Front-Panel Gpib Operation - Keithley 2601B Reference Manual

Series 2600B System SourceMeter® Instrument Reference Manual
DCL
Use the device clear (DCL) command to clear the GPIB interface and return it to a known state. Note
that the DCL command is not an addressed command, so all instruments equipped to implement DCL
will do so simultaneously.
When the Series 2600B receives a DCL command, it:
•
Clears the input buffer, output queue, and command queue
•
Cancels deferred commands
•
Clears any command that prevents the processing of any other device command
A DCL does not affect instrument settings and stored data.
SDC
The selective device clear (SDC) command is an addressed command that performs essentially the
same function as the device clear (DCL) command. However, because each device must be
individually addressed, the SDC command provides a method to clear only selected instruments,
instead of clearing all instruments simultaneously with the DCL command.
When the Series 2600B receives an SDC command, it:
•
Clears the input buffer, output queue, and command queue
•
Cancels deferred commands
•
Clears any command that prevents the processing of any other device command
An SDC does not affect instrument settings and stored data.
GET
The group execute trigger (GET) command is a GPIB trigger that triggers the instrument to take
readings from a remote interface.
SPE, SPD
Use the serial polling sequence to obtain the Series 2600B serial poll byte. The serial poll byte
contains important information about internal functions (see
1)). Generally, the serial polling sequence is used by the controller to determine which of several
instruments has requested service with the SRQ line. The serial polling sequence may be performed
at any time to obtain the status byte from the Series 2600B.

Front-panel GPIB operation

This section describes aspects of the front panel that are part of GPIB operation, including messages,
status indicators, and the LOCAL key.
Error and status messages
The front-panel display may show error and status messages (see
messages
messages that are associated with IEEE-488 programming. The instrument can be programmed to
generate an SRQ, and command queries can be performed to check for specific error conditions.
2600BS-901-01 Rev. B / May 2013
(on page 2-82)). See Error summary list
Section 2: General operation
Status model (on page 5-14, on page E-
Displayed error and status
(on page 8-3) for a list of status and error
2-107