pylab_ml.smu.tti.ql355tp.QL355TP

class QL355TP(addr=None, interface=None, backend=None, identify=True, instName=None)[source]

Bases: TTI

Interface to the Power supply unit TTi QL355TP.

Date:: June 16, 2026
Author:: Semi-ATE <info@Semi-ATE.org>

The QL355TP can supply two voltage sources and limit its current.

Manual

Examples:

Common for QL355TP: examples/smu/ql355tp.py

__init__(addr=None, interface=None, backend=None, identify=True, instName=None)[source]

Connect and initialize.

Parameters:

addr (int) – Interface address
interface (Interface) –

To select the bus type, the same bus must also be selected on the instrument. For selection : Control 2, SHIFt 6 and then make the right selection with the rotary wheel.
- GPIB
- USBSerial:
  
  for serial or usb
  
  The serial bus only works with a special cable (rts must be connect to cts)
  
  USB works only with windows. Please install the driver ‘instruments/smu/tti/TTI_USB_FTDI-v2_12_16’
backend (str) – VISA backend is either ‘@ni’ for NI-Library or ‘@py’ for pure python pyvisa-py backend. On default it uses ‘@ni’ on win32 and ‘@py’ on other platforms.
identify (bool) – Whether to identify the instrument. The default is True.
instName (string) – Instance Name from top.
Example – Initialization >>> vdd = QL355TP(11, ‘vdd’) # GPIB address=11 >>> vdd.init() # connect and initialize instrument with 2 channels
Example – Config power supply 1+2 and enable the output >>> vdd[0].voltage = 5.0 # voltage (@channel=0) = 5V >>> vdd[0].current_lim = 0.01 # current limit = 10mA >>> vdd[0].onoff = 1 # enable output 0 >>> vdd[1].voltage = 6.3 # voltage (@channel=1) = 6.3V >>> vdd[1].current_lim = 0.58 # current limit = 580mA >>> vdd[1].onoff = 1 # enable output 0

Methods

`__init__`([addr, interface, backend, ...])	Connect and initialize.
`clear`()	Clear error status.
`close`([force])	Close connection to instrument.
`createattributes`(dictionary[, parent, ...])	Create attributes or methods from a dictionary.
`errmsg`()	Read Execution Error Register.
`find_names`()	find_names() returns list of identifiers strings, lhs of = assignments
`help`()	Print the docstring of the instrument class.
`identify`([showInstName])	Identify message.
`init`([identify])	Connect to TTI instrument and initialize.
`local`()	Switch back to local instrument control.
`message`([message])	Device has no display, message display to logger.info.
`mfilter`(input)
`mqtt_add`(client, instrument[, liste, qos])	Add the instrument to mqtt.
`mqtt_disconnect`()	Remove the instrument from mqtt.
`publish`(topic, value)	Publish topic as type='cmd' with payload=value.
`publish_get`(function_name, value)	Publish function_name as type='get' with paylad=value.
`publish_set`(function_name, value)	Publish function_name as type='set' with paylad=value.
`read`()	Read the instruent directly.
`reset`()	Reset and switch beep off.
`setup_inst`()	Start setup instrument settings, called from class instruments.
`write`(cmd)	Write direct to instrument.

Attributes

`channel`	Set/get channel number if the instrument have more than one channel.
`command`
`current`	Measure DC current of actual Channel.
`i_clamp`	Set the current clamping (A) of actual Channel.
`id`	Query IDN.
`instName`	Return with instname or instname[ch] if it has channels.
`interchoices`
`measurecnt`	Set/get the number of measurement to be carried out in a loop.
`mqtt_enable`
`mqtt_list`
`mqtt_status`	Getter for the mqtt_status.
`ocp`	Get/Set over current protection trip point at x Amps.
`onoff`	Get/Set the Output-State of actual Channel.
`ovp`	Get/Set over voltage protection trip point at x Volts.
`sense`	Get/Set sense.
`state`	Get/Set Standard Event Status Enable Register.
`v_range`	Get/Set the operating Output-Value-Range for actual Channel.
`voltage`	Get/Set voltage.
`ATTR_ERROR`	if something wrong with your called methode, than set the result to self.ATTR_ERROR
`attrLast`	last set/get attribute name.
`attrLastvalue`	last set attribute value.

ATTR_ERROR: if something wrong with your called methode, than set the result to self.ATTR_ERROR

class Sense(value)

Bases: Enum

Enum for Sense control.

local = 0: value for sense mode = local

remote = 1: value for sense mode = remote

attrLast: last set/get attribute name.

attrLastvalue: last set attribute value.

property channel

Set/get channel number if the instrument have more than one channel.

One can also use:

>>> vdd[0].voltage = 5           # set voltage from channel 0
>>> vdd[1].current = 0.1         # set current from channel 1
>>> v = vdd[1].voltage           # measure voltage from channel 1

clear(): Clear error status.

close(force=False): Close connection to instrument.

createattributes(dictionary, parent=None, child=None, childname='')

Create attributes or methods from a dictionary.

Syntax from the dictionary see example in the class documentation.

Parameters:

dictionary (dict) – The dictionary with the syntax: {attribute/methode name : (Device command for read/write) , range, call functions}.
parent (create_attributes, optional) – If you want to create a child, than you have to set the parent, otherwise None, by default None.
child (str, optional) – The name of the child, by default None.
childname (str, optional) – The name of the child, by default ‘’.

Return type:

None.

property current: Measure DC current of actual Channel.

errmsg(): Read Execution Error Register.

find_names()

find_names() returns list of identifiers strings, lhs of = assignments

Returns:: obj_names – List of identifier strings
Return type:: list of str

help(): Print the docstring of the instrument class.

property i_clamp: Set the current clamping (A) of actual Channel.

property id: Query IDN.

identify(showInstName=False): Identify message.

init(identify=False)

Connect to TTI instrument and initialize.

Parameters:: identify (bool, optional) – Whether to identify the instrument. The default is False.

property instName: Return with instname or instname[ch] if it has channels.

json = <module 'json' from '/home/runner/miniconda3/envs/test/lib/python3.9/json/__init__.py'>

local(): Switch back to local instrument control.

property measurecnt

Set/get the number of measurement to be carried out in a loop.

TODO: this function is not running yet, it is only a dummy

if the result == None than this function not implemented. The return value for the measurement is calculated togetheer with the mfilter setting.

message(message=None): Device has no display, message display to logger.info.

mqtt_add(client, instrument, liste='#', qos=0)

Add the instrument to mqtt. Calling from base_instrument, after the instrument (device) has been create. Normally you have not to use this function, only base_instrument use it.

Parameters:

client (mqtt_init) – The MQTT client instance to which the instrument should be added.
instrument (object) – The instrument to be added to the MQTT client.
liste (list or str) – A list of attributes for which MQTT messages should be sent. If set to “#”, all attributes will be included (default: “#”).
qos (int) – The Quality of Service level for MQTT messages (default: 0).

Return type:

None

mqtt_disconnect(): Remove the instrument from mqtt. Calling from base_instrument, if the instrument are closing. Normally you have not to use this function, only base_instrument use it.

property mqtt_status: Getter for the mqtt_status.

property ocp: Get/Set over current protection trip point at x Amps.

property onoff: Get/Set the Output-State of actual Channel.

0 = Output off

1 = Output on

property ovp: Get/Set over voltage protection trip point at x Volts.

publish(topic, value)

Publish topic as type=’cmd’ with payload=value.

Parameters:

topic (str) – The name of the topic to publish.
value (any) – The value to be published.

Return type:

None

publish_get(function_name, value)

Publish function_name as type=’get’ with paylad=value.

Parameters:

function_name (str) – The name of the function to be published as a ‘get’ command.
value (any) – The value to be published as the payload of the ‘get’ command.

Return type:

None

publish_set(function_name, value)

Publish function_name as type=’set’ with paylad=value.

Parameters:

function_name (str) – The name of the function to be published as a ‘set’ command.
value (any) – The value to be published as the payload of the ‘set’ command.

Return type:

None

read(): Read the instruent directly.

reset(): Reset and switch beep off.

property sense: Get/Set sense.

‘local’ = Local sensing (2-Wire)

‘remote’ = Remote sensing (4-Wire)

setup_inst()[source]

Start setup instrument settings, called from class instruments.

Create 2 channels

property state

Get/Set Standard Event Status Enable Register.

See QL355T Instruction Manual for more details

property v_range: Get/Set the operating Output-Value-Range for actual Channel.

0 = 15V/5A’ : Voltage 0 to 15 V / Current 0 to 5 A

1 = 35V/3A’ : Voltage 0 to 35 V / Current 0 to 3 A

2 = 35V/500mA : Voltage 0 to 35 V / Current 0 to 500 mA

property voltage: Get/Set voltage.

write(cmd)

Write direct to instrument.

Example: send command reset :

>>> inst.write('*RST')

Parameters:: cmd (str) – Command to send to instrument, use $ for channel number.