User manual

IEEE-488 Reference
2001-900-01 Rev. K / August 2010 4-91
Defaults Power-up All channels open
*RST No effect
:SYSTem:PRESet No effect
Query :CLOSe? <list> Query specified channel.
Short-form format: :rout:clos? <list>
where; chanlist is the list of channels to be queried.
Response message: 1 (Specified channel is closed)
0 (Specified channel is not closed)
Description The :CLOSe <list> command is used to close a channel on the Model 2001-SCAN scanner card. Only
one channel can be closed at a time. Thus, for this command, the chanlist must consist of only one chan-
nel. When this command is sent, any other closed channel will first open and then the specified channel
will close. Sending more than one channel parameter will result in an error.
For example, to close channel 5, send the following command:
:rout:clos (@ 5)
The :CLOSe? <list> query command is used to determine the state (closed or not closed) of each channel
specified by the list parameter. For this command, the chanlist can consist of multiple channels. The fol-
lowing examples demonstrate the various forms for expressing the channel list for this query command:
List = (@ 2) Single channel.
(@ 2,4,6) Multiple channels separated by commas (,).
(@ 1:10) Range of channels (1 though 10). Range limits separated by a colon (:).
(@ 1:5,7) Range entry and single entry separated by a comma.
After sending this query command and addressing the Model 2001 to talk, the values for the specified
channels will be sent to the computer. A value of “1” indicates that the channel is closed, and a “0” indi-
cates that the channel is not closed.
For example, assume channel 5 is closed and the following query command is sent:
:rout:clos? (@ 1:10)
After the addressing the Model 2001 to talk, the following response message will be sent to the computer:
0, 0, 0, 0, 1, 0, 0, 0, 0, 0
NOTE: Sending the :CLOSe or :CLOSe? command with the scanner card missing will result in an error.
Programming example This example assumes that the Model 2001 SCAN is installed.
10 OUTPUT 716; “:rout:clos (@ 10); clos? (@ 1:10)”
20 ENTER 716; A$
30 PRINT A$
40 END
Line 10 Two commands in this program message; the first closes channel 10, and the second queries
all 10 channels.
Line 20 Addresses the Model 2001 to talk.