Keithley 3700 series Reference Manual page 308

Section 9: Instrument Control Library (ICL)
scan.mode
Attribute
Usage
Remarks
Also see
Example
9-164
Use to set or query the scan.mode value.
To read the scan.mode value:
init = scan.mode
init: The present scan.mode setting
To write the scan.mode value:
scan.mode = init
init: The desired value of set the scan.mode setting. Use one of the following:

scan.MODE_OPEN_ALL or 0: indicates if an openall on all slots should be
performed before a scan executes (default setting).

scan.MODE_OPEN_SELECTIVE or 1: indicates that an intelligent open takes
place (see remarks)

scan.MODE_FIXED_ABR or 2: this setting is equivalent to
MODE_OPEN_SELECTIVE plus the following:
-close all required backplane relays before start of scan
-does not open or close these backplane relays during the scan
-does not open these backplane relays at the end of scan
This attribute, when set to scan.MODE_OPEN_ALL, indicates an openall on all slots
should be performed before a scan executes. Otherwise, when
scan.MODE_OPEN_SELECTIVE, an intelligent open takes place as follows:
If all steps being scanned have a function value of "nofunction" with their DMM
configuration then:

Open all channels and backplane relays involved in scanning.

If a closed channel or backplane relay is not involved in scanning it will remain
closed during the scan.
If any step has a DMM configuration with a function set to something other than
"nofunction" then:

Open analog backplane relays 1 and 2 on all slots.

Open any common side ohms backplane relays on all slots.

Open any amps channels on all slots.

Open all channels and backplane relays involved in scanning.

If a closed channel or backplane relay is not involved in scanning it will remain
closed during the scan.
If this count is set to zero, the Series 3700 will perform no measure action or sequence
event detection.
The reset value as well as the default setting for this attribute is
scan.MODE_OPEN_ALL.
scan.reset (on page 9-166)
To set the scan.mode setting for scan to off:
scan.mode = scan.OFF
Series 3700 System Switch/Multimeter Reference Manual
Document Number: 3700S-901-01 Rev. A / August 2007