26 |
Sync_Clk_Out
Sync_Clk
Sync_Clk_In
6. Synchronization System
This chapter introduces the multi-card synchronization system of the PCI-5000 series data
acquisition device. The synchronization system has three ports, synchronization clock, external
trigger input and trigger output.
6.1.
Synchronous clock
Synchronization clock is the key signal to ensure the synchronization of multiple devices, which is
used to eliminate clock errors among multiple devices. The synchronous clock port of PCI-
2252/2253 data acquisition device can be set as input or output by software, and the default setting
for power-on is input. The circuit diagram of the synchronous clock port is shown in Figure 6.1.
Figure 6.1 The circuit diagram of the synchronous clock port
6.2.
External trigger input
External trigger input can realize synchronous triggering of multiple devices. The trigger source of
each function of the acquisition device can choose the external trigger input pin Trig_In as the trigger
source.
6.3.
trigger output
When the trigger signal of the specified function is set as the output source, the Trig _ out pin will
output a high-level pulse with a duration of 1us while the function is triggered.
The schematic circuit diagram of trigger output Trig_Out is shown in Figure 6.2. The following
sources can be selected as output options:
