I do believe the correct power supply is a PS14.
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Stefan,
Thanks, but I don't think any congratulations are in order. I simply installed my PR4 as per the Digitrax instructions and set up my profiles per the JMRI instructions. (I'm anal that way. I figure the folks who make the product have a pretty good idea about how to make it work, so I tend to follow their instructions religiously.)
That said, I looked at the docs the OP posted and can see two possible issues (that may be related).
One is the use of the "Digitrax PS4 70W Universal AC/DC Power Adapter with adjustable output voltage". I'm unable to find a reference to the PS4 on the Digitrax site, not even in their retired products section. But if this power supply provides an AC output, it should not be used with the PR4. On page 2, the PR4's instructions clearly say "14v DC power is required for Sound/Decoder Programming via USB."
The other is the "308 - No acknowledge from locomotive" error when trying to identify the decoder. That could be an issue between the PR4's outputs and the decoder (poor connection, improperly wired decoder, dirty track/wheels, etc), or it could mean that the programming portion of the PR4 was damaged by the use of an AC power supply (while the communication portion, which is USB-powered and opto-isolated, continues to work.)
HTH,
Steve
"Breezlys"
NB: Some time back I was informed by Digitrax Support that one of the reasons they included a power supply with the PR3 Xtra was that they were getting too many service calls for improperly-powered PR3's, and they specifically mentioned AC power as one of the issues.? Since the PR4 instructions specifically state to use DC power, I have no reason to believe this doesn't also apply to the PR4. So unless I ever have authoritative evidence to the contrary, I will only ever use DC power for my PR3 and/or PR4.
