search

pyvisa / pyvisa-py

A pure python PyVISA backend
https://pyvisa-py.readthedocs.io
MIT License
288 stars 124 forks source link

Timeout Error on query #281

Closed aboddeti closed 4 years ago

aboddeti commented 4 years ago

I am remotely controlling a Keysight Power supply, model# E3649A using pyvisa on a Raspberry Pi. Until recently, it worked without any error.

Unfortunately, currently I am getting a timeout error.

Below is the information of my pyvisa ` Machine Details: Platform ID: Linux-4.19.66-v7+-armv7l-with-debian-10.1 Processor:

Python: Implementation: CPython Executable: /usr/bin/python Version: 2.7.16 Compiler: GCC 8.2.0 Bits: 32bit Build: Apr 6 2019 01:42:57 (#default) Unicode: UCS4

PyVISA Version: 1.10.1

Backends: ni: Version: 1.10.1 (bundled with PyVISA) Binary library: Not found py: Version: 0.3.1 ASRL INSTR: Available via PySerial (3.4) TCPIP INSTR: Available USB RAW: Available via PyUSB (1.1.0). Backend: libusb1 USB INSTR: Available via PyUSB (1.1.0). Backend: libusb1 GPIB INSTR: Please install linux-gpib to use this resource type. No module named gpib TCPIP SOCKET: Available

` and my python script is below:

`import time import visa

rm = visa.ResourceManager() res = rm.list_resources() print(res)

inst = rm.open_resource("ASRL/dev/ttyUSB0::INSTR") time.sleep(1) print("Connected to" + inst.query('*IDN?')) `

MatthieuDartiailh commented 4 years ago

That seems odd in particular since you are not running very recent versions of either pyvisa or pyvisa-py. I would suggest going through the usual debugging steps detailed here https://pyvisa.readthedocs.io/en/latest/introduction/communication.html#getting-the-instrument-configuration-right, taking into account that serial instruments have some extra parameters (baud_rate, etc). I would also suggest you to update to the most recent version of pyvisa and pyvisa-py.

aboddeti commented 4 years ago

Issue solved, updated to latest version of pyvisa.