Stanford Research Systems SR860 Operation Manual page 18

xvi Commands
Error Status Byte
bit name
0 CLK
1 BACKUP
2
3
4 VXI
5 GPIB
6 USBDEV
7 USBHOST USB host error (memory stick error)
SR860 DSP Lock-in Amplifier
usage
External 10 MHz clock input error
Battery backup failed
unused
unused
VXI-11 error
GPIB fast data transfer mode aborted
USB device error (interface error)