Hi,
I’m trying to use LynxTerm to group-test my servos using the procedure that’s outlined in the SSC-32 manual. Everything works as it should when I have a single servo connected, but as soon as I try to do the test with two servos only the highest channel works (i.e. with #0 and #1 connected, only #1 will move).
I’ve tested all servos independently and I make sure to power down before making any connections. Is there something simple that I’m doing wrong? Thanks…
It’s most likely a power issue. Try powering the VL terminal with 9vdc and remove the jumper VS=VL. This will isolate the logic and servo power supplies. Preventing the SSC-32 from a brownout reset. What are you using for VS servo power?
I thought that could be it too, so I’ve done that already. I’m using a Kepco power supply outputting 6VDC for servo power and a plug-in AC/DC converter (set to about 8.4VDC) for the logic power. I’ve verified both of these values with a voltmeter. Thanks for the quick reply, any more ideas?
Please show me what you are typing into the LynxTerm window, what you expect to happen, and what actually happens. I’m sure we can sort it out. 
Since your last reply I’ve been playing around with it a bit, and I’ve had different levels of success. I haven’t successfully got all three servos to move at the same time to different locations. I can get it to do what I want sometimes, and other times the commands that I send seem to yield totally random results. For instance (with three servos in channels 0, 1, and 2):
I type #0 P800 #1 P2000 #2 P1000. This should move all three servos to the specified positions. What happens is only #0 and #2 move. Then, if I center them all up type the exact same command, I get #1 and #2 working, but not #0.
Even if I’m trying to get them to move to the same place (all centered at the beginning, I type #0 P2200 #1 P2200 #2 P2200) it still doesn’t work. I can usually only get two of three servos to move, and more worrisome is that the two that move don’t necessarily rotate to the same place or even in the same direction.
If I want to play with a single servo, I can do it by manually selecting the channel in the terminal window and manipulating the slider bar; single servo commands also seem to work. The All=1500 button seems to work all the time as well.
I’m starting to become worried that this is all related to a shoddy USB-serial adapter that I’m using. I had a previous thread on the forum about this, and maybe I didn’t solve the problem as well as I thought I did.
I’ve honestly never heard of this sort of problem. Usually USB cable troubles are hard faults, but it’s certainly possible. Get a name brand unit with FTDI if possible. This testing you are doing is not timing intensive, so if it is the cable it’s not very good at all. 
Please let us know what solves it.
