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IEEE-488 Reference

3-82

The :OPEN? <list> query command is used to determine the state (opened or not opened) of

each channel speciﬁed by the list parameter. For this command, the chanlist can consist of mul-

tiple channels. See the :CLOSe command for examples to express a chanlist.

After sending this query command and addressing the Model 6517A to talk, the values for the

speciﬁed channels are sent to the computer. A value of "1" indicates that the channel is open,

and a "0" indicates that the channel is not open.

3.18.3 :OPEN:ALL :ROUTe:OPEN:ALL Open closed channel

This action command is used to open a closed channel on the internal scanner card. Note that

this command performs the same function as the :ROUTe:OPEN ALL command that was pre-

viously discussed.

3.18.4 :SCAN commands

[:INTernal] <list>

:ROUTe:SCAN[:INTernal] <list> Deﬁne internal scan list and enable scan.

Parameters <list> = (@ scanlist)

where; scanlist is the speciﬁed list of channels (1 to 10) to be scanned.

Query [:INTernal]? Query programmed scan list

Description This command is used to deﬁne the scan list for the internal scanner card. The scan list can con-

tain 2 to 10 channels. The following examples demonstrate the various forms for expressing a

scan list:

list = (@ 2,4,6) Channels separated by commas (,).

(@ 1:8) Range of channels (1 though 8). Range limits separated by a colon (:).

(@ 1:5,7) Range entry and single entry separated by a comma.

Refer to Section 2 of this manual and the instruction manual for the scanner card for details on

scanning.

:EXTernal <n>

:ROUTe:SCAN:EXTernal <n> Specify number of external channels

Parameters <n> = 1 to 400 Specify number of external channels

DEFault 10 external channels

MINimum 1 external channel

MAXimum 400 external channels

Query :EXTernal? Query programmed number of external channels

:EXTernal? DEFault Query *RST default channel number value

:EXTernal? MINimum Query minimum channel number value

:EXTernal? MAXimum Query maximum channel number value

Keithley 6517A User Manual

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