Connecting The External Trigger I/O Signal - Contec DIG-100M1002-PCI User Manual

3. External Connection

Connecting the External Trigger I/O Signal

This section shows an example of how to connect external trigger I/O signals (post trigger input signals
and sampling clock input signal) using BNC cable.
User can use an optional BNC cable (BNC-Bxxx) to connect your external devices to BNC connector of
TRG.
External trigger I/O signal is the positive logical I/O.
These external trigger I/O signals are 3.3VLVTTL level not only for the input but also for the output.
The external trigger I/O signal also can be used as BNC connector of TRG.
Therefore, it can be only used as either the input or the output.
Switching I/O can be done by the software.
3.3V
BOARD
SN74LVC245A
50Ω
Digital Ground
Figure 3.5. Connecting the External Trigger Input
3.3V
BOARD
SN74LVC245A
50Ω
Digital Ground
Figure 3.6. Connecting the External Trigger Output
CAUTION
- Do not connect any output signal to the analog or digital ground. Do not interconnect outputs.
Doing either can cause a malfunction.
- The signal input of 5VTTL/5VCOMOS is possible.
- The input is the default at startup.
Reference
For the operation timings for trigger I/O signal, see "Timing for Control Signal" in Chapter 6
"About Hardware".
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TRG
Shield cable
10kΩ
Trigger
Input
TRG
Shield cable
10kΩ
Trigger
Output
Target
Target
DIG-100M1002-PCI