Keithley 6512 Instruction Manual page 144

Interface Function Codes
DC (Device Clear Function)—The DC function defines the
ability of the Model 6512 to be cleared (initialized).
DT (Device Trigger Function)—The ability for the Model
6512 to have its readings triggered is provided by the DT
function.
C (Controller Function)—The Model 6512 does not have
controller capabilities.
C-2
TE (Extended Talker Function)—The Model 6512 does not
have extended talker capabilities.
LE (Extended Listener Function)—The Model 6512 does
not have extended listener capabilities.
E (Bus Driver Type)—The Model 6512 has open-collector
bus drivers.