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Operating and Programming 3
L4400 User’s Guide 71
• If a scan includes a read of the totalizer, the count is reset each time it is
read during the scan only when the totalizer reset mode is enabled.
• At the end of the scan, the last channel that was scanned will be opened
(as well as any Analog Bus relays used during the scan).
Any channels that were opened during the scan will remain open at
the completion of the scan.
• If you abort a scan that is running, the instrument will terminate any
reading in progress (readings are not cleared from memory). If a scan is in
progress when the command is received, the scan will not be completed
and you cannot resume the scan from where it left off.
Note that if you initiate a new scan, all readings are cleared from memory.
• The Monitor mode is automatically enabled on all channels that are part
of the active scan list (see “Monitor Mode" on page 80).
• The present scan list is stored in volatile memory and will be lost when
power is turned off or after a Factory Reset (*RST command).
Creating the Scan List
Usage:
• L4421A 40- Channel Armature Multiplexer
• L4450A 64- Bit Digital I/O (digital input, counter channels only)
• L4452A Multifunction Module (digital input, totalizer channels only)
A scan list is created as follows:
• Use the ROUTe:SCAN command to define the list of channels in the scan
list. To determine what channels are currently in the scan list, use the
ROUTe:SCAN? query command.
• To add channels to the present scan list, use the ROUTe:SCAN:ADD
command. To remove channels from the present scan list, use the
ROUTe:SCAN:REMove command.
• To remove all channels from the scan list, send “ROUT:SCAN (@)”.
• To initiate a scan, use the INITiate or READ? command. Each time you
initiate a new scan, the instrument will clear the previous set of readings
from memory.
To stop a scan in progress, use the ABORt command.