search

pyvisa / pyvisa-py

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

Having Difficulty Reading from TCIP socket #149

Closed ghost closed 5 years ago

ghost commented 6 years ago

Hello, First of all I apologize, I'm a new user to this library so I may be making a silly blunder, if so please kindly point it out to me. I'm trying to use the pyvisa-py library to communicate with my Siglent instruments over Ethernet. The instrument in this case is the Siglent SDG2042 function generator. It seems I'm able to open a socket with an instrument, but I dont think I'm getting the correct response. Some basic info (using ubuntu pc): $ python -m visa info Machine Details: Platform ID: Linux-4.4.71-ELAR-Systems-armv7l-with-Ubuntu-18.04-bionic Processor: armv7l

Python: Implementation: CPython Executable: /usr/bin/python Version: 2.7.15rc1 Compiler: GCC 7.3.0 Bits: 32bit Build: Apr 15 2018 21:51:34 (#default) Unicode: UCS4

PyVISA Version: 1.9.0

Backends: ni: Version: 1.9.0 (bundled with PyVISA) Binary library: Not found py: Version: 0.2 ASRL INSTR: Available via PySerial (3.4) TCPIP INSTR: Available USB RAW: Available via PyUSB (1.0.2). Backend: libusb1 USB INSTR: Available via PyUSB (1.0.2). Backend: libusb1 GPIB INSTR: Please install linux-gpib to use this resource type. No module named gpib TCPIP SOCKET: Available

$python Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import visa import sys print (sys.path) ['', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-arm-linux-gnueabihf', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/home/tinker/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/gtk-2.0'] visa.log_to_screen() rm = visa.ResourceManager('@py') 2018-06-28 22:58:34,454 - pyvisa - DEBUG - Reusing ResourceManager with session 3730723 device = rm.open_resource("TCPIP::192.168.250.110::23::SOCKET") 2018-06-28 22:58:54,199 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - opening ... 2018-06-28 22:58:54,205 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - is open with session 1282565

When I issue this command, immediately the line Status Code.success is returned, then waits about 1 min before printing the traceback:

print(device.query("*IDN?")) 2018-06-28 22:59:24,031 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 564, in query return self.read() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 413, in read message = self._read_raw().decode(enco) UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)

When issuing the below command adding the newline character, the success line is returned immediately:

print(device.query("*IDN?\n")) 2018-06-28 23:01:51,649 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>)

Reading the Siglent manual, the response to the IDN? command is supposed to be in the form: IDN ,,,,, As an example in the Siglent manual is this: *IDN SDG SDG1022,00-00-00-13-22,1.01.01.10R1,20.234.3.

Is there a mistake I'm making somewhere? Am I not reading the response correctly? Also, I'm new to python, but a veteran C writer, so I could be making a python error as well.

Thanks for any help you can provide. Cheers

ghost commented 6 years ago

Also, sometimes the device thinks I'm trying to telnet into it:

print(device.query("*IDN?\n")) 2018-06-28 23:21:49,317 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>)

Login incorrect (none) login: Login timed out after 60 seconds

Did a port scan of the device using nmap: $ nmap 192.168.250.110

Starting Nmap 7.60 ( https://nmap.org ) at 2018-06-28 23:27 PDT Nmap scan report for 192.168.250.110 Host is up (0.00038s latency). Not shown: 998 closed ports PORT STATE SERVICE 23/tcp open telnet 111/tcp open rpcbind

Nmap done: 1 IP address (1 host up) scanned in 0.20 seconds

Then tried opening on a different socket, but receive the same results:

device = rm.open_resource("TCPIP::192.168.250.110::111::SOCKET") 2018-06-28 23:23:41,412 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - opening ... 2018-06-28 23:23:41,413 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - is open with session 6963028 print(device.query("*IDN?\n")) 2018-06-28 23:23:45,029 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>)

If attempting to open the device as an instrument, this is the output:

device = rm.open_resource("TCPIP::192.168.250.110::23::INSTR") 2018-06-28 23:25:46,207 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::INSTR - opening ... 2018-06-28 23:25:46,207 - pyvisa - DEBUG - RawTCPClient: connecting to socket at (192.168.250.110, 111) 2018-06-28 23:25:46,208 - pyvisa - DEBUG - Make call <PortMapperVersion.get_port: 3>, (395183, 1, 6, 0), <bound method PortMapperPacker.pack_mapping of <pyvisa-py.protocols.rpc.PortMapperPacker instance at 0xb512c0d0>>, <bound method PortMapperUnpacker.unpack_uint of <pyvisa-py.protocols.rpc.PortMapperUnpacker instance at 0xb512c198>> Traceback (most recent call last): File "/usr/lib/python2.7/logging/init.py", line 868, in emit msg = self.format(record) File "/usr/lib/python2.7/logging/init.py", line 741, in format return fmt.format(record) File "/usr/lib/python2.7/logging/init.py", line 465, in format record.message = record.getMessage() File "/usr/lib/python2.7/logging/init.py", line 329, in getMessage msg = msg % self.args UnicodeDecodeError: 'ascii' codec can't decode byte 0x86 in position 14: ordinal not in range(128) Logged from file rpc.py, line 296 2018-06-28 23:25:46,210 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb50c6458>: '\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\xb5' 2018-06-28 23:25:46,211 - pyvisa - DEBUG - RawTCPClient: closing socket 2018-06-28 23:25:46,211 - pyvisa - DEBUG - RawTCPClient: connecting to socket at (192.168.250.110, 693) 2018-06-28 23:25:46,212 - pyvisa - DEBUG - Make call 10, (2000378720L, 0, 10000, u'23'), <bound method Vxi11Packer.pack_create_link_parms of <pyvisa-py.protocols.vxi11.Vxi11Packer instance at 0xb50c1fa8>>, <bound method Vxi11Unpacker.unpack_create_link_resp of <pyvisa-py.protocols.vxi11.Vxi11Unpacker instance at 0xb50c1f58>> Traceback (most recent call last): File "/usr/lib/python2.7/logging/init.py", line 868, in emit msg = self.format(record) File "/usr/lib/python2.7/logging/init.py", line 741, in format return fmt.format(record) File "/usr/lib/python2.7/logging/init.py", line 465, in format record.message = record.getMessage() File "/usr/lib/python2.7/logging/init.py", line 329, in getMessage msg = msg % self.args UnicodeDecodeError: 'ascii' codec can't decode byte 0xaf in position 15: ordinal not in range(128) Logged from file rpc.py, line 296 2018-06-28 23:25:46,214 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb50c6420>: '\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00' 2018-06-28 23:25:46,215 - pyvisa - DEBUG - TCPIP0::192.168.250.110::23::INSTR - closing Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/highlevel.py", line 1655, in open_resource res.open(access_mode, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/resource.py", line 209, in open self.session, status = self._resource_manager.open_bare_resource(self._resource_name, access_mode, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/highlevel.py", line 1612, in open_bare_resource return self.visalib.open(self.session, resource_name, access_mode, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 191, in open sess = cls(session, resource_name, parsed) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/sessions.py", line 184, in init self.after_parsing() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/tcpip.py", line 62, in after_parsing raise Exception("error creating link: %d" % error) Exception: error creating link: 3

MatthieuDartiailh commented 6 years ago

Could you try to update to the current master branch ? A number of issues have been fixed since 0.2 was released (hopefully I will be able to relrase 0.3 soon).

ghost commented 6 years ago

Thank you for your assistance Matthieu, I upgraded using this command: $ pip install -U https://github.com/hgrecco/pyvisa-py/zipball/master

Then, running python, I received an error when trying to import visa: $ python Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import socket import visa Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/visa.py", line 16, in from pyvisa import logger, version, log_to_screen, constants File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/init.py", line 18, in import pkg_resources File "/usr/lib/python2.7/dist-packages/pkg_resources/init.py", line 36, in import email.parser File "/usr/lib/python2.7/email/parser.py", line 12, in from email.feedparser import FeedParser File "/usr/lib/python2.7/email/feedparser.py", line 27, in from email import message File "/usr/lib/python2.7/email/message.py", line 16, in import email.charset File "/usr/lib/python2.7/email/charset.py", line 13, in import email.base64mime File "/usr/lib/python2.7/email/base64mime.py", line 40, in from email.utils import fix_eols File "/usr/lib/python2.7/email/utils.py", line 29, in import urllib File "/usr/lib/python2.7/urllib.py", line 862, in class ftpwrapper: File "/usr/lib/python2.7/urllib.py", line 866, in ftpwrapper timeout=socket._GLOBAL_DEFAULT_TIMEOUT, AttributeError: 'module' object has no attribute '_GLOBAL_DEFAULT_TIMEOUT'

What should I do next?

ghost commented 6 years ago

This error also occurs if I dont import socket first: $ python Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import visa Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/visa.py", line 16, in from pyvisa import logger, version, log_to_screen, constants File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/init.py", line 18, in import pkg_resources File "/usr/lib/python2.7/dist-packages/pkg_resources/init.py", line 36, in import email.parser File "/usr/lib/python2.7/email/parser.py", line 12, in from email.feedparser import FeedParser File "/usr/lib/python2.7/email/feedparser.py", line 27, in from email import message File "/usr/lib/python2.7/email/message.py", line 16, in import email.charset File "/usr/lib/python2.7/email/charset.py", line 13, in import email.base64mime File "/usr/lib/python2.7/email/base64mime.py", line 40, in from email.utils import fix_eols File "/usr/lib/python2.7/email/utils.py", line 29, in import urllib File "/usr/lib/python2.7/urllib.py", line 862, in class ftpwrapper: File "/usr/lib/python2.7/urllib.py", line 866, in ftpwrapper timeout=socket._GLOBAL_DEFAULT_TIMEOUT, AttributeError: 'module' object has no attribute '_GLOBAL_DEFAULT_TIMEOUT'

ghost commented 6 years ago

Ok I was able to import visa after rebooting: $ python -m visa info Machine Details: Platform ID: Linux-4.4.71-ELAR-Systems-armv7l-with-Ubuntu-18.04-bionic Processor: armv7l

Python: Implementation: CPython Executable: /usr/bin/python Version: 2.7.15rc1 Compiler: GCC 7.3.0 Bits: 32bit Build: Apr 15 2018 21:51:34 (#default) Unicode: UCS4

PyVISA Version: 1.9.0

Backends: ni: Version: 1.9.0 (bundled with PyVISA) Binary library: Not found py: Version: 0.3.dev0 ASRL INSTR: Available via PySerial (3.4) TCPIP INSTR: Available USB RAW: Available via PyUSB (1.0.2). Backend: libusb1 USB INSTR: Available via PyUSB (1.0.2). Backend: libusb1 GPIB INSTR: Please install linux-gpib to use this resource type. No module named gpib TCPIP SOCKET: Available

Now when I attempt to run the commands, this is the output received:

import visa import sys import binascii visa.log_to_screen() rm = visa.ResourceManager('@py') 2018-06-29 23:00:11,299 - pyvisa - DEBUG - Reusing ResourceManager with session 1173664 2018-06-29 23:00:11,299 - pyvisa - DEBUG - Reusing ResourceManager with session 1173664 dmm = rm.open_resource('TCPIP::192.168.250.110::23::SOCKET') 2018-06-29 23:02:44,797 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - opening ... 2018-06-29 23:02:44,797 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - opening ... 2018-06-29 23:02:44,799 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - is open with session 6535500 2018-06-29 23:02:44,799 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - is open with session 6535500 print(dmm.query("*IDN?\n")) 2018-06-29 23:02:48,948 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) 2018-06-29 23:02:48,948 - pyvisa - DEBUG - TCPIP::192.168.250.110::23::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) 2018-06-29 23:03:44,843 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - closing 2018-06-29 23:03:44,843 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - closing 2018-06-29 23:03:44,844 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - is closed 2018-06-29 23:03:44,844 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - is closed Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python2.7/dist-packages/pyvisa/resources/messagebased.py", line 564, in query return self.read() File "/usr/local/lib/python2.7/dist-packages/pyvisa/resources/messagebased.py", line 413, in read message = self._read_raw().decode(enco) UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)

ghost commented 6 years ago

UPDATE: I was able to verify the underlying network connection works by connecting to the socket directly, using the following commands I found in Siglent tutorial:

$ python Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) ip = "192.168.250.110" port = 5024 s.connect((ip, port)) s.sendall(b'*IDN?') s.sendall(b'\n') print s.recv(4096) Welcome to the SCPI instrument 'Siglent SDG2042X' Siglent Technologies,SDG2042X,SDG2XCAQ1R1528,2.01.01.23R5

ghost commented 6 years ago

Here's another error I often receive after the tring of commands: tinker@ELAR-Systems:~/Documents/SCP/scripts$ python2.7 Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import visa import time import binascii import sys visa.log_to_screen() rm = visa.ResourceManager('@py') 2018-06-30 00:49:40,781 - pyvisa - DEBUG - SerialSession was correctly imported. 2018-06-30 00:49:40,827 - pyvisa - DEBUG - USBSession and USBRawSession were correctly imported. 2018-06-30 00:49:40,842 - pyvisa - DEBUG - TCPIPSession was correctly imported. 2018-06-30 00:49:40,844 - pyvisa - DEBUG - GPIBSession was not imported No module named gpib. 2018-06-30 00:49:40,844 - pyvisa - DEBUG - Created library wrapper for unset 2018-06-30 00:49:40,845 - pyvisa - DEBUG - Created ResourceManager with session 5994359 device = rm.open_resource("TCPIP::192.168.250.110::111::SOCKET") 2018-06-30 00:49:56,759 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - opening ... 2018-06-30 00:49:56,766 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - is open with session 4810401 device.term_chars = "\n" print(device.query("*IDN?")) 2018-06-30 00:50:32,690 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) 2018-06-30 00:50:34,703 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'') Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 564, in query return self.read() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 413, in read message = self._read_raw().decode(enco) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 386, in _read_raw chunk, status = self.visalib.read(self.session, size) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 323, in read raise errors.VisaIOError(ret[1]) pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.

MatthieuDartiailh commented 6 years ago

Where did you find the connection info you are using ? Port 23 is reserved for telnet so it cannot work for a raw VISA socket. 111 if for RPC which in the context of VISA most likely means that you should attempt to connect using the INSTR protocol of VISA not the socket one. I believe you should always use 5024 for RAW socket VISA communication.. Another thing that appears off is that term_chars does not exist anymore (deprecated in 1.5). You can now send independently the read and write termination using the read_termination and write_termination attributes.

ghost commented 6 years ago

Hi Mathieu, Thank you for your very good information. I stopped using the term_chars and instead inserted \n into the command string. I tried as you suggested, and changed to port 5024. I still seem to be receiving some type of timeout error: python Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import visa import time import sys import binascii visa.log_to_screen() rm = visa.ResourceManager('@py') 2018-07-01 09:51:59,718 - pyvisa - DEBUG - SerialSession was correctly imported. 2018-07-01 09:51:59,766 - pyvisa - DEBUG - USBSession and USBRawSession were correctly imported. 2018-07-01 09:51:59,788 - pyvisa - DEBUG - TCPIPSession was correctly imported. 2018-07-01 09:51:59,789 - pyvisa - DEBUG - GPIBSession was not imported No module named gpib. 2018-07-01 09:51:59,790 - pyvisa - DEBUG - Created library wrapper for unset 2018-07-01 09:51:59,790 - pyvisa - DEBUG - Created ResourceManager with session 2155461 device = rm.open_resource("TCPIP::192.168.250.110::5024::SOCKET") 2018-07-01 09:52:43,001 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - opening ... 2018-07-01 09:52:43,003 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - is open with session 5837562 print(device.query("IDN?")) 2018-07-01 09:53:04,587 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) 2018-07-01 09:53:06,604 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'') 2018-07-01 09:53:06,604 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::INSTR - closing Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 564, in query return self.read() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 413, in read message = self._read_raw().decode(enco) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 386, in _read_raw chunk, status = self.visalib.read(self.session, size) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 323, in read raise errors.VisaIOError(ret[1]) pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. print(device.query("IDN?\n")) 2018-07-01 09:53:38,664 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) 2018-07-01 09:53:40,679 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'') Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 564, in query return self.read() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 413, in read message = self._read_raw().decode(enco) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 386, in _read_raw chunk, status = self.visalib.read(self.session, size) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 323, in read raise errors.VisaIOError(ret[1]) pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.

ghost commented 6 years ago

It is odd though, after sending the command I'll immediately receive a response, followed by a couple second wait, then the timeout error:

print(device.query("*IDN?\n")) 2018-07-01 10:01:08,504 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) [Waits a couple seconds] [Then delivers the timeout error]

ghost commented 6 years ago

I was using port 23 and 111 due to my own lack of knowledge. I saw them as the only open ports using nmap. Fo some reason nmap did not detect port 5024 as being open

ghost commented 6 years ago

If attempting to use port 111 as INSTR, this is the response I receive:

device = rm.open_resource("TCPIP::192.168.250.110::111::INSTR") 2018-07-01 10:04:49,615 - pyvisa - DEBUG - TCPIP::192.168.250.110::111::INSTR - opening ... 2018-07-01 10:04:49,615 - pyvisa - DEBUG - RawTCPClient: connecting to socket at (192.168.250.110, 111) 2018-07-01 10:04:49,617 - pyvisa - DEBUG - Make call <PortMapperVersion.get_port: 3>, (395183, 1, 6, 0), <bound method PortMapperPacker.pack_mapping of <pyvisa-py.protocols.rpc.PortMapperPacker instance at 0xb526b0a8>>, <bound method PortMapperUnpacker.unpack_uint of <pyvisa-py.protocols.rpc.PortMapperUnpacker instance at 0xb526b0f8>> 2018-07-01 10:04:49,617 - pyvisa - DEBUG - Sending record through <socket._socketobject object at 0xb525c8b8>: '\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x01\x86\xa0\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x07\xaf\x00\x00\x00\x01\x00\x00\x00\x06\x00\x00\x00\x00' 2018-07-01 10:04:49,619 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb525c8b8>: bytearray(b'\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\xb5') 2018-07-01 10:04:49,619 - pyvisa - DEBUG - RawTCPClient: closing socket 2018-07-01 10:04:49,619 - pyvisa - DEBUG - RawTCPClient: connecting to socket at (192.168.250.110, 693) 2018-07-01 10:04:49,620 - pyvisa - DEBUG - Make call 10, (1166704935L, 0, 10000, u'111'), <bound method Vxi11Packer.pack_create_link_parms of <pyvisa-py.protocols.vxi11.Vxi11Packer instance at 0xb5260c60>>, <bound method Vxi11Unpacker.unpack_create_link_resp of <pyvisa-py.protocols.vxi11.Vxi11Unpacker instance at 0xb5260c10>> 2018-07-01 10:04:49,621 - pyvisa - DEBUG - Sending record through <socket._socketobject object at 0xb525c8f0>: "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x07\xaf\x00\x00\x00\x01\x00\x00\x00\n\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00E\x8a\x81'\x00\x00\x00\x00\x00\x00'\x10\x00\x00\x00\x03111\x00" 2018-07-01 10:04:49,622 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb525c8f0>: bytearray(b'\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00') Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/highlevel.py", line 1655, in open_resource res.open(access_mode, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/resource.py", line 209, in open self.session, status = self._resource_manager.open_bare_resource(self._resource_name, access_mode, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/highlevel.py", line 1612, in open_bare_resource return self.visalib.open(self.session, resource_name, access_mode, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 193, in open sess = cls(session, resource_name, parsed, open_timeout) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/sessions.py", line 209, in init self.after_parsing() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/tcpip.py", line 56, in after_parsing raise Exception("error creating link: %d" % error) Exception: error creating link: 3

MatthieuDartiailh commented 6 years ago

PyVISA tries to read till it encounter the termination character, so you should set it using read_termination (note also that using write_termination is less error prone that manually adding it). If you do not know the termination character used by your instrument you can try to use the read_bytes method to read a fix number of bytes and identify the term char. When using INSTR, you SHOULD not pass the port simply used TCPIP::192.168.250.110::INSTR.

ghost commented 6 years ago

Thank you very much Matthieu, I see improvement! Now I can get part of the response, but no the whole thing. This is what I see:

import visa import time import binascii import sys visa.log_to_screen() rm=visa.ResourceManafer('@py') Traceback (most recent call last): File "", line 1, in AttributeError: 'module' object has no attribute 'ResourceManafer' rm=visa.ResourceManager('@py') 2018-07-01 13:55:13,162 - pyvisa - DEBUG - SerialSession was correctly imported. 2018-07-01 13:55:13,211 - pyvisa - DEBUG - USBSession and USBRawSession were correctly imported. 2018-07-01 13:55:13,228 - pyvisa - DEBUG - TCPIPSession was correctly imported. 2018-07-01 13:55:13,229 - pyvisa - DEBUG - GPIBSession was not imported No module named gpib. 2018-07-01 13:55:13,230 - pyvisa - DEBUG - Created library wrapper for unset 2018-07-01 13:55:13,230 - pyvisa - DEBUG - Created ResourceManager with session 5906780 device = rm.open_resource("TCPIP::192.168.250.110::5024::SOCKET") 2018-07-01 13:55:29,797 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - opening ... 2018-07-01 13:55:29,805 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - is open with session 6964008 device.read_termination='\n' print(device.query("*IDN?")) 2018-07-01 13:55:56,604 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) Welcome to the SCPI instrument 'Siglent SDG2042X'

If I do the query via the socket interface I receive this response: Welcome to the SCPI instrument 'Siglent SDG2042X' Siglent Technologies,SDG2042X,SDG2XCAQ1R1528,2.01.01.23R5

What can I do to read the whole response?

ghost commented 6 years ago

I'm not familiar with read_bytes, what is the syntax for it?

Using the INSTR interface without specifying a port still fails:

import visa import time import binascii import sys visa.log_to_screen() rm = visa.ResourceManager('@py') 2018-07-01 14:11:17,373 - pyvisa - DEBUG - SerialSession was correctly imported. 2018-07-01 14:11:17,422 - pyvisa - DEBUG - USBSession and USBRawSession were correctly imported. 2018-07-01 14:11:17,443 - pyvisa - DEBUG - TCPIPSession was correctly imported. 2018-07-01 14:11:17,444 - pyvisa - DEBUG - GPIBSession was not imported No module named gpib. 2018-07-01 14:11:17,444 - pyvisa - DEBUG - Created library wrapper for unset 2018-07-01 14:11:17,445 - pyvisa - DEBUG - Created ResourceManager with session 6773778 device = rm.open_resource("TCPIP::192.168.250.110::INSTR") 2018-07-01 14:11:17,446 - pyvisa - DEBUG - TCPIP::192.168.250.110::INSTR - opening ... 2018-07-01 14:11:17,447 - pyvisa - DEBUG - RawTCPClient: connecting to socket at (192.168.250.110, 111) 2018-07-01 14:11:17,451 - pyvisa - DEBUG - Make call <PortMapperVersion.get_port: 3>, (395183, 1, 6, 0), <bound method PortMapperPacker.pack_mapping of <pyvisa-py.protocols.rpc.PortMapperPacker instance at 0xb5a9ce18>>, <bound method PortMapperUnpacker.unpack_uint of <pyvisa-py.protocols.rpc.PortMapperUnpacker instance at 0xb5a9ce40>> 2018-07-01 14:11:17,452 - pyvisa - DEBUG - Sending record through <socket._socketobject object at 0xb5a73b58>: '\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x01\x86\xa0\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x07\xaf\x00\x00\x00\x01\x00\x00\x00\x06\x00\x00\x00\x00' 2018-07-01 14:11:17,453 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb5a73b58>: bytearray(b'\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\xb5') 2018-07-01 14:11:17,454 - pyvisa - DEBUG - RawTCPClient: closing socket 2018-07-01 14:11:17,454 - pyvisa - DEBUG - RawTCPClient: connecting to socket at (192.168.250.110, 693) 2018-07-01 14:11:17,455 - pyvisa - DEBUG - Make call 10, (621311688L, 0, 10000, u'inst0'), <bound method Vxi11Packer.pack_create_link_parms of <pyvisa-py.protocols.vxi11.Vxi11Packer instance at 0xb5b70fd0>>, <bound method Vxi11Unpacker.unpack_create_link_resp of <pyvisa-py.protocols.vxi11.Vxi11Unpacker instance at 0xb5a90cb0>> 2018-07-01 14:11:17,455 - pyvisa - DEBUG - Sending record through <socket._socketobject object at 0xb51a87a0>: "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x07\xaf\x00\x00\x00\x01\x00\x00\x00\n\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00%\x08v\xc8\x00\x00\x00\x00\x00\x00'\x10\x00\x00\x00\x05inst0\x00\x00\x00" 2018-07-01 14:11:17,456 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb51a87a0>: bytearray(b'\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00') 2018-07-01 14:11:17,458 - pyvisa - DEBUG - TCPIP::192.168.250.110::INSTR - is open with session 4519833 device.read_termination='\n' print(device.query("IDN?")) 2018-07-01 14:11:58,092 - pyvisa - DEBUG - Make call 11, (0, 2000, 10000, 136, 'IDN?\r\n'), <bound method Vxi11Packer.pack_device_write_parms of <pyvisa-py.protocols.vxi11.Vxi11Packer instance at 0xb5b70fd0>>, <bound method Vxi11Unpacker.unpack_device_write_resp of <pyvisa-py.protocols.vxi11.Vxi11Unpacker instance at 0xb5a90cb0>> 2018-07-01 14:11:58,092 - pyvisa - DEBUG - Sending record through <socket._socketobject object at 0xb51a87a0>: "\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x07\xaf\x00\x00\x00\x01\x00\x00\x00\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xd0\x00\x00'\x10\x00\x00\x00\x88\x00\x00\x00\x07*IDN?\r\n\x00" 2018-07-01 14:11:58,095 - pyvisa - DEBUG - Received record through <socket._socketobject object at 0xb51a87a0>: bytearray(b'\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07') 2018-07-01 14:11:58,095 - pyvisa - DEBUG - TCPIP::192.168.250.110::INSTR - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 564, in query return self.read() File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 413, in read message = self._read_raw().decode(enco) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 386, in _read_raw chunk, status = self.visalib.read(self.session, size) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 318, in read ret = self.sessions[session].read(count) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/tcpip.py", line 105, in read start_time = time.monotonic() AttributeError: 'module' object has no attribute 'monotonic'

MatthieuDartiailh commented 6 years ago

Looking at the response you get when reading everything I wonder if the first part of the message is not written as soon as you open the connection. It may be said in the documentation. Could you try the following ?

For the INSTR, I believe you found a bug under Python 2. I will try to fix it ASAP.

ghost commented 6 years ago

Ok sounds good thanks! I'll try right now

ghost commented 6 years ago

I'm not sure that its sent immediately when the connection is opened, here is the response I get. The text isnt in the buffer until after the first command:

import visa import time import binascii import sys visa.log_to_screen() rm = visa.ResourceManager('@py') 2018-07-01 14:19:28,032 - pyvisa - DEBUG - Reusing ResourceManager with session 5298708 2018-07-01 14:19:28,032 - pyvisa - DEBUG - Reusing ResourceManager with session 5298708

device = rm.open_resource("TCPIP::192.168.250.110::INSTR")

... device = rm.open_resource("TCPIP::192.168.250.110::5024::SOCKET") 2018-07-01 14:19:28,034 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - opening ... 2018-07-01 14:19:28,034 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - opening ... 2018-07-01 14:19:28,038 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - is open with session 2460581 2018-07-01 14:19:28,038 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - is open with session 2460581 device.read_termination='\n' device.write_termination='\n' print(device.read_bytes(4096)) 2018-07-01 14:19:40,165 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 4096 bytes (last status None) 2018-07-01 14:19:40,165 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 4096 bytes (last status None) 2018-07-01 14:19:42,181 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'') 2018-07-01 14:19:42,181 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'') 2018-07-01 14:19:42,185 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - closing 2018-07-01 14:19:42,185 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - closing 2018-07-01 14:19:42,190 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - is closed 2018-07-01 14:19:42,190 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - is closed Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 342, in read_bytes chunk, status = self.visalib.read(self.session, size) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 323, in read raise errors.VisaIOError(ret[1]) pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. print(device.query("*IDN?")) 2018-07-01 14:21:42,917 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) 2018-07-01 14:21:42,917 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>) Welcome to the SCPI instrument 'Siglent SDG2042X' print(device.read_bytes(4096)) 2018-07-01 14:22:00,545 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 4096 bytes (last status None) 2018-07-01 14:22:00,545 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 4096 bytes (last status None) 2018-07-01 14:22:00,546 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 4035 bytes (last status <StatusCode.success_termination_character_read: 1073676293>) 2018-07-01 14:22:00,546 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - reading 4035 bytes (last status <StatusCode.success_termination_character_read: 1073676293>) 2018-07-01 14:22:02,563 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'\r>>Siglent Technologies,SDG2042X,SDG2XCAQ1R1528,2.01.01.23R5\n') 2018-07-01 14:22:02,563 - pyvisa - DEBUG - TCPIP::192.168.250.110::5024::SOCKET - exception while reading: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. Buffer content: bytearray(b'\r>>Siglent Technologies,SDG2042X,SDG2XCAQ1R1528,2.01.01.23R5\n') Traceback (most recent call last): File "", line 1, in File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa/resources/messagebased.py", line 342, in read_bytes chunk, status = self.visalib.read(self.session, size) File "/home/tinker/.local/lib/python2.7/site-packages/pyvisa-py/highlevel.py", line 323, in read raise errors.VisaIOError(ret[1]) pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.

MatthieuDartiailh commented 6 years ago

Can you try the other combinations I was suggesting ? Also can you try with a different query such as (SYST:COMM:LAN:IPAD?) ? Looking at the documentation of your instrument, they never discuss that extra first line you get, so it is a bit weird. Also can you try to uninstall and re-install pyvisa-py ? The error you get using TCPIP:INSTR, should not be present on master since we never call time.monotonic, so your install is a bit weird.

ghost commented 6 years ago

Hi Matthieu, certainly I would love to reinstall pyvisa-py. What are the sequence of commands I should use for that? I would like to do it exactly as you would like, so we have a common starting point.

As soon as the software is re-installed I will try with the other commands

MatthieuDartiailh commented 6 years ago

Sorry for the delay. To uninstall you should run the following command: pip uninstall pyvisa-py Then re-install using: pip install https://github.com/pyvisa/pyvisa-py/zipball/master

Note that the repo moved to an organization by installing from hgrecco, you probably picked some old version.

MatthieuDartiailh commented 6 years ago

Actually your install is fine (my local master branch was outdated...) I fixed the bug you were seeing. So you can test again after re-installing to get the fix.