Keithley 2010 User Manual page 171

:CLOSe:STATe?
:ROUTe:CLOSe:STATe?
Description
The response message for this query command indicates the channel (or
channel pair) that has been closed on the internal scanner card using the
:rout:close <chan num> command (or channels closed from the front panel).
Note that for 4-pole operation, the paired channel is not included in the
response message. For example, if channel pair 4 and 9 has been closed, the
(@4) response message will be returned.
NOTE For 4-pole operation, the rout:mult:close? query command includes the paired
channel in the response message (see "Multiple channel control").
The rout:close? query command will not indicate channels that have been closed
using the rout:mult:close <list> command (see "Multiple channel
control").
Channels cannot be closed if a scan (internal or external) is presently enabled. See
the :LSELect <name> command in "Scan commands" to disable scan operations.
:OPEN:ALL
:ROUTe:OPEN:ALL
Description
This command is used to open all input channels (1 through 10) on the
internal scanner card.
The only channel this command will not open is channel 11. This channel is
the 2-pole/4-pole relay and is controlled by the multiple channel commands.
See "Multiple channel control" for details on controlling channel 11.
Sending rout:open:all disables scan operation (sets :LSELect to NONE; see
"Scan commands").
SCPI Command Reference
Query closed channel or channel pair
Open all input channels
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