I am new to O Gauge. My small layout has the MTH DCS Commander (50-1028). I purchased Barry's DCS O Gauge Companion, and followed the directions for downloader software and installing version 1.40 of the Commander software. Everything works just fine.
I also see that there is a "DCS V 4.20" of the operating software on the Ptorot Sound web site. In Barry's book it appears that this applies to handheld remotes and TIU's. Does the V 4.20 software update also apply as an install to the DCS Commander, or does install of the V 1.40 Commander update file suffice?