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Visa allow setting custom resource args. #5485

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Visa allow setting custom resource args. #5485

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24 changes: 17 additions & 7 deletions src/qcodes/instrument/visa.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,9 @@
``qcodes.instruments.sims:AimTTi_PL601P.yaml`` in which case it is loaded
from the supplied module. Note that it is an error to pass both
``pyvisa_sim_file`` and ``visalib``.
visa_kwargs: Keyword arguments passed to PyVisas `ResourceManager().open_resource`

Check notice on line 67 in src/qcodes/instrument/visa.py

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src/qcodes/instrument/visa.py#L67 

Line too long (90/88)
This allows setting custom properties for a Visa connection such as serial
baud rate. See PyVisa docs for additional options.

See help for :class:`.Instrument` for additional information on writing
instrument subclasses.
Expand All @@ -79,6 +82,7 @@
device_clear: bool = True,
visalib: str | None = None,
pyvisa_sim_file: str | None = None,
visa_kwargs: dict[str, Any] | None = None,
**kwargs: Any,
):

Expand All @@ -98,6 +102,8 @@
"It's an error to supply both visalib and pyvisa_sim_file as "
"arguments to a VISA instrument"
)
if visa_kwargs is None:
visa_kwargs = {}
if pyvisa_sim_file is not None:
if ":" in pyvisa_sim_file:
module, pyvisa_sim_file = pyvisa_sim_file.split(":")
Expand All @@ -116,10 +122,12 @@
visa_handle,
visabackend,
resource_manager,
) = self._connect_and_handle_error(address, visalib)
) = self._connect_and_handle_error(
address, visalib, visa_kwargs=visa_kwargs
)
else:
visa_handle, visabackend, resource_manager = self._connect_and_handle_error(
address, visalib
address, visalib, visa_kwargs=visa_kwargs
)
finalize(self, _close_visa_handle, visa_handle, str(self.name))

Expand All @@ -142,11 +150,13 @@
self.timeout.set(timeout)

def _connect_and_handle_error(
self, address: str, visalib: str | None
self, address: str, visalib: str | None, visa_kwargs: dict[str, Any]
) -> tuple[pyvisa.resources.MessageBasedResource, str, pyvisa.ResourceManager]:
try:
visa_handle, visabackend, resource_manager = self._open_resource(
address, visalib
address,
visalib,
visa_kwargs=visa_kwargs,
)
except Exception as e:
self.visa_log.exception(f"Could not connect at {address}")
Expand All @@ -155,7 +165,7 @@
return visa_handle, visabackend, resource_manager

def _open_resource(
self, address: str, visalib: str | None
self, address: str, visalib: str | None, visa_kwargs: dict[str, Any]
) -> tuple[pyvisa.resources.MessageBasedResource, str, pyvisa.ResourceManager]:

# in case we're changing the address - close the old handle first
Expand All @@ -174,7 +184,7 @@
visabackend = "ivi"

self.visa_log.info(f"Opening PyVISA resource at address: {address}")
resource = resource_manager.open_resource(address)
resource = resource_manager.open_resource(address, **visa_kwargs)
if not isinstance(resource, pyvisa.resources.MessageBasedResource):
resource.close()
raise TypeError("QCoDeS only support MessageBasedResource Visa resources")
Expand All @@ -192,7 +202,7 @@
(and then call this function).
"""
resource, visabackend, resource_manager = self._open_resource(
address, self.visalib
address, self.visalib, {}
)
self.visa_handle = resource
self._address = address
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