Keithley 2750, User Manual, Page: 74 / 452

Model 2750 Multimeter/Switch System User’s Manual Close/Open Switching Module Channels 2-19
Reference:
a. ROUTe:MULTiple:CLOSe <clist>
This command functions like the front panel CLOSE key (MULTI menu option) to
close channels. When you send this command to close the channels specified in the
<clist>, only those listed channels will close. Channels not specified are not
affected, and channel pairing is disabled.
NOTES
Channels closed by ROUT:MULT:CLOS are not displayed.
The ROUT:MULT:CLOS command cannot be used to perform
thermocouple temperature measurements using the internal or
external reference junction. The simulated reference junction will
instead be used and the integrity of the temperature reading will be
questionable (“ERR” annunciator on). See
“Temperature
measurements,” page 3-25 , for details.
NOTE For RS-232 operation (and in some cases, GPIB operation), *OPC
or *OPC? should be used with :ROUT:MULT:CLOS if the <clist> is
large. Details on *OPC and *OPC? are provided in
Section 12 .
b. ROUTe:MULTiple:OPEN <clist>
With this command, you can open one or more switching module channels. When
you send this command to open the channels specified in the <clist>, only those
listed channels will open. Channels not specified are not affected.
NOTE
For RS-232 operation (and in some cases, GPIB operation), *OPC
or *OPC? should be used with :ROUT:MULT:OPEN if the <clist>
is large. Details on *OPC and *OPC? are provided in
Section 12 .
c. ROUTe:OPEN:ALL
This command functions the same as the front panel OPEN key (ALL menu
option). It simply opens all channels (including non-measurement channels) in the
mainframe.
d. ROUTe:MULTiple:CLOSe?
This query command returns a <clist> of all closed channels, including
non-measurement channels and paired channels for 4-wire functions.
e. ROUTe:MULTiple:CLOSe:STATe? <clist>
This query returns a “0” (open) or “1” (closed) for every channel specified in the
<clist>. It is valid for both measurement and non-measurement channels.
For example, assume channel 125 is closed, and you use this command to query
channels 101, 104, and 125 (<clist> = (@101, 104, 125)). The response message
returns “0, 0, 1” to indicate that channels 101 and 104 are open, and channel 125 is
closed.
2750-900-01.book Page 19 Wednesday, August 3, 2011 7:56 AM