Keithley 2651A Reference Manual page 158

Model 2651A High Power System SourceMeter® Instrument Reference Manual
LXI trigger edge detection
Stateless event
flag
0
0
0
0
1
Set the LAN trigger mode to configure edge detection method in incoming LXI trigger packets. The
mode selected also determines the hardware value in outgoing LXI trigger packets. The following
table lists the LAN trigger modes.
LAN trigger modes
Trigger mode
Either edge
Falling edge
Rising edge
RisingA
RisingM
Synchronous
SynchronousA
SynchronousM
The programming example below illustrates how to configure the LAN trigger mode:
-- Set LAN trigger 2 to have falling-edge mode.
lan.trigger[2].mode = lan.TRIG_FALLING
Understanding LXI trigger event designations
LAN trigger objects generate LXI trigger events. The LXI standard designates trigger events as LAN0
to LAN7 (zero based). In the command table, the LXI trigger events can be accessed using
lan.trigger[1] through lan.trigger[8]. lan.trigger[1] corresponds to LXI trigger event
LAN0 and lan.trigger[8] corresponds to LXI trigger event LAN7.
Generating LXI trigger packets
The Model 2651A can be configured to output an LXI trigger packet to other LXI instruments. To
generate LXI trigger packets, you must first call the lan.trigger[N].connect() function. Select
the event that triggers the outgoing LXI trigger packet by assigning the specific event ID to the LAN
stimulus input.
2651A-901-01 Rev. A / March 2011
Hardware Pseudo line state Falling edge
value
0 0
1 0
0 1
1 1
- -
Input detected Output generated
Either Negative
Falling Negative
Rising Positive
Rising Positive
Rising Positive
Falling Positive
Falling Positive
Rising Negative
Rising edge
Detected Detected
- Detected
Detected -
Detected Detected
Detected Detected
Notes
Same as Rising
Same as Rising
Same as SynchronousA
Section 3: Functions and features
3-51