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pyvisa / pyvisa-py

A pure python PyVISA backend
https://pyvisa-py.readthedocs.io
MIT License
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write command does not take affect #90

Closed memanj closed 6 years ago

memanj commented 8 years ago

Hi I am trying to automate setting voltage and querying ccurrent from Keithley 2220-31 DC power supply. I am getting success (24,\ <StatusCode.success: 0>) for all the commands I am trying to write. But nothing is changing on the power supply display. Any comments on this is much appreciated

import visa rm = visa.ResourceManager('@py') list_re = rm.list_resources() my_instrument = rm.open_resource(list_re[0]) my_instrument.query('*IDN?') u'Keithley instruments, 2220-30-1, 9102079, 1.15-1.04\n'

my_instrument.write('Output 1') (24, <StatusCode.success: 0>) my_instrument.write('VOltage 12') (24, <StatusCode.success: 0>)

python -m visa info Machine Details: Platform ID: Linux-3.13.0-24-generic-x86_64-with-Ubuntu-14.04-trusty Processor: x86_64

Python: Implementation: CPython Executable: /usr/bin/python Version: 2.7.6 Compiler: GCC 4.8.2 Bits: 64bit Build: Mar 22 2014 22:59:56 (#default) Unicode: UCS4

PyVISA Version: 1.8

Backends: ni: Version: 1.8 (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: 0.2 ASRL INSTR: Please install PySerial to use this resource type. No module named serial TCPIP INSTR: Available USB RAW: Available via PyUSB (1.0.0). Backend: libusb1 USB INSTR: Available via PyUSB (1.0.0). Backend: libusb1 GPIB INSTR: Please install linux-gpib to use this resource type. No module named gpib TCPIP SOCKET: Available

samdejong86 commented 6 years ago

Were you able to solve this? I seem to be having the same issue.

MatthieuDartiailh commented 6 years ago

Some quick questions:

samdejong86 commented 6 years ago

` $ python -m visa info Machine Details: Platform ID: Linux-4.4.0-128-generic-x86_64-with-debian-stretch-sid Processor: x86_64

Python: Implementation: CPython Executable: /hepuser/srdejong/miniconda3/bin/python Version: 3.6.3 Compiler: GCC 7.2.0 Bits: 64bit Build: Nov 20 2017 20:41:42 (#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) 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' `

I am trying to connect to a keithley 2220-30-1 DC power supply. I haven't communicated using the ni backend, since I'm on ubuntu and haven't found a way to install the ni visa.

I have not explicitly set the termination character.

samdejong86 commented 6 years ago

I think I have found my problem. I have to set the device to remote control using

inst.write("SYSTEM:REMOTE")

having added that line, I can now send commands

MatthieuDartiailh commented 6 years ago

Great you solved your issue !