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Fails to find connected devices #858

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drmcnelson opened this issue Sep 30, 2024 · 14 comments
Open

Fails to find connected devices #858

drmcnelson opened this issue Sep 30, 2024 · 14 comments

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@drmcnelson
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Attempting to communicate with Siglent SPD1000x

list_resources() returns nothing.

open fails.

Following are

(a) the output from lsusb -v

(b) a sample program, downloaded from here or siglent (i forget which) with some added diagnostics

(c) the stack trace from the program

lsusb output

Bus 001 Device 009: ID f4ec:1410 Atten Electronics / Siglent Technologies SPD1000X
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0xf4ec Atten Electronics / Siglent Technologies
idProduct 0x1410 SPD1000X
bcdDevice 1.00
iManufacturer 1 Siglent
iProduct 2 SPD1000X
iSerial 3 SPD13DCC8R0195
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0020
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 254 Application Specific Interface
bInterfaceSubClass 3 Test and Measurement
bInterfaceProtocol 1 TMC
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)

sample program

#JAC: 03/31/2020
#-Added \n to write and read terminations

import pyvisa
import time # for sleep
import binascii

def main():
rm = pyvisa.ResourceManager()
print( 'list resources' )
rm.list_resources()
print( 'instadd')
instadd = 'USB0::0xF4EC::0x1410::SPD13DCC8R0195::INSTR'
print( 'open')
inst = rm.open_resource(instadd)
inst.write_termination='\n'
inst.read_termination='\n'
print (rm.list_resources())
time.sleep(0.04)
inst.write('OUTP CH1,ON')
time.sleep(2)
inst.write('OUTP CH1,OFF')
time.sleep(2)
inst.write('*IDN?')
#print ("here")
time.sleep(1)
qStr = inst.read()
print (str(qStr))
inst.close()

if name == 'main':
main()

output and stack trace
list resources
instadd
open
Traceback (most recent call last):
File "/home/datacollection/TeensyDataAcquistion/Python_Programs_240927/./SPD1000x.py", line 35, in
main()
File "/home/datacollection/TeensyDataAcquistion/Python_Programs_240927/./SPD1000x.py", line 18, in main
inst = rm.open_resource(instadd)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3292, in open_resource
res.open(access_mode, open_timeout)
File "/usr/local/lib/python3.12/site-packages/pyvisa/resources/resource.py", line 281, in open
self.session, status = self._resource_manager.open_bare_resource(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3217, in open_bare_resource
return self.visalib.open(self.session, resource_name, access_mode, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/highlevel.py", line 168, in open
sess = cls(session, resource_name, parsed, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/sessions.py", line 322, in init
self.after_parsing()
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/usb.py", line 82, in after_parsing
self.interface = self._intf_cls(
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 307, in init
super(USBTMC, self).init(vendor, product, serial_number, **kwargs)
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 202, in init
raise ValueError("No device found.")
ValueError: No device found.
@drmcnelson
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P/S Here is the output from pyvisa-info

Machine Details:
Platform ID: Linux-6.8.8-300.fc40.x86_64-x86_64-with-glibc2.39
Processor:

Python:
Implementation: CPython
Executable: /usr/bin/python3
Version: 3.12.3
Compiler: GCC 14.0.1 20240411 (Red Hat 14.0.1-0)
Architecture: ('x86', 64)
Build: Apr 17 2024 00:00:00 (#main)
Unicode: UCS4

PyVISA Version: 1.14.1

Backends:
ivi:
Version: 1.14.1 (bundled with PyVISA)
Binary library: Not found
py:
Version: 0.7.2
ASRL INSTR: Available via PySerial (3.5)
USB INSTR: Available via PyUSB (1.2.1). Backend: libusb1
USB RAW: Available via PyUSB (1.2.1). Backend: libusb1
TCPIP INSTR: Available
Resource discovery:
- VXI-11: ok
- hislip: ok
TCPIP SOCKET: Available
VICP INSTR:
Please install PyVICP to use this resource type.
GPIB INSTR:
Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities.
No module named 'gpib'
GPIB INTFC:
Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities.
No module named 'gpib'

@DavidLutton
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rm.list_resources() doesn't print to the output by itself
Please try as print(rm.list_resources())

We can go on from there

@drmcnelson
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drmcnelson commented Sep 30, 2024 •
edited
Loading

Thank you, here is the output

Resource Manager of Visa Library at py
list resources
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR')
instadd
open
Traceback (most recent call last):
File "/home/datacollection/TeensyDataAcquistion/Python_Programs/SPD1000x.py", line 36, in
main()
File "/home/datacollection/TeensyDataAcquistion/Python_Programs/SPD1000x.py", line 19, in main
inst = rm.open_resource(instadd)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3292, in open_resource
res.open(access_mode, open_timeout)
File "/usr/local/lib/python3.12/site-packages/pyvisa/resources/resource.py", line 281, in open
self.session, status = self._resource_manager.open_bare_resource(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3217, in open_bare_resource
return self.visalib.open(self.session, resource_name, access_mode, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/highlevel.py", line 168, in open
sess = cls(session, resource_name, parsed, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/sessions.py", line 322, in init
self.after_parsing()
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/usb.py", line 82, in after_parsing
self.interface = self._intf_cls(
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 307, in init
super(USBTMC, self).init(vendor, product, serial_number, **kwargs)
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 202, in init
raise ValueError("No device found.")
ValueError: No device found.

@drmcnelson
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Author

Permissions is part of it, here it is again with sudo

sudo ./SPD1000x.py
Resource Manager of Visa Library at py
list resources
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR', 'USB0::62700::5136::SPD13DCC8R0195\x00\x00\x00\x00::0::INSTR')
instadd
open
Traceback (most recent call last):
File "/home/datacollection/TeensyDataAcquistion/Python_Programs_240927/./SPD1000x.py", line 36, in
main()
File "/home/datacollection/TeensyDataAcquistion/Python_Programs_240927/./SPD1000x.py", line 19, in main
inst = rm.open_resource(instadd)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3292, in open_resource
res.open(access_mode, open_timeout)
File "/usr/local/lib/python3.12/site-packages/pyvisa/resources/resource.py", line 281, in open
self.session, status = self._resource_manager.open_bare_resource(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3217, in open_bare_resource
return self.visalib.open(self.session, resource_name, access_mode, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/highlevel.py", line 168, in open
sess = cls(session, resource_name, parsed, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/sessions.py", line 322, in init
self.after_parsing()
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/usb.py", line 82, in after_parsing
self.interface = self._intf_cls(
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 307, in init
super(USBTMC, self).init(vendor, product, serial_number, **kwargs)
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 202, in init
raise ValueError("No device found.")
ValueError: No device found.

@arr-ee
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Contributor

arr-ee commented Sep 30, 2024

Have a look at this comment: #758 (comment)

I’ll try to pick up pyvisa/pyvisa-py#423 soon unless somebody else does it, there’s minimal changes + docs to be done.

@arr-ee
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Contributor

arr-ee commented Sep 30, 2024

Although I just noticed the null bytes in the address generated from root — that’s a bit odd.

@drmcnelson
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Author

The first comment, got use past the permissions for the listing, here is where we are now, without sudo.

Resource Manager of Visa Library at py
list resources
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR', 'USB0::62700::5136::SPD13DCC8R0195\x00\x00\x00\x00::0::INSTR')
instadd
open
Traceback (most recent call last):
File "/home/datacollection/TeensyDataAcquistion/Python_Programs_240927/./SPD1000x.py", line 36, in
main()
File "/home/datacollection/TeensyDataAcquistion/Python_Programs_240927/./SPD1000x.py", line 19, in main
inst = rm.open_resource(instadd)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3292, in open_resource
res.open(access_mode, open_timeout)
File "/usr/local/lib/python3.12/site-packages/pyvisa/resources/resource.py", line 281, in open
self.session, status = self._resource_manager.open_bare_resource(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa/highlevel.py", line 3217, in open_bare_resource
return self.visalib.open(self.session, resource_name, access_mode, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/highlevel.py", line 168, in open
sess = cls(session, resource_name, parsed, open_timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/sessions.py", line 322, in init
self.after_parsing()
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/usb.py", line 82, in after_parsing
self.interface = self._intf_cls(
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 307, in init
super(USBTMC, self).init(vendor, product, serial_number, **kwargs)
File "/usr/local/lib/python3.12/site-packages/pyvisa_py/protocols/usbtmc.py", line 202, in init
raise ValueError("No device found.")
ValueError: No device found.

@drmcnelson
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Author

Here is some progress:
The new sample program, add the trailing 0's,. and add the extra field with 0.

#!/usr/bin/python

#JAC: 03/31/2020
#-Added \n to write and read terminations

import pyvisa
import time # for sleep
import binascii

def main():
rm = pyvisa.ResourceManager()
print(rm)
print( 'list resources' )
print( rm.list_resources() )
print( 'instadd')
instadd = 'USB0::0xF4EC::0x1410::SPD13DCC8R0195\0\0\0\0::0::INSTR'
print( 'open', instadd)
inst = rm.open_resource(instadd)
inst.write_termination='\n'
inst.read_termination='\n'
print (rm.list_resources())
time.sleep(0.04)
inst.write('OUTP CH1,ON')
time.sleep(2)
inst.write('OUTP CH1,OFF')
time.sleep(2)
inst.write('*IDN?')
#print ("here")
time.sleep(1)
qStr = inst.read()
print (str(qStr))
inst.close()

if name == 'main':
main()

And here is the output

./SPD1000x.py
Resource Manager of Visa Library at py
list resources
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR', 'USB0::62700::5136::SPD13DCC8R0195\x00\x00\x00\x00::0::INSTR')
instadd
open USB0::0xF4EC::0x1410::SPD13DCC8R0195::0::INSTR
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR', 'USB0::62700::5136::SPD13DCC8R0195\x00\x00\x00\x00::0::INSTR')

@drmcnelson
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Author

Notice it is hung after the second list_resources.

So, take out the read termination, and voila, we get an answer. It is incredibly slow, but it answers.

#!/usr/bin/python

#JAC: 03/31/2020
#-Added \n to write and read terminations

import pyvisa
import time # for sleep
import binascii

def main():
rm = pyvisa.ResourceManager()
print(rm)
print( 'list resources' )
print( rm.list_resources() )
print( 'instadd')
instadd = 'USB0::0xF4EC::0x1410::SPD13DCC8R0195\0\0\0\0::0::INSTR'
print( 'open', instadd)
inst = rm.open_resource(instadd)
inst.write_termination='\n'
#inst.read_termination='\n'
print (rm.list_resources())
time.sleep(0.04)
inst.write('OUTP CH1,ON')
time.sleep(2)
inst.write('OUTP CH1,OFF')
time.sleep(2)
inst.write('*IDN?')
#print ("here")
time.sleep(1)
qStr = inst.read()
print (str(qStr))
inst.close()

if name == 'main':
main()

Resource Manager of Visa Library at py
list resources
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR', 'USB0::62700::5136::SPD13DCC8R0195\x00\x00\x00\x00::0::INSTR')
instadd
open USB0::0xF4EC::0x1410::SPD13DCC8R0195::0::INSTR
('ASRL/dev/ttyS0::INSTR', 'ASRL/dev/ttyS1::INSTR', 'ASRL/dev/ttyS2::INSTR', 'ASRL/dev/ttyS3::INSTR', 'ASRL/dev/ttyS4::INSTR', 'ASRL/dev/ttyS5::INSTR', 'ASRL/dev/ttyS6::INSTR', 'ASRL/dev/ttyS7::INSTR', 'ASRL/dev/ttyS8::INSTR', 'ASRL/dev/ttyS9::INSTR', 'ASRL/dev/ttyS10::INSTR', 'ASRL/dev/ttyS11::INSTR', 'ASRL/dev/ttyS12::INSTR', 'ASRL/dev/ttyS13::INSTR', 'ASRL/dev/ttyS14::INSTR', 'ASRL/dev/ttyS15::INSTR', 'ASRL/dev/ttyS16::INSTR', 'ASRL/dev/ttyS17::INSTR', 'ASRL/dev/ttyS18::INSTR', 'ASRL/dev/ttyS19::INSTR', 'ASRL/dev/ttyS20::INSTR', 'ASRL/dev/ttyS21::INSTR', 'ASRL/dev/ttyS22::INSTR', 'ASRL/dev/ttyS23::INSTR', 'ASRL/dev/ttyS24::INSTR', 'ASRL/dev/ttyS25::INSTR', 'ASRL/dev/ttyS26::INSTR', 'ASRL/dev/ttyS27::INSTR', 'ASRL/dev/ttyS28::INSTR', 'ASRL/dev/ttyS29::INSTR', 'ASRL/dev/ttyS30::INSTR', 'ASRL/dev/ttyS31::INSTR', 'USB0::62700::5136::SPD13DCC8R0195\x00\x00\x00\x00::0::INSTR')
Siglent

@arr-ee
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arr-ee commented Sep 30, 2024

Can you please check if your instrument’s firmware is up to date? See https://int.siglent.com/download/firmwares/?ProId=28
Null bytes appear to be coming from the instrument itself.

That output also does not look too hot, it is not complete, which might lead to issues reading subsequent responses.

@drmcnelson
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Okay, that gets me going. Thank you.

Maybe some more detail on installation would help.

@drmcnelson
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drmcnelson commented Sep 30, 2024 •
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Here is the recipe

 sudo pip install pyusb
 sudo pip install zeroconf
 sudo pip install pyvisa-py
 sudo pip install pyvisa

 sudo cp usbtmcdevices.rules /etc/udev/rules.d/

 sudo udevadm control --reload-rules && sudo udevadm trigger

And here is a rules with a few devices

 KERNEL=="usbtmc/*", MODE="0660", GROUP="dialout"
 KERNEL=="usbtmc[0-9]*", MODE="0660", GROUP="dialout"

 SUBSYSTEM=="usb", ATTR{idVendor}=="1313", ATTR{idProduct}=="8078", GROUP="dialout",      MODE="0660"

 SUBSYSTEM=="usb", ATTR{idVendor}=="0957", ATTR{idProduct}=="b318", GROUP="dialout", MODE="0660"

 SUBSYSTEM=="usb", ATTR{idVendor}=="f4ec", ATTR{idProduct}=="1410", GROUP="dialout", MODE="0660"

@MatthieuDartiailh
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@drmcnelson @arr-ee feel free to suggest improvement to pyvisa-py documentation regarding proper configuration of USBTMC devices. There is room for improvement but I have too little first hand experience there to make any substantial change.

@arr-ee
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arr-ee commented Oct 1, 2024

@MatthieuDartiailh yeah I’ll pick up the PR mentioned above and will update docs since it is a requirement for the PR to make sense.

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@arr-ee @DavidLutton @MatthieuDartiailh @drmcnelson