+ AA6YQ comments below
I'm going to try rs232 to DXLabs Commander. I have the cable here and an open 232 port on the pc. Just haven't found the back of the amp. No easy job to move it.
I'll post my results.
+ As pointed out by several earlier posts in this thread, Commander's Secondary CAT Port can only control Acom 2000As with the more recent (after 2014) CAT interface, which is described on pages 45-48 of its manual. If your 2000A's manual doesn't have 45 pages, then Commander can't control it.