Operations
23
PCIe-9529
Figure 3-4: External Digital Trigger
SSI_AD_TRIG
The PCIe-9529 utilizes SSI Bus Number 5 to act as a System
Synchronization Interface (SSI). With the interconnected bus
provided by SSI Bus, multiple modules are easily synched.
When configured as input the PCIe-9529 serves as a slave
module and can accept trigger signals from SSI Bus Number 5,
asserted from other PCIe-9529 modules. When configured as
output, the PCIe-9529 serves as a master module and can out-
put trigger signals to SSI Bus Number 5.
Analog Trigger
The PCIe-9529 analog trigger circuitry can be configured to
monitor one analog input channel from which data is acquired.
Selection of an analog input channel as the analog trigger
channel does not influence the input channel acquisition opera-
tion. The analog trigger circuit generates an internal digital trig-
ger signal based on the condition between the analog signal
and the defined trigger level.
Analog trigger conditions are as follows:
Z
Positive-slope trigger: The trigger event occurs when the
analog input signal changes from a voltage lower than
Pulse Width > 20ns
Pulse Width > 20ns
Rising edge trigger
event
Falling edge trigger
event
