1257 User Manual
SCPI Command Basics 5-40
EADS North America Defense
Test and Services, Inc.
©
2001
lockout mode. In either case, the 1257 will always power-up in
local mode. In manual lockout mode, the SYSTEM:KLOCK ON
command must be explicitly issued to prevent local operations. In
automatic lockout mode, any remote command detected by the
1257 puts the instrument in remote mode with lockout mode
automatically enabled. To allow local access, the 1257 must
receive a SYSTEM:KLOCK OFF command or experience a power
cycle event.
To make a lockout election from the user interface, select
-----SETTINGS-----
on the top most line, select
Type: Display
on the second line, and
Option: Lockout
from the third line and then choose the appropriate setting. The
default power-up state of the instrument is automatic mode
disabled. To elect a different power-up state, this setting like all
other menu options can be saved to non-volatile memory. For
further details on front-panel usage refer to
Chapter 3: USING
THE FRONT PANEL CONTROLS
.
Non-Volatile Update
The syntax for this command is shown below:
:SYSTem
:NVUPD
:NVUPD?
The SYSTEM:NVUPD and SYSTEM:NVUPD? query are used to
both initiate and determine whether a non-volatile update cycle is
in progress.
To improve system reliability and eliminate the need for batteries,
the 1257 stores configuration information into flash memory. The
downside of flash memory is that it updates more slowly than
battery-backed memories.
To minimize the effects of the flash memory update cycle, the 1257
allows individual selections (i.e. include list, exclude lists, path
names, menu selections, etc) to be instantaneously saved into
intermediate volatile memory. When all of these intermediate
operations are completed, the SYSTEM:NVUPD command starts
the actual process of transferring the contents of intermediate
volatile memory into non-volatile flash memory with a single,
slower update.
For example, the command:
SYST:NVUPD
Summary of Contents for 1257
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