Rules for Using scan_list and ch_list Parameters
Before you can initiate a scan, you must set up a scan list to include all
desired multiplexer or digital channels. Channels which are not in the
list are skipped during the scan. The instrument automatically scans
the list of channels in ascending order from slot 100 through slot 300.
• Commands which accept a scan_list parameter will reprogram
the scan list each time you send the command to the instrument.
The scan_list parameter is never an optional parameter.
• Commands which accept an optional ch_list parameter do not
reprogram the scan list when you send the command to the instrument.
If you omit the ch_list parameter, the command will be applied to the
channels in the active scan list.
• If a command specifies an illegal operation on a given channel,
the instrument will generate an error for each channel which is
illegal and the command will not be performed on any of the channels.
For example, the following command will generate an error on
channel 121 on the HP 34901A module since this channel is for
current measurements only.
CONFigure:VOLTage:DC (
@101,121)
• If you select a range of channels in a command which specifies an
illegal operation on one or more channels, the instrument will skip
the illegal channels and will not generate an error. For example,
the following command will not generate an error on the HP 34901A
module even though channels 121 and 122 are for current
measurements only.
CONFigure:VOLTage:DC (
@101:220)
However, if the illegal channel is one of the end points in the range,
the instrument will generate an error. For example, the following
command will generate an error on the HP 34901A module since
channel 122 is for current measurements only.
CONFigure:VOLTage:DC (
@101:122)
Chapter 5 Remote Interface Reference
SCPI Command Summary
182
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