https://ni.lithium.com/t5/Instrument-Control-GPIB-Serial/VISA-Timeout-error/m-p/3582550#M74009 <P>Maybe that device uses another type of end of message sign. Could be cr or lf or both. I would try all combinations.</P> Sun, 12 Feb 2017 04:01:25 GMT Albert.Geven 2017-02-12T04:01:25Z https://ni.lithium.com/t5/Instrument-Control-GPIB-Serial/VISA-Timeout-error/m-p/3582515#M74008 <P>I am very new to using VISA library, hopefully someone can point me to the right direction.</P> <P>I have an application (Visual Studio 2013, vb.net) that &nbsp;is used to control fiber optic switches via serial, utilizing USB-Serial converter. Everything is working the way it is supposed to when I try to communicate with device using exsisting library.</P> <P>I am trying to evaluate NI VISA library(VISA.COM 5.7) to replace my current one.</P> <P>When I try to access my device using VISA by sending *IDN? , i get VISA timeout error.</P> <P>However, if i access my device using current library and then again using VISA i do get a proper response.</P> <P>This behavior is device specific. If I use the same program and try to communicate with other devices using VISA i do get a proper response.</P> <P>The device is LightTech Switch LT3000.</P> <P>Thanks in advance for any suggestions.</P> Sat, 11 Feb 2017 21:04:13 GMT https://ni.lithium.com/t5/Instrument-Control-GPIB-Serial/VISA-Timeout-error/m-p/3582515#M74008 yg-cci 2017-02-11T21:04:13Z https://ni.lithium.com/t5/Instrument-Control-GPIB-Serial/VISA-Timeout-error/m-p/3582550#M74009 <P>Maybe that device uses another type of end of message sign. Could be cr or lf or both. I would try all combinations.</P> Sun, 12 Feb 2017 04:01:25 GMT https://ni.lithium.com/t5/Instrument-Control-GPIB-Serial/VISA-Timeout-error/m-p/3582550#M74009 Albert.Geven 2017-02-12T04:01:25Z