D-2 DDC Emulation Commands
DDC language
The Model 6514 can be configured to accept device-dependent commands (DDCs) of the
Keithley Model 6512, 617, or 617 HIQ electrometer. The commands for controlling the Model
6514 with the DDC language are provided in Table D-1. For details on Model 6512, 617, and
617 HIQ operation, refer to the appropriate instruction manual.
Since the architecture of the Model 6514 differs from that of the other electrometers, 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.
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 Note
Calibration Value
Reading Mode
Zero Check
Function
Data Format
Hit Key
Buffer Size
none
B0
B1
B2
B3
C0
C1
F0
F1
F2
F3
F4
G0
G1
G2
H0
Hn
In
A (calibration) commands not supported
Electrometer
Buffer reading
Maximum reading
Minimum reading
Zero Check off
Zero Check on
Volts
Amps
Ohms
Coulombs
External Feedback
Reading with prefix (NDCV-1.23456E+00)
Reading without prefix (-1.23456E+00)
Reading with prefix and buffer suffix (if in B1)
(NDCV-1.23456E+00+00,012)
Manual trigger
Hit front panel key, where “n” = 1 to 32 (see Figure
16-3 for key press codes)
Set buffer size, where “n” = 1 to 2500.
A
B
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