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80 L4400 User’s Guide
3 Operating and Programming
• If you define a scan list with the sequential mode enabled and later
disable the mode, the scan list will not be reordered; however, the scan list
will be treated as a non- sequential list thereafter.
• If you have defined a scan list with the sequential mode disabled (OFF)
and later enable the mode, the channels will be reordered.
• Non- sequential scan lists are not stored as part of the instrument state by
the *SAV command; in this case, the ordered mode will be enabled and the
scan list will be empty when the instrument state is restored (*RCL
command).
• The scan order setting is stored in volatile memory and the ordered mode
will be enabled when power is turned off or after a Factory Reset (*RST
command).
The command used to control the order of the scan list is:
ROUTe:SCAN:ORDered {OFF|ON}
Monitor Mode
Usage:
• L4450A 64- Bit Digital I/O (digital input, counter channels only)
• L4452A Multifunction Module (digital input, totalizer channels only)
In the Monitor mode, the instrument takes readings as often as it can on a
single channel or during a scan. This feature is useful for troubleshooting
your system before a test or for watching an important signal.
• Any channel that can be “read” by a device can be monitored. This
includes the digital input, totalizer, and the counter channels.
• Readings acquired during a Monitor are not stored in memory. However,
all readings from a scan in progress at the same time are stored in
memory.
• The Monitor mode is equivalent to making continuous measurements
on a single channel with an infinite scan count. Only one channel can be
monitored at a time but you can change the channel being monitored at
any time.
• A scan in progress always has priority over the Monitor function.
• Channels do not have to be part of an active scan list to be monitored;
however, the channel must be configured for a measurement in order to be
monitored.
• The Monitor mode ignores all trigger settings and takes continuous
readings on the selected channel using the IMMediate (continuous)
source.