13-8 Remote Operations Models 2500 and 2502 User’s Manual
DCL (device clear)
Use the 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 Model 2500 receives a DCL command, it clears the Input Buffer and Output
Queue, cancels deferred commands, and clears any command that prevents the processing
of any other device command. A DCL does not affect instrument settings and stored data.
SDC (selective device clear)
The SDC command is an addressed command that performs essentially the same function
as the DCL command. However, since each device must be individually addressed, the
SDC command provides a method to clear only selected instruments instead of clearing all
instruments simultaneously, as is the case with DCL.
GET (group execute trigger)
GET is a GPIB trigger that is used as an arm event to control operation. The Model 2500
reacts to this trigger if it is the programmed arm control source. The following command
selects the GPIB arm control source:
:ARM:SOURce BUS
NOTE With :ARM:SOURce BUS selected and an :INITiate command sent, do not send
any commands (except GET, DCL, SDC, IFC, *TRG, and :ABORt) while per-
forming source and measure operations (ARM annunciator on). If you do,
erratic operation will occur.
SPE, SPD (serial polling)
Use the serial polling sequence to obtain the Model 2500 serial poll byte. The serial poll
byte contains important information about internal functions. See Section 14. Generally,
the serial polling sequence is used by the controller to determine which of several instru-
ments has requested service with the SRQ line. However, the serial polling sequence may
be performed at any time to obtain the status byte from the Model 2500.
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