Maybe the reader got marked offline to VS1 because it wasn't ready. Issue a DISPLAY UNITS command to check:
d u,,,00c,1
IEE450I 23.01.35 UNIT STATUS 188
UNIT TYPE STATUS VOLSER VOLSTATE
00C 2540 OFFLINE
If it shows as OFFLINE, vary it online:
v 00c,online
IEE302I 00C ONLINE
and then put a job in the reader and start it.
If that's it, maybe we need to play with the DEVSTAT NIP function so it doesn't put unit record devices offline at startup.
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