DNF Controls 2044CL_(-A, -O, -NX, -7, -8, -T, -P) - Manual (Page 40)

C. PBIO TROUBLESHOOTING (OPTION ONLY)
Press [SHIFT] + [0 (zero)] to display Pbus Data on LCD screen. For
diagnostic purposes only.
Press [SHIFT] + [0 (zero)] again to exit test mode.
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