serial-controllers

Several basic controller classes for serial hardware such as DMMs (Digital Multimters) and PSUs (Power Supplies).

Functionality

The controller classes support only the most basic and routinely used functionality such as get_input (returns current reading), and set_output (configures output limits on PSUs):

Example DMM use

from serial_controllers import AgilentU12xxxDmm

dmm = AgilentU12xxxDmm('COM9') #<-- Remember to change the port
## Not sure which port name to type in?
## Try this script! -> https://github.com/mjablons1/scpi-hw-discovery
dmm.initialize()

primary_reading, primary_unit = dmm.get_input(1)
secondary_reading, secondary_unit = dmm.get_input(2)

print(f' CH1_READING:{primary_reading} {primary_unit}\n CH2_READING:{secondary_reading} {secondary_unit}\n')
dmm.finalize() # releases serial resource

Example PSU use

from serial_controllers import Tti2ChPsu
from time import sleep

psu = Tti2ChPsu('COM10') #<-- Remember to change the port
## Not sure which port name to type in?
## Try this script! -> https://github.com/mjablons1/scpi-hw-discovery
psu.initialize()

psu.set_output(1, voltage=1.2, current=0.01)
psu.set_output(2, voltage=2.2, current=0.02)

psu.engage_output((1, 2)) # engages output on channel 1 and 2 after user approval
sleep(2)

psu.disengage_output(1) # disengages only output 1 (output 2 remains engaged)
sleep(2)

psu.engage_output(2, seek_permission=False) # after this only channel 2 will be engaged and without user approval!
sleep(2)

volts, v_unit, current, i_unit = psu.get_input(2)
print(f'Reading:{volts}{v_unit} and {current}{i_unit}\n')

psu.set_output(2, voltage=3, current=0.03) # WARNING!: You can manipulate levels on engaged output.

psu.disengage_output() # this immediately shuts down all engaged channels simultaneously
psu.finalize() # releases serial resource

Currently supported devices

NOTE: Some versions of below devices may require adjustments due to inconsistencies in the protocols.

Multimeters (DMMs):

Brand	Model	serial-controllers supporting class	Verified with	Comments
Keysight / Agilent	U12xxx	AgilentU12xxxDmm	Keysight U1253B
Fluke	28x	Fluke28xDmm	Fluke 289

Power Supplies (PSUs):

Brand	Model	serial-controllers supporting class	Verified with	Comments
TTI	CPX400DP	Tti2ChPsu	*
TTI	CPX400SP	Tti1ChPsu
TTI	PL155-P(G)	Tti1ChPsu	*
TTI	PL068-P(G)	Tti1ChPsu
TTI	PL303-P(G)	Tti1ChPsu
TTI	PL601-P(G)	Tti1ChPsu
TTI	PL303QMD-P(G)	Tti2ChPsu
TTI	PL303QMT-P(G)	Tti3ChPsu
TTI	EL302P-USB	N.A.		not supported
TTI	EX355P-USB	N.A.		not supported
TTI	QL355TP	TtiQL2ChPsu		operates at 19200 baud rate by default
TTI	QL355P	TtiQL1ChPsu		operates at 19200 baud rate by default
TTI	QL564TP	TtiQL2ChPsu		operates at 19200 baud rate by default
TTI	QL564P	TtiQL1ChPsu		operates at 19200 baud rate by default
Rohde & Schwarz	HMP2030	RohdeHmp3ChPsu
Rohde & Schwarz	HMP4040	RohdeHmp4ChPsu	*

Spectrometers:

Brand	Model	serial-controllers supporting class	Verified with	Comments
GL Optic	Touch 1.0	GlOpticTouch	*	Requires GL Spectrosoft PRO which runs a TCP server that relays the measurement data from the spectrometer. See HW manuals/gl_parsing_result.txt for example dict structure returned by get_input().

Acknowledgements

1. The base class relies on a modified SimpleDaq class from Python For the Lab materials. link to source
2. Sigrok website where lots of devices protocols are reverse-engineered. Beautiful middle finger solution in case your hw supplier refuses to cooperate. Sigrok homepage