it on, all is well. Plug RS232 back in, and it controls fine. I just can't power it up with the computer serial connection hooked up.
Any ideas?
73,
Burns WB1FJ
Isolatiion shorted (OR OVERVOLTAGE) on COM port?
Ask why a device would not deliberately turn on given a set of conditions.
IF you'd like to spend the afternoon parts swapping, the line driver is a standard cross.
OTOH, There are a spare line driver pair on the MAX233 chip, unused and terminated.
This stuff is great fun, entertaining just long enough to go "POOFTA". Then things get expensive.
Norm n3ykf
On Sun, Feb 18, 2018 at 8:15 PM, Burns Fisher burns@fisher.cc wrote:
Just had a weird thing happen with my LVB tracker (which has worked fine for a couple years now). I powered on the G5500 and the LVB screen did not light up. After a lot of fiddling, it turns out that if I disconnect the RS232 when I turn it on, all is well. Plug RS232 back in, and it controls fine. I just can't power it up with the computer serial connection hooked up.
Any ideas?
73,
Burns WB1FJ _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
It makes some sense that grounds were reversed or some such. But what I can't quite figure out is why it only affected startup. If I start it up and then plug in the serial line, all is well. Not to mention it seemed to start when I upgraded SatPC32.
Anyway, using a USB dongle rather than the serial port right on the computer seems to have solved the problem if not the mystery.
Thanks!
On Tue, Feb 20, 2018 at 12:26 PM, Norm n3ykf normanlizeth@gmail.com wrote:
Isolatiion shorted (OR OVERVOLTAGE) on COM port?
Ask why a device would not deliberately turn on given a set of conditions.
IF you'd like to spend the afternoon parts swapping, the line driver is a standard cross.
OTOH, There are a spare line driver pair on the MAX233 chip, unused and terminated.
This stuff is great fun, entertaining just long enough to go "POOFTA". Then things get expensive.
Norm n3ykf
On Sun, Feb 18, 2018 at 8:15 PM, Burns Fisher burns@fisher.cc wrote:
Just had a weird thing happen with my LVB tracker (which has worked fine for a couple years now). I powered on the G5500 and the LVB screen did
not
light up. After a lot of fiddling, it turns out that if I disconnect the RS232 when I turn it on, all is well. Plug RS232 back in, and it
controls
fine. I just can't power it up with the computer serial connection
hooked
up.
Any ideas?
73,
Burns WB1FJ _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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Norm n3ykf