i am unable to read from serial port using rs232.

[richa]

i want to collect data from an equipment which communicates through rs232. i am using visa. my code has file open, read n close with serial port and read from serial port. my data files are blank. i m sure that either i havent configured properly or there is a problem with my cde as the software along with equipment displays the graph whose data i require.

[Chris_Rake]

Have you duplicated the procedure with a program like hyperterm or VISAIC? Also, some instruments require a command to be received prior to sending data. Do you need to add a VISA write before the read?

[RobertoBozzolo]

One of the most common problems in serial communication is the need for an adequate timing: how much time is expected your device to spend before answering? Have you put and adequate pause in your code before reading from the serial port?

Hope this helps
Roberto