The serial port in the visa test panel under LabVIEW or max does not work

LabVIEW or MAX Under the VISA The serial port in the test panel cannot work

What serial devices work in HyperTerminal , But not here. LabVIEW or Measurement& Automation Explorer (MAX) Under the VISA Work in the test panel ？

answer : The serial port device may work in the HyperTerminal but not in the LabVIEW or MAX Under the VISA There are two reasons for working in the test panel ： Different terminators and character transmission speeds . Use the following methods to solve the problems related to these two reasons .

Ensure that HyperTerminal and LabVIEW Match the terminator used in

In general , The HyperTerminal adds a group after each message it sends \r\n, It corresponds to a carriage return followed by a line feed .

stay LabVIEW Character type input and display control can be used in \ Code display item to check whether the terminator is consistent . for example , have access to loopback The test method （ About loopback For test instructions, please refer to... In the following link NI Developer's Guide ） Send a string from the HyperTerminal , And then in LabVIEW Read back in . This will help determine what terminators are used by the HyperTerminal . then , Again using loopback test , from LabVIEW The same string is emitted in the and in LabVIEW Read back in . Comparing these values will determine whether the terminators match .

Reduce the speed of sending command strings to devices .（ If the serial port device is old , also / Or it has no hardware to control it , therefore LabVIEW and / or MAX Medium VISA How fast the test panel sends serial data to it is a question

Once a character is entered into the HyperTerminal , The HyperTerminal will write these characters to the serial port . therefore , When entering a string , The HyperTerminal will send... After the end of the string 6 Independent termination characters ： First of all s, And then there was t, And finally r wait .

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However ,LabVIEW Will get all strings and write them to the device at once , And there is no delay between characters . You can use one for Cycle to test , Output the string to the device one character at a time , Set a short delay for the output between each character in the loop . Attached Basic Serial Write and Read_1 bit.vi Is an implementation method

More details , Participate in the introduction of the following annex .

LabVIEW、LabVIEW Development 、LabVIEW Programming 、LabVIEW Program

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LabVIEW or MAX Under the VISA The serial port in the test panel cannot work - Beijing Hanwen Wangxing Technology Co., Ltd (bjcyck.com)