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MyTpg.m
7a9291bd2aa9TekRSA-Freq-vs-Time

MyTpg.m
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			% Class for communication with Pfeiffer TPG single and dual pressure gauge
			% controllers.
			% Use 'serial' communication objects instead of 'visa' with this instrument
			% Tested with TPG 262 and 362.

			classdef MyTpg < MyInstrument & MyCommCont

			properties (Constant = true, Access = protected)

			% Named constants for communication
			ETX = char(3); % end of text
			CR = char(13); % carriage return \r
			LF = char(10); %#ok<CHARTEN> line feed \n
			ENQ = char(5); % enquiry
			ACK = char(6); % acknowledge
			NAK = char(21); % negative acknowledge
			end

			properties (SetAccess = protected, GetAccess = public, ...
			SetObservable = true)

			% Last measurement status
			gauge_stat = {'', ''};
			end

			methods (Access = public)
			function this = MyTpg(varargin)
			this@MyCommCont(varargin{:});
			createCommandList(this);
			end

			% read pressure from a single channel or both channels at a time
			function p_arr = readPressure(this)
			queryString(this, ['PRX', this.CR, this.LF]);
			str = queryString(this, this.ENQ);

			% Extract pressure and gauge status from reading.
			arr = sscanf(str,'%i,%e,%i,%e');
			p_arr = transpose(arr(2:2:end));

			% Status codes:
			% 0 > Measurement data okay
			% 1 > Underrange
			% 2 > Overrange
			% 3 > Sensor error
			% 4 > Sensor off (IKR, PKR, IMR, PBR)
			% 5 > No sensor (output: 5,2.0000E-2 [hPa])
			% 6 > Identification error
			this.gauge_stat{1} = gaugeStatusFromCode(this, arr(1));
			this.gauge_stat{2} = gaugeStatusFromCode(this, arr(3));
			end

			function pu = readPressureUnit(this)
			queryString(this, ['UNI',this.CR,this.LF]);
			str = queryString(this, this.ENQ);

			% Pressure units correspondence table:
			% 0 > mbar/bar
			% 1 > Torr
			% 2 > Pascal
			% 3 > Micron
			% 4 > hPascal (default)
			% 5 > Volt
			pu_code = sscanf(str,'%i');
			pu = pressureUnitFromCode(this, pu_code);
			end

			function id_list = readGaugeId(this)
			queryString(this, ['TID',this.CR,this.LF]);
			str = queryString(this, this.ENQ);

			id_list = deblank(strsplit(str,{','}));
			end

			function code_list = turnGauge(this)
			queryString(this, ['SEN',char(1,1),this.CR,this.LF]);
			str = queryString(this, this.ENQ);
			code_list = deblank(strsplit(str,{','}));
			end

			% Attempt communication and identification of the device
			function [str, msg] = idn(this)
			try
			queryString(['AYT', this.CR, this.LF]);
			str = queryString(this.ENQ);
			catch ME
			str = '';
			msg = ME.message;
			end

			this.idn_str = toSingleLine(str);
			end

			% Create pressure logger
			function Lg = createLogger(this, varargin)

			Lg = MyLogger(varargin{:}, 'MeasFcn', @this.readPressure);

			pu = this.pressure_unit;
			if isempty(Lg.Record.data_headers) && ~isempty(pu)
			Lg.Record.data_headers = ...
			{['P ch1 (' pu ')'], ['P ch2 (' pu ')']};
			end
			end
			end

			methods (Access = protected)
			function createCommandList(this)
			addCommand(this, 'pressure', ...
			'readFcn', @this.readPressure, ...
			'default', [0, 0]);

			addCommand(this, 'pressure_unit', ...
			'readFcn', @this.readPressureUnit, ...
			'default', 'mBar');

			addCommand(this, 'gauge_id', ...
			'readFcn', @this.readGaugeId, ...
			'default', {'', ''});
			end

			function createMetadata(this)
			createMetadata@MyInstrument(this);

			addObjProp(this.Metadata, this, 'gauge_stat', ...
			'comment', 'Last measurement status');
			end

			% Convert numerical code for gauge status to a string
			function str = gaugeStatusFromCode(~, code)
			switch int8(code)
			case 0
			str = 'Measurement data ok';
			case 1
			str = 'Underrange';
			case 2
			str = 'Overrange';
			case 3
			str = 'Sensor error';
			case 4
			str = 'Sensor off';
			case 5
			str = 'No sensor';
			case 6
			str = 'Identification error';
			otherwise
			str = '';
			warning('Unknown gauge status code %i', code);
			end
			end

			% Convert numerical code for pressure unit to a string
			function str = pressureUnitFromCode(~, code)
			switch int8(code)
			case 0
			str = 'mBar';
			case 1
			str = 'Torr';
			case 2
			str = 'Pa';
			case 3
			str = 'Micron';
			case 4
			str = 'hPa';
			case 5
			str = 'Volt';
			otherwise
			str = '';
			warning('unknown pressure unit, code=%i',pu_num)
			end
			end
			end
			end

rINSTCONTROL/@MyTpg/MyTpg.m7a9291bd2aa9TekRSA-Freq-vs-Time

MyTpg.mView Options

rINSTCONTROL/@MyTpg/MyTpg.m
7a9291bd2aa9TekRSA-Freq-vs-Time

MyTpg.m
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