Specifications

Operating Manual SEFRAM 4451
M4451 A00
57
Syntax: :TRIGger:SLOPe?
Examples: :TRIG:SLOP?
Response: POS | NEG
4.12.4 Status Subsystem
This subsystem controls the SCPI-defined status reporting structures, which are the
QUEStionable and OPERation status registers, and the error/event queue. The QUEStionable
and OPERation status registers are mandated by SCPI, and so are implemented, but are not used
by the hardware. No status is ever reported through them, and they are not detailed in this
manual. The following shows the STATus structure used:
:STATus
:PRESet
:QUEue
[:NEXT]?
4.12.4.1 Status Preset
This command is used to set certain status values to defined values.
 The OPERation and QUEStionable enable registers are cleared.
 The Positive transition filters are set to 32767.
 The Negative transition filters are set to 0.
Since the Questionable and Operation status registers are not used in the SEFRAM 4451, the
PRESet command has no real effect.
COMMAND TYPE: Setting only
SETTING
Syntax: :STATus:PRESet
4.12.4.2 Error Queue Read
This query returns the first entry in the error queue and removes that entry from the queue. Its
function is identical to that of the :SYSTem:ERRor? query.
COMMAND TYPE: Query only
QUERY
Syntax: :STATus:QUEue[:NEXT]?
Response: <error number>,
“<error description>“
4.12.5 System Subsystem
The SYSTem subsystem collects the functions that are not related to instrument performance.
The functions implemented in the SEFRAM 4451 are security, GPIB address changing, error
queue reading, SCPI version reading, and power-on buffer setting (not SCPI-defined). The
command structure is as follows:
:SYSTem
:COMMunicate
:GPIB
:ADDRess <numeric value>
:ERRor?
:VERSion?
:SECurity
[STATe] <Boolean>
:POBuffer <numeric value>
4.12.5.1 GPIB Address Change
This command is used to set the GPIB address. Setting the address to 31 puts the instrument in
an 'off-bus' state, in which it does not take part in communication over the GPIB.