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[DPRG] Serial Woes
Subject: [DPRG] Serial Woes
From: Eric Sumner
kd5bjo at gmail.com
Date: Sat Feb 3 16:36:19 CST 2007
> Does taht seem to amke sense?
Yes, but I have some new data that demonstrates that there are some
really funny interactions going on here. When I attach the servo
controller to the serial adapter, the level of the servo pulses going
to my MD22 drops to about 2.5V and is really noisy. The problem stays
there until I disconnect the serial line and power-cycle the MD22. I
can't remember if I also have to reset the servo controller. These
symptoms also occur if I don't connect the serial line proper, but
just the power lines. I think I may have a ground loop through the
serial port on the computer. I'm going to try cutting the ground
connection between the servo controller and the serial adapter and see
what happens. If that doesn't work, I'll be all out of ideas.
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