Greetings. I too have an antminer that is throwing a high rate of errors and I'm having problems with downclocking a single antminer. When I run the device list, I see all of them listed as \\.\COM(NUM). of course this doesn't help when you have more than one as you don't know which is which. but i deduced it was COM54. when I run bfgminer with the --set-device for that path, it seems a random antminer will be downclocked. never seems to be the same one nor the problem antminer.
The U1 may support sending it an identify command so that its LED lights up. I'll have to look into it.
On my side I was able to identify the com port by removing all except one. Then, run the command, so I know which it is. It seems Windows assign a port to a specific usb port.
Thanks for the reply. As I mentioned, I was able to find out the COM number for the one that was causing all the errors and it was by doing the exact same thing. Unfortunately, when I ran the command specified to downclock the misbehaving antminer, one antminer would be downclocked and one would still be throwing errors. haven't had time to go through the entire process again to see if it's the exact same one or a different one throwing the errors.
just an annoyance for me, and i don't fault the programmers for this, is that it seems the detection of the devices is random so for example, COM5 may be ANT0 when you run it one time, but another time COM5 may be ANT5. seems to be no rhyme or reason.
BFG allocates the slots on first started, first in, so it is different each time you start.
one of my miners was throwing a lot of errors, I re arranged them into different slots, I found one of the slots on my hub was weak.(left that one empty)
moved it to another hub and now, zero errors. (not hashing any faster tho.)