D-2 DDC Emulation Commands Model 6485 Picoammeter Instruction Manual
DDC language
The Model 6485 can be configured to accept device-dependent commands (DDC) of the
Keithley Model 485 picoammeter. The commands for controlling the Model 6485 with the
DDC language are provided in Table D-1. For details on Model 485 operation, refer to the
appropriate instruction manual.
Since the architecture of the Model 6485 differs from that of the other picoammeters,
some commands are different and cannot be used. Be sure to refer to the notes at the end
of the table for information on command restrictions. Commands marked NDS are not
directly supported in the SPCI command set. For convenience, some new DDC commands
have been added to the 485 command set to allow use of the expanded capabilities of the
6485. These commands are marked NEW.
CAUTION
The DDC language is intended to be used only over the IEEE-488 bus.
Using front panel controls in conjunction with this language may cause
erratic operation. In this case, results cannot be guaranteed.
Table D-1
Device dependent command summary
Mode Command
Description
Equivalent SCPI commands
Note Default
Reading
Mode
B0 Picoammeter Readings
READ?, FETCh?, MEAS?, or
[SENSe[1]]:DATA[:LATest]?
NDS,
NEW
X
B1 Buffer reading (returns one at a time)
TRACe:DATA? (returns entire buffer)
NDS,
NEW
B2 Maximum reading from buffer
CALCulate3:FORMat MAXimum
CALCulate3:DATA?
NDS,
NEW
B3 Minimum reading from buffer
CALCulate3:FORMat MINimum
CALCulate3:DATA?
NDS,
NEW
Zero Check
C0 Zero Check off
SYSTem:ZCHeck OFF
X
C1 Zero Check on
SYSTem:ZCHeck ON
LOG
D0 LOG off
CALCulate[1]:STATe OFF
X
D1 LOG on
CALCulate[1]:FORMat LOG10
CALCulate[1]:STATe ON
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