ValueError: [Errno 60] Operation timed out

[saarangp]

I get the following error when I run this code

VISA_ADDRESS = 'USB0::10893::5990::MY55440772::0::INSTR' rm = visa.ResourceManager() scope = rm.open_resource(VISA_ADDRESS) print("Connected to " + scope.query("*IDN?"))

USBError Traceback (most recent call last) /anaconda3/lib/python3.6/site-packages/pyvisa-py/protocols/usbtmc.py in write(self, data) 224 try: --> 225 return self.usb_send_ep.write(data) 226 except usb.core.USBError as e:

/anaconda3/lib/python3.6/site-packages/usb/core.py in write(self, data, timeout) 386 """ --> 387 return self.device.write(self, data, timeout) 388

/anaconda3/lib/python3.6/site-packages/usb/core.py in write(self, endpoint, data, timeout) 947 _interop.as_array(data), --> 948 self.__get_timeout(timeout) 949 )

/anaconda3/lib/python3.6/site-packages/usb/backend/libusb1.py in bulk_write(self, dev_handle, ep, intf, data, timeout) 823 data, --> 824 timeout) 825

/anaconda3/lib/python3.6/site-packages/usb/backend/libusb1.py in __write(self, fn, dev_handle, ep, intf, data, timeout) 919 if not (transferred.value and retval == LIBUSB_ERROR_TIMEOUT): --> 920 _check(retval) 921

/anaconda3/lib/python3.6/site-packages/usb/backend/libusb1.py in _check(ret) 594 else: --> 595 raise USBError(_strerror(ret), ret, _libusb_errno[ret]) 596

USBError: [Errno 60] Operation timed out

During handling of the above exception, another exception occurred:

ValueError Traceback (most recent call last)

in () 4 rm = visa.ResourceManager() 5 scope = rm.open_resource(VISA_ADDRESS) ----> 6 print("Connected to " + scope.query("*IDN?")) /anaconda3/lib/python3.6/site-packages/pyvisa/resources/messagebased.py in query(self, message, delay) 561 """ 562 --> 563 self.write(message) 564 565 delay = self.query_delay if delay is None else delay /anaconda3/lib/python3.6/site-packages/pyvisa/resources/messagebased.py in write(self, message, termination, encoding) 221 message += term 222 --> 223 count = self.write_raw(message.encode(enco)) 224 225 return count /anaconda3/lib/python3.6/site-packages/pyvisa/resources/messagebased.py in write_raw(self, message) 199 :rtype: int 200 """ --> 201 return self.visalib.write(self.session, message) 202 203 def write(self, message, termination=None, encoding=None): /anaconda3/lib/python3.6/site-packages/pyvisa-py/highlevel.py in write(self, session, data) 366 # from the session handle, dispatch to the write method of the session object. 367 try: --> 368 ret = self.sessions[session].write(data) 369 except KeyError: 370 return 0, StatusCode.error_invalid_object /anaconda3/lib/python3.6/site-packages/pyvisa-py/usb.py in write(self, data) 124 send_end, _ = self.get_attribute(constants.VI_ATTR_SEND_END_EN) 125 --> 126 count = self.interface.write(data) 127 128 return count, StatusCode.success /anaconda3/lib/python3.6/site-packages/pyvisa-py/protocols/usbtmc.py in write(self, data) 312 data[begin:end]) 313 --> 314 bytes_sent += raw_write(data) 315 316 return bytes_sent /anaconda3/lib/python3.6/site-packages/pyvisa-py/protocols/usbtmc.py in write(self, data) 225 return self.usb_send_ep.write(data) 226 except usb.core.USBError as e: --> 227 raise ValueError(str(e)) 228 229 def read(self, size): ValueError: [Errno 60] Operation timed out

[MatthieuDartiailh]

This looks awfully similar to https://github.com/pyvisa/pyvisa/issues/387. Sadly I do not really know what is happening here. Could you post the output of pyvisa-info and the model of the instrument you are trying to connect to ?

[anderson-pa]

I get the exact same error on Ubuntu 18.04, python 3.6 when trying to communicate with an Agilent 33521A with the 5.02 Keysight firmware. It was working before when it had the v1.14 firmware, though even then if I had a malformed command I'd have to reset the instrument to recover comms.

Here's my visa info output:

Machine Details: Platform ID: Linux-4.15.0-88-generic-x86_64-with-Ubuntu-18.04-bionic Processor: x86_64

Python: Implementation: CPython Executable: /usr/bin/python3 Version: 3.6.9 Compiler: GCC 8.3.0 Bits: 64bit Build: Nov 7 2019 10:44:02 (#default) Unicode: UCS4

PyVISA Version: 1.10.1

Backends: ni: Version: 1.10.1 (bundled with PyVISA)

1: /usr/lib/x86_64-linux-gnu/libvisa.so.0.0.0:

     found by: auto
     bitness: 64
     Could not get more info:
        VI_ERROR_NSUP_ATTR (-1073807331): The specified attribute is not defined or supported by the referenced object.

py: Version: 0.3.1 ASRL INSTR: Available via PySerial (3.4) USB INSTR: Available via PyUSB (1.0.2). Backend: libusb1 USB RAW: Available via PyUSB (1.0.2). Backend: libusb1 TCPIP INSTR: Available TCPIP SOCKET: Available GPIB INSTR: Please install linux-gpib to use this resource type. No module named 'Gpib'