Keithley 7012-S, Instruction Manual, Page: 50 / 93

Operation
4-4
4.3.2 Front panel control
Closing and opening channels
A matrix crosspoint is closed form the front panel by
simply keying in the channel assignment and pressing
CLOSE. For example, to close Row 3, Column 4 cross-
point of a matrix card installed in slot 2, key in the fol-
lowing channel list and press CLOSE:
SELECT CHANNELS 2!3!4
The above closed channel can be opened by pressing
OPEN or OPEN ALL. The OPEN key opens only the
channels speci
Þ ed in the channel list, and OPEN ALL
opens all channels.
The following display is an example of a channel list
that consists of several channels:
SELECT CHANNELS 2!1!1, 2!1!3, 2!2!1-2!2!5
Notice that channel entries are separated by commas
(,). A comma is inserted by pressing ENTER or the right
cursor key (
). The channel range is speci Þ ed by us-
ing the hyphen (-) key to separate the range limits.
Pressing CLOSE will close all the channels speci
Þ ed in
the channel list. Pressing OPEN (or OPEN ALL) will
open the channels.
Scanning channels
Matrix crosspoints are scanned by creating a scan list
and con
Þ guring the Model 7001 to perform a scan. The
scan list is created in the same manner as a channel list
(see Closing and Opening Channels). However, the
scan list is speci
Þ ed from the “SCAN CHANNEL” dis-
play mode. (The SCAN LIST key toggles between the
channel list and scan list.) The following shows an ex-
ample of a scan list:
SCAN CHANNELS 2!1!1, 2!1!3, 2!2!1-2!2!5
When a scan is performed, the channels speci Þ ed in the
scan list will be scanned in the order that they are pre-
sented in the scan list.
A manual scan can be performed by using the RESET
default conditions of the Model 7001. RESET is selected
from the SAVESETUP menu of the main MENU. When
RESET is performed, the mainframe is con
Þ gured for
an in Þ nite number of manual scans. The Þ rst press of
STEP takes the mainframe out of the idle state. The
next press of STEP will close the
Þ rst channel speci Þ ed
in the scan list. Each subsequent press of STEP will se-
lect the next channel in the scan list.
4.3.3 IEEE-488 bus operation
Bus operation is demonstrated using HP BASIC 4.0.
The programming statements assume that the primary
address of the mainframe is 07.
Closing and opening channels
The following SCPI commands are used to close and
open channels:
:CLOSe <list>
:OPEN <list>|ALL
The following statement closes channels 1!1!1, and
1!1!3 through 1!1!6:
OUTPUT 707; “:clos (@ 1!1!1, 1!1!3:1!1!6)”
Notice that the colon (:) is used to separate the range
limits.
Either of the following statements will open channels
1!1!1, and 1!1!3 through 1!1!6:
OUTPUT 707; “:open (@ 1!1!1, 1!1!3:1!1!6)”
OUTPUT 707; “:open all”
Scanning channels
There are many commands associated with scanning.
However, it is possible to con
Þ gure a scan using as lit-
tle as four commands. These commands are listed as
follows:
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com