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