Keithley 6482 - Remote Versus Local Operation; Local-To-Remote Transition; Remote-To-Local Transition; Selecting an Interface

12-2 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 12: Remote Operations Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Remote versus local operation
This topic summarizes remote operation enhancements and local-to-remote and remote-to-local
transitions.
Local-to-remote transition
When changing from local-to-remote operation, the following takes place:
• The Model 6482 stops taking readings and is placed into the idle layer of the trigger model.
• All menus are exited.
• All pending front-panel commands are aborted.
• The reading buffer is cleared; FETCh?, CALC1:DATA?, and CALC2:DATA? will not return
any data until the Model 6482 takes readings while in remote operation.
• All other settings remain unaffected, including TRACe buffer storage.
• Sources are placed in the FIXed mode.
Remote-to-local transition
When changing from remote-to-local operation, the following takes place:
• The Model 6482 stops taking readings and is placed into the idle layer of the trigger model.
• All user-defined displays are disabled.
• The display is re-enabled if it was previously turned off.
• Readings are continuously taken.
• Sources are placed in the FIXed mode.
Selecting an interface
The Model 6482 supports two built-in remote interfaces:
• GPIB (general purpose interface bus)
• RS-232 interface
You can use only one interface at a time. The factory interface selection is the GPIB bus. You can
select the interface only from the front panel. The interface selection is stored in nonvolatile
memory; it does not change when power has been off or after a remote interface reset.
The GPIB bus is the IEEE-488 interface. You must select a unique address for the Model 6482.
The address is displayed when the instrument is turned on. At the factory, the address is set to 25.
The IEEE-488 address can only be changed from the front panel while the IEEE-488 bus is
enabled.
The RS-232 interface is a serial interface. Programmable attributes of the RS-232 interface
include the following (factory default settings are shown in parentheses):
• Baud rate (9600)
• Data bits (8)
• Parity (none)
• Terminator (CR)
• Flow control (none)
RS-232 settings for baud rate, parity, and data bits are accessible only from the front panel while
RS-232 is enabled.