Additional Information. Refer to example 'Simple Serial' for an example of using the VISA Configure Serial Port VI.The example is accessible in Hardware Input and Output-Serial in the Example Finder (Finding Examples for LabVIEW - NI Example Finder). Jul 18, 2019 Error - is a framing error. Serial data is transferred one byte at a time. Each byte has a specific format with a start bit, data bits, parity, and stop bits. A framing error occurs when a byte of data is received, but it is not in the format expected. My 'negative' comments are'nt so much about your code. More about the serial implementation of VISA. The fact that once you are in a 'read' you are stuck until it times out (not even the vi stop button will have an effect) means that you are forced into checking bytes at port and re-implementing the timeout.
1. Overview of Serial Bus
Serial is a common device communication protocol for instrument control because most computers and many remote instruments include at least one serial port. Single applications can be used across a variety of instruments with few modifications, reducing programming and test time.
For more information on the serial protocol, including information on transfer speeds and important parameters, please refer to Serial Communication Overview.
2. Connecting and Setting up a Serial Instrument Control System
Engineers typically use serial to transmit American Standard Code for Information Interchange (ASCII) data. All data types are converted to strings of ASCII characters and then transmitted bit by bit across the serial bus. For two ports to communicate, both the instrument and the controlling computer must have the same baud rate, data bit size, stop bits, and parity.
A basic serial instrument control system consists of three parts:
1. PC (or controller) with a serial port
2. Serial cable
3. Serial instrument
As mentioned, most computers include a serial port. Procomm plus for windows 10. The only hardware setup required is connecting the serial cable to the serial port on the PC and the serial port on the instrument. The serial instrument may include some hardware drivers or software utilities for communication, and should include documentation on the baud rate, packet size, stop bits, and parity bits that the instrument will use. Additionally, check the National Instruments Instrument Driver Network to see if LabVIEW drivers already exist for your instrument, as well has tutorials on how to use them.
To confirm that the serial port on your computer is working properly, refer to Serial Communication Starting Point, to see how to perform a serial loop back test.
3. How to Create a VISA Resource for the Instrument in MAX
With NI-VISA, communicating with your serial instrument is easy. To confirm that you are able to communicate with your instrument, open Measurement & Automation Explorer (MAX) found at Start>>Programs>>National Instruments>>Measurement & Automation.
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Figure 1. MAX Main Menu
Expand the Devices and Interfaces subdirectory below My System. Below it you should see all the serial and parallel ports on your computer. In this example the computer has one serial port (“COM3”). Figure 2 shows the directory path to the serial port and the configuration window when COM1 is selected.
Figure 2. Serial Port Configuration Window
From this configuration window you can change the VISA Alias for easier identification and you can also communicate with your instrument through a VISA Test Panel by selecting Open VISA Test Panel. Your instrument should have specific commands for collecting and transmitting data and you can use the VISA Test Panel to test these functions and verify that they are working properly.
Using NI-VISA to Communicate with Your Serial Instrument
NI-VISA makes serial instrument programming fast and easy. VISA Open, VISA Read, VISA Write, and VISA Close are the basic VISA functions in LabVIEW used in the example VI in Figure 3. This example opens a VISA session to a serial device. A command is written to the device, and the response is read back. In this example the specific command being sent is the ID query for the device. Check with your device manufacturer for your device command set. After all communication is complete, the VISA session is closed.
Figure 3. LabVIEW Serial Program Using NI-VISA
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NI-VISA provides built in serial examples to assist users with application design and development.
- Serial examples for LabVIEW can be found the in LabVIEW Example Finder by navigating to Help>>Find Examples>>Hardware Input and Output>>Serial. The Readme file for each NI-VISA version provides more information on where to find LabVIEW Serial examples.
- Serial examples for .NET, C and VB6 can be found by navigating to Start>>All Apps>>National Instruments>>NI-VISA Examples.