Keithley 708B Reference Manual page 184

Models 707B and 708B Switching Matrix Reference Manual
Relay setup commands
The following table shows DDC commands that refer to Model 707A and 708A relay setups. The
Model 707B or 708B equivalent of relay setups are called scans and patterns.
Scans allow a predetermined set of channels to be closed in a sequential order based on a particular
event or combination of events. For more information, see
There are some distinct differences between relay setups and scans:
•
Scans can only be accessed sequentially. Unlike relay setups, you cannot specify an alternate
starting location.
•
You can only retrieve scan lists in string format.
•
You can only append steps to scans — you cannot insert scan steps before steps that are
already in the scan list.
•
You cannot remove scan steps from the scan list.
The correlation to scanning holds true for DDC commands In, En, E0, Lbbbb, Pn, and Qn, while the
DDC commands Z0,n, Zn,0, and Zm,n resemble patterns on the Model 707B or 708B instrument.
Patterns allow several channels to be associated by a name, and any operation that occurs to the
pattern (such as close or open) happens to each channel in the pattern. For more information, see
Channel patterns
Scanning trigger
DDC
En
E0
Lbbbb
Pn
Qn
Z0,n
Zn,0
Zm,n
In
Disable or enable the scan event trigger
When enabling external triggering on the Model 707A or 708A instruments, there were two possible
trigger sources, the external trigger line or a GPIB Get command. The Model 707B or 708B has
multiple trigger events that are available to iterate through a scan list. The following table shows that
specifying a scan event trigger automatically enables it. For more information, see Scanning and
triggering.
Scanning trigger
DDC TSP equivalent command
F0 scan.trigger.channel.stimulus = 0
F1 scan.trigger.channel.stimulus = eventID
707B-901-01 Rev. A / August 2010
(on page 2-99).
TSP equivalent command
No corresponding command
No corresponding command
print(scan.list())
No corresponding command
scan.create("")
channel.pattern.snapshot("patternName")
channel.close("patternName")
channel.pattern.setimage(pattern1, pattern2)
No corresponding command
Section 5: Remote commands
Scanning and triggering
Description
Point to present relay setup
Point to stored relay setup
Download setups
Clear relay setup
Delete setup
Copy present relays to n
Copy setup from n to relays
Copy setup from m to n
Insert blank setup to mem
Description
Disable scanning trigger
Enable scanning trigger
(on page 3-1).
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