5 Programming Examples
272 Keysight Models 6811C, 6812C, and 6813C Programming Guide
Discrete fault indicator (DFI)
The discrete fault indicator is a chassis-referenced, open-collector logic signal
connected to the rear panel FLT connection, that can be used to signal external
devices when a fault condition is detected. To select the internal fault source that
drives this signal, use:
OUTPut:DFI:SOURce QUEStionable | OPERation | ESB | RQS | OFF
To enable or disable the DFI output, use:
OUTPut:DFI:STATe ON | OFF
QUEStionable selects the Questionable event summary bit (bit 3 of the
Status Byte Register)
OPERation selects the Operation Event summary bit (bit 7 of the Status
Byte Register)
ESB selects the Standard Event summary bit (bit 5 of the Status
Byte Register)
RQS selects the Request Service bit (bit 6 of the Status Byte
Register)
OFF selects no DFI source
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