Datasheet

8
Triggering using Star trigger bus
The U2781A comes with a Star trigger bus, which offers precise synchronization
between USB modular products and the external trigger signal. The star trigger
bus provides dedicated trigger lines between the external trigger input and slotted
USB modules. You can also achieve precise triggering between each USB modular
product via the synchronized routing of the star trigger.
System option
The U2781A USB modular product chassis has a mountable rackmount kit, which
can be ordered separately (see “Optional Accessories” on page 8). This allows for a
better setup when the U2781A is integrated into a test system.
Simultaneous Synchronization Interface (SSI) capability
The table below shows the USB modular products triggering capability.
Modular products Congure as Master
1
Congure as Slave
2
U2300A Series Yes Yes
U2500A Series Yes Yes
U2600A Series Yes Yes
U2701A/U2702A
3
Yes Yes
U2722A/U2723A
3
Yes
4
Yes
U2741A
No Yes
U2751A
No
No
U2761A Yes Yes
High-density data
acquisition
The U2781A chassis increases the
number of available channels when
any U2300 Series, U2500 Series, or
U2600 Series products are slotted into
the chassis. For example, when you
slot six U2331A Series products in the
chassis, it allows for an expansion of
up to 384 channels, providing a high-
density data acquisition solution.
Internal and external
10 MHz reference clock
The U2781A is equipped with a 10
MHz reference clock. It is used to
synchronize the timebase of the USB
modular products slot into the chassis
for more precise measurements.
Simultaneous
Synchronization Interface
(SSI)
SSI provides synchronization between
the modular products in the chassis by
allowing the modules to be configured
as Master or Slave. The Master module
sends the SSI signal to the Slave
module via the backplane trigger bus.
Then, the Slave module receives the
signal and begins synchronization with
the Master module. There are two SSI
configuration modes available — single
Master-multiple Slaves and multiple
Masters-multiple Slaves. Please refer
to the Keysight U2781A USB Modular
Product Chassis User’s Guide for more
information.
1
The Master module sends the SSI trigger-out signal to the Slave module via the backplane
trigger bus.
2
The Slave module receives the SSI trigger-in signal and begins synchronization with the
Master module.
3
U2722A/U2723A cannot trigger U2701A/U2702A and vice versa.
4
Triggering can only be done through SCPI command.