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Unable to read DIO status #4

Description

@JayeshEngibrains

I am trying to read DIO for my application but I am running into execption attached below in below provided example. Actual path from error has been removed for anonamity.
https://github.com/BloomyControls/BS1200-Python-Driver/blob/main/tests/dio_test.py

We are using below version of software
bs1200 - 1.3.6
python -3.7.8

..\venv\Scripts\python.exe ..\dio.py
..\venv\lib\site-packages\paramiko\pkey.py:100: CryptographyDeprecationWarning: TripleDES has been moved to cryptography.hazmat.decrepit.ciphers.algorithms.TripleDES and will be removed from this module in 48.0.0.
"cipher": algorithms.TripleDES,
..\venv\lib\site-packages\paramiko\transport.py:259: CryptographyDeprecationWarning: TripleDES has been moved to cryptography.hazmat.decrepit.ciphers.algorithms.TripleDES and will be removed from this module in 48.0.0.
"class": algorithms.TripleDES,
Fan Status: No Fault
Temp Sensor 1: 30 °C
Temp Sensor 2: 30 °C
Temp Sensor 3: 29 °C
Traceback (most recent call last):
File "..\dio.py", line 10, in
ai_v = bs.readback_ai_all(box)
File "..\venv\lib\site-packages\bs1200\driver.py", line 380, in readback_ai_all
ai_volts[channel-1] = self.scale_volts(int.from_bytes(rx_frames[frame].data[start:end], 'little'), True)
AttributeError: 'NoneType' object has no attribute 'data'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "..\dio.py", line 22, in
print("DIO1:\t{:b} | DIO2:\t{:b} | DIO3:\t{:b} | DIO4:\t{:b} \nDIO5:\t{:b} | DIO6:\t{:b} | DIO7:\t{:b} | DIO8:\t{:b}".format(*bs.readback_dio(box)))
File "..\venv\lib\site-packages\bs1200\driver.py", line 51, in exit
sys.tracebacklimit.print_exception(exception_type, execption_val, tb)
AttributeError: module 'sys' has no attribute 'tracebacklimit'

Process finished with exit code 1

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