single integer
bit 0 – set if uncalibrated
bit 1 – set if DSP zero error
bit 2 – set if DSP run error
bit 3 – not used
bit 4 – System error,FPA initialisation
bit 5 – System error, DSP RAM
bit 6 – System error, DSP run
bit 7 – System error, external RAM
bits 8 – 14 not used
> 15 – major system