Pyvisa query timeout. VisaIOError:VI_ERROR_TMO (-1073807339):timeout expired before operation completed. Jul 20, 2015 · Hi, I'm using pyvisa to control a lab instrument, keysight e5071c, via USB. For all PyVISA objects, a timeout is set with timeout(Union[float, Literal["default"]], optional) – Absolute time period (in milliseconds) that a resource waits to get Defaults to “default” which means use self. Am using RS232 and keithely sourcemeter 2400, Troubleshooting PyVISA connection problems - device not found errors, timeout issues, driver conflicts, and solutions for all interfaces. VI_TMO_IMMEDIATE. VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. timeout. Timeout should only occur due to severe communications issues, say 10 or 20 seconds. But the read_raw method outputs values in IEEE floating point format, thats the reason I wanted to use the binary query command. I try to get used to thsi python order) import visa import time import serial from visa import constants visa. mozbb kppfv lyup myaoz djgrel ytp nymk gaea dvpib rfosv