8: Triggering 2470 High Voltage SourceMeter Instrument
8-4 2470-901-01 Rev. A / May 2019
Triggering using hardware lines
You can use the digital I/O lines and TSP-Link
®
synchronization lines to synchronize the operations of
the 2470 with those of external instruments. You can use these lines to synchronize the 2470 with
other TSP-enabled instruments, including other 2470 instruments. You must use the digital I/O lines
to synchronize the 2470 with other Keithley products or other non-Keithley products.
The lines are configured and controlled similarly. See Digital I/O (on page 8-12),
TSP-Link System
Expansion Interface (on page 9-1), and Connecting the 2470 to a Trigger Link system (on page 8-22)
for more information about connections and configuration and control of the lines.
LAN triggering overview
You can send and receive triggers over the LAN interface. The 2470 supports LAN extensions for
instrumentation (LXI). It has eight LAN triggers that generate and respond to LXI trigger packets.
Understanding hardware value and pseudo line state
LAN triggering and hardware synchronization are similar, except that LAN triggering uses LXI trigger
packets instead of hardware signals. A bit in the LXI trigger packet called the hardware value
simulates the state of a hardware trigger line. The 2470 stores the hardware value as the pseudo-line
state. Only the state of the last LXI trigger packet that was sent or received is stored.
The stateless event flag is a bit in the LXI trigger packet that indicates if the hardware value should be
ignored. If it is set, the 2470 ignores the hardware value of the packet and generates a trigger event.
The 2470 always sets the stateless flag for outgoing LXI trigger packets. If the stateless event flag is
not set, the hardware value indicates the state of the signal.
The instrument interprets changes in the hardware value of consecutive LXI trigger packets as edge
transitions. Edge transitions generate trigger events. If the hardware value does not change between
successive LXI trigger packets, the 2470 assumes an edge transition was missed and generates a
trigger event. The following table shows edge detection in LAN triggering.
LXI trigger edge detection
Stateless event
flag
Hardware
value
Pseudo-line
state
Falling edge Rising edge
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