From the dark, distant past...
I just finished a round of UP5, UR-91 and UR-92 issues that had been vexing me for the past few weeks.
For my original Digitrax radio setup I ran two UR-91 recievers and about 6 UP-5 panels for convenient plug-in for address changes.
I did wire my track status LEDs to the appropriate rails and that is all they are, just LEDs wired to the rails. AFAIK they have NO relation to loconet or throttle functions.
I DID wire the little PC pad so I could daisy chain all the UR-91s and UP-5s together so I could take advantage of Digitrax "stay alive" battery feature that they mention.
In an earlier thread of mine, I mentioned that my UR-92 leaks!
Well, it was... somehow the 12v power feeding the UR-91s (and later UR-92s, I'll get to that) so when the power was OFF to the DCS200 and boosters the green LEDs on the boosters was still glowing.
THEN, I unpluged the Digitrax supplied wall-wart from the household 115v plug and with the DCS200 ON the LED on the wall-wart was glowing bright green even with the wall-wart unplugged from the wall.
SO, something strange was going on indeed!
Then, one day with the UR-92 still unplugged from the DC power supplyl, I turned on the DCS200 to run some trains and I happened to unplug my throttle from the UR-92 and I happened to look at the voltage status when it flashes on the display. It read something like 4.9 volts. So upon further digging, the only thing I came up with was that there must have been a fault in my loconet wiring.
By chance I found one of my RJ12 plugs had corroded slightly on only 2 of the 6 contacts but this seems to have been enough to cause all of this crazyness. All I can figure is that a little water dripped on the plug while doing some scenery.
Get your Loconet tester out and check all your Loconet connectors.
Everything on the layout ran fine even with this fault but the odd behavior of the boosters' LEDs and the green LED on the wall-wart even when it wasn't plugged in to the 115 VAC was making me nuts.
The reason I'm mentioning the UR-91 and 92s is that in the middle of all this I had sent my throttles back to Digitrax for the duplex upgrade and bought two more UR-92s for duplex so I had all these changes going on.
SO, bottom line is, I disconnected all my UP-5s from the 12V power wire and I only power-up the UR-91s and 92s when the layout is powered on.
Forget the keep-alive for the throttles, now I just pop freshly charged batteries before I'm ready to run. The UP-5s don't need any external power.
I have the track status LED's wired but they are of limited use and they make the whole panel light up distractedly.
In a long winded way, I hope this helps you out... ED