Sep 2, 2025 · This error is commonly caused by improper physical connection, incorrect communication settings, or using commands that the device does not recognize. This document will walk you …

Jun 17, 2019 · Does anyone know how to fix the problem ? I usually do the following when trouble-shooting connection problems with (new) VISA instruments: Make sure it's properly connected. Like, …

I want to communicate an ANSER U2 proS printer by serial port (usb) with OPEN VISA and I have the error 1073807339, change the number of bytes to read up to 999 and the time out to 44 seconds.

Answer: When programming a SourceMeter through the VISA layer into RS-232, the use of SCPI commands is required. However, there are additional subtle requirements when the communication …

Oct 16, 2025 · First, ensure no delay has been inserted between writing the SCPI query command, and reading the response. For a query, the read should be performed immediately after the write.

Feb 26, 2019 · I'm using the pyvisa to remote control Agilent 53131A counter via GPIB cable but failed with TMO error. I used the Keysight I/O tool to send the same command and it always succeeded.

Sep 25, 2023 · pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. The instrument responds to the command. If I tell it to turn on the output, it will! …

As you see, this is a timeout error or you're trying to read more bytes than are actually coming in. Your VI is sitting and waiting for data to come in through the COM port, but it doesn't receive the 20 bytes …

Apr 16, 2025 · Error -1073807339 VISA Timeout Error When Trying to Communicate to ADAM I/O Modules Updated Apr 16, 2025

Oct 24, 2022 · I know it's related to the read byte count since if I set it to below the number of bytes it runs indefinitely, but if I set it to 13 (the amount specified in the sensor's manual) or more, I get the …