9-2 Remote Operation Model 6485 Picoammeter Instruction Manual
Selecting and configuring an interface
Interfaces
Model 6485 supports two built-in remote interfaces:
• GPIB interface
• RS-232 interface
You can use only one interface at a time. At the factory, the GPIB bus is selected. You can
select the interface only from the front panel. The interface selection is stored in non-vola-
tile memory; it does not change when power has been off or after a remote interface reset.
GPIB interface — The GPIB is the IEEE-488 interface. Model 6485 must be assigned to
a unique address. At the factory the address is set to 14, but can be set to any value from
0 to 30. However, the address must not conflict with the address assigned to other instru-
ments in the system. You can use either the SCPI or DDC language to program the instru-
ment.
RS-232 interface — When using the RS-232 interface, you must set baud rate, data bits,
parity, terminator and flow control. For the RS-232 interface, you can only use the SCPI
language to program the instrument.
Languages
For the GPIB interface, there are three programming languages to choose from:
• SCPI language (488.2)
• DDC language
• 488.1 language
NOTE For the RS-232 interface, only the SCPI language can be used to program the
instrument. When the RS-232 interface is selected, it automatically defaults to
SCPI.
SCPI language — Standard Commands for Programmable Instrument (SCPI) is fully
supported by the GPIB and RS-232 interfaces. Always calibrate Model 6485 using the
SCPI language.
DDC language — Model 6485 implements most DDCs (device-dependent commands)
available in the Keithley Model 485 picoammeter. The available commands are provided
in Appendix D. See the Model 485 instruction manual for details on operation.
488.1 language — See Appendix G for details.
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