1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#
# This file is part of the PyMeasure package.
#
# Copyright (c) 2013-2024 PyMeasure Developers
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import pyvisa
from serial.tools import list_ports
def list_resources():
"""
Prints the available resources, and returns a list of VISA resource names
.. code-block:: python
resources = list_resources()
#prints (e.g.)
#0 : GPIB0::22::INSTR : Agilent Technologies,34410A,******
#1 : GPIB0::26::INSTR : Keithley Instruments Inc., Model 2612, *****
dmm = Agilent34410(resources[0])
"""
rm = pyvisa.ResourceManager()
instrs = rm.list_resources()
for n, instr in enumerate(instrs):
# trying to catch errors in communication
try:
res = rm.open_resource(instr)
# try to avoid errors from *idn?
try:
# noinspection PyUnresolvedReferences
idn = res.query('*idn?')[:-1]
except pyvisa.Error:
idn = "Not known"
finally:
res.close()
print(n, ":", instr, ":", idn)
except pyvisa.VisaIOError as e:
print(n, ":", instr, ":", "Visa IO Error: check connections")
print(e)
rm.close()
return instrs
def find_serial_port(vendor_id=None, product_id=None, serial_number=None):
"""Find the VISA port name of the first serial device with the given USB information.
Use `None` as a value if you do not want to check for that parameter.
.. code-block:: python
resource_name = find_serial_port(vendor_id=1256, serial_number="SN12345")
dmm = Agilent34410(resource_name)
:param int vid: Vendor ID.
:param int pid: Product ID.
:param str sn: Serial number.
:return str: Port as a VISA string for a serial device (e.g. "ASRL5" or "ASRL/dev/ttyACM5").
"""
for port in sorted(list_ports.comports()):
if ((vendor_id is None or port.vid == vendor_id)
and (product_id is None or port.pid == product_id)
and (serial_number is None or port.serial_number == str(serial_number))):
# remove "COM" from windows serial port names.
port_name = port.device.replace("COM", "")
return "ASRL" + port_name
raise AttributeError("No device found for the given data.")
|
