Use DAQmx Counter Input to Trigger VISA Serial Acquisition

[A_Ryan]

Overview

This example uses a counter input to trigger a serial acquisition. When the counter detects a digital event, the specified string command is written to the serial port and a serial read is executed.

Description

Serial commands are typically software-timed, sent every iteration of a loop.  By importing a sample clock, the serial commands can be synchronized with external acquisitions based on hardware timing.  Each time the external sample clock strikes, an event is registered and each event triggers a serial acquisition.

Requirements

Software

• LabVIEW 8.6 or compatible
• NI-VISA driver compatible with the version of LabVIEW
  
• NI-DAQmx 8.7.2 or compatible

Hardware

• PC Serial port or NI Serial Device
• NI DAQ hardware with at least one counter

Steps to Implement or Execute Code

1. Configure the physical channel, source of events, and VISA resource on the front panel
2. Configure the serial parameters on the front panel to match the serial parameters of your device
   
3. Specify the VISA command to be written in the string to write control on the front panel
   
4. Run the VI
5. Observe the  events received, bytes read, and the read string on the front panel
   

Additional Information or References

Block Diagram

**This document has been updated to meet the current required format for the NI Code Exchange.**

[Todd S.]

Great stuff!