9-2 Remote Operation Model 6487 Reference Manual
Selecting and configuring an interface
Interfaces
The Model 6487 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-
volatile 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. The Model 6487 must be
assigned to a unique address. At the factory the address is set to 22, but can be set to any
value from 0 to 30. However, the address must not conflict with the address assigned to
other instruments in the system. You can use either the SCPI or DDC language to program
the instrument.
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
klqb 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 the Model 6487 using the
SCPI language.
DDC language — The Model 6487 implements most DDCs (device-dependent com-
mands) available in the Keithley Model 487 picoammeter. The available commands are
provided in Appendix C. See the Model 487 Instruction Manual for details on operation.
The PDF of this manual is on the CD-ROM that was included with your shipment.
488.1 language — See Appendix E for details.
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