Hi, I'm using "Serial communication.vi". It works weel to write to and read from the device. Since I want to read to a file, I modified "read" part in "serial communication.vi" and use "VISA Read To File" to read. When I run it, I got a file with something not readable (seems like machine code). In the help of "VISA Read to File", it said "the file specified in filename is opened in binary mode". I wonder if "in binary mode" is related to the problem? How can I read it to a text file or a file I can read? Thank for help.