9. Software simulator

The PSU firmware can be compiled and executed on a Windows, Linux or OS X system. The software simulator is a terminal application that can respond to any currently supported SCPI command described in this document. SCPI commands could be entered directly in the simulator’s terminal window (Fig. 1) or remotely by using the e.g. a Telnet client (Fig. 2).

Fig. 1: Simulator welcome screen

Fig. 2: Remote connection using a telnet client

The simulator also has an internal GUI. When started, open a separate window with the picture of the PSU front panel. The GUI depends of which PSU revision is used that can be set in conf_user_revision.h file before simulator compilation.

Fig. 3: Simulator GUI for portrait front panel (r1B9)

Fig. 4: Simulator GUI for landscape front panel (r3B4)

The GUI simulator front panel currently displays only changes in LED indicators and indicates whether load is applied on the output terminals or not. For example if an 8.2 Ohm load is connected to channel 2 and causes that channel to enter CC mode, the GUI front panel will indicate that in the following way:

Fig. 5: Simulator GUI with a connected load on channel 2 (r5B12)

9.1. SIMUlator

The SIMUlator software subsystem implements a set of unclassified SCPI commands for managing external parameters and events such as load impedance, connection and disconnection of the load, sensor temperature or the PSU control circuit power supply state. Thus it is possible to exercise the measuring and protection commands that depend on external events.

For example, a MEASure:CURRent? command without a connected load will always return zero, or activation of the VOLTage:PROTection:STATe will automatically trip the OVP signal since a channel in CC operation cannot start when output is switched on, etc.

SCPI command	Description
SIMUlator
:EXIT	Closes simulator
:GUI	Starts simulator’s GUI
:LOAD {<resistance>}	Sets the value of the simulated load
:STATe {<bool>}	“Connects” a simulated load to the channel output
:PIN1 {<bool>}	Sets the value of the PIN1 input
:PWRGood {<bool>}	Sets the PWRGOOD signal state
:QUIT	Closes simulator
:RPOL {<bool>}	Sets the RPOL signal
:TEMP {<temperature>}	Sets the temperature sensor value
:VOLT:PROG:EXT {<voltage>}	Sets the output voltage when a channel is in external programming mode

9.1.1. SIMUlator:EXIT

Syntax	SIMUlator:EXIT
Description	This command close all Simulator windows (terminal and GUI if started).
Usage example	SIMU:EXIT

9.1.2. SIMUlator:GUI

Syntax	SIMUlator:GUI
Description	This command starts the GUI simulation in a new window (see Fig. 3 and Fig. 4).
Usage example	SIMU:GUI
Related Commands	SIMUlator:EXIT

9.1.3. SIMUlator:LOAD

Syntax	SIMUlator:LOAD {<resistance>} SIMUlator:LOAD?
Description	This command define the impedance of a simulated load connected to a channel output. Units are in ohms. With a load connected it is possible to simulate several PSU operations: e.g., CC mode of operation, current and power measurement, OCP and OPP functionality, etc. The simulated load value can be also changed by clicking and dragging the load’s image. Move to the left to decrease, or to the right to increase the simulated value in increments of 1 Ω. The simulator currently cannot emulate the “UR” mode of operation (see the OUTPut:MODE? command).
Parameters	Name	Type	Range	Default
	<resistance>	NR2\|Discrete	0 – 9999999\|INFinite	–
Return	The query command returns the programmed load value.
Usage example	SIMU:LOAD 8.2
Related Commands	OUTPut:MODE?

9.1.4. SIMUlator:LOAD:STATe

Syntax	SIMUlator:LOAD:STATe {<bool>} SIMUlator:LOAD:STATe?
Description	This command “connects” or “disconnects” the simulated load on the channel output. If the GUI simulator has been started (via the SIMUlator:GUI command) a load symbol with the currently selected value in Ohms will be displayed (See Fig. 5). Another possibility to connect (or disconnect) a load is by click on its image.
Parameters	Name	Type	Range	Default
	<bool>	Boolean	ON\|OFF\|0\|1	–
Return	The query command returns the load state.
Usage example	SIMU:LOAD:STAT? 0 MEAS:CURR? 0.00 SIMU:LOAD:STAT ON MEAS:CURR? 1.50
Related Commands	OUTPut:MODE? SIMUlator:GUI SIMUlator:LOAD

9.1.5. SIMUlator:PIN1

Syntax	SIMUlator:PIN1 {<bool>} SIMUlator:PIN1?
Description	This command can be used to simulate the state of the PIN1 input on the PSU front panel push-in connector that can be used for initiate trigger.
Parameters	Name	Type	Range	Default
	<bool>	Boolean	ON\|OFF\|0\|1	–
Return	The query command returns the state of the simulated PIN1 input.
Usage example	VOLT:TRIG 12.00 CURR:TRIG 2.50 TRIG:SOUR PIN1 OUTP 1 INIT SIMU:PIN1
Related Commands	ABORt INITiate[:IMMediate] TRIGger[:SEQuence]:DELay TRIGger[:SEQuence]:SLOPe TRIGger[:SEQuence]:SOURce

9.1.6. SIMUlator:PWRGood

Syntax	SIMUlator:PWRGood {<bool>} SIMUlator:PWRGood?
Description	This command can be used to simulate an internal power supply failure. When the PWRGOOD signal is changed from 1 to 0 the PSU will go into the Stand-by mode (equal to the command SYSTem:POW OFF). The simulated PSU mode cannot be changed until PWRGOOD is not changed to 1.
Parameters	Name	Type	Range	Default
	<bool>	Boolean	ON\|OFF\|0\|1	ON
Return	The query command returns the PWRGOOD signal state.
Usage example	SYST:POW? 1 SIMU:PWRG 0 SYST:POW? 0
Related Commands	SYSTem:POWer

9.1.7. SIMUlator:QUIT

Syntax	SIMUlator:QUIT
Description	Same as SIMUlator:EXIT
Usage example	SIMU:QUIT

9.1.8. SIMUlator:RPOL

Syntax	SIMUlator:RPOL {<bool>} SIMUlator:RPOL?
Description	This command can be used to simulate detection of a remote sensing reverse polarity condition.
Parameters	Name	Type	Range	Default
	<bool>	Boolean	ON\|OFF\|0\|1	ON
Return	The query command returns the RPOL signal state.
Usage example	STAT:QUES:INST:ISUM2? 0 SIMU:RPOL 1 STAT:QUES:INST:ISUM2? 128
Errors	312,"Cannot execute when the channels are coupled"
Related Commands	INSTrument:COUPle:TRACking [SOURce[<n>]]:VOLTage:SENSe[:SOURce] STATus:QUEStionable:INSTrument[:EVENt]?

9.1.9. SIMUlator:TEMPerature

Syntax	SIMUlator:TEMPerature {<temperature>} [, <sensor>] SIMUlator:TEMPerature? [<sensor>]
Description	This command sets the simulated temperature in degrees Celsius (oC), and then reads it from the simulated temperature sensor.
Parameters	Name	Type	Range	Default
	<temperature>	NR2	0 – 100	–
	<sensor>	Discrete	AUX\|CH1\|CH2	AUX
Return	The query command returns the set temperature value.
Usage example	SIMU:TEMP 45, CH2 MEAS:TEMP? CH2 45.00
Related Commands	MEASure[:SCALar]:TEMPerature[:THERmistor][:DC]

9.1.10. SIMUlator:VOLTage:PROGram:EXTernal

Syntax	SIMUlator:VOLTage:PROGram:EXTernal {<voltage>} SIMUlator:VOLTage:PROGram:EXTernal?
Description	This command sets the simulated voltage that will be used for output voltage programming when the simulated channel is set in external / remote programming mode (see [SOURce[<n>]]:VOLTage:PROGram[:SOURce]). For full range, apply 2.5 V; if a higher value is entered channel’s OVP will trip.
Parameters	Name	Type	Range	Default
	<voltage>	NR2	Positive value	0.00
Return	The query command returns the simulated external output voltage programming value.
Usage example	VOLT:PROG EXT SIMU:VOLT:PROG:EXT 1.25 MEAS? 20.00
Errors	312,"Cannot execute when the channels are coupled"
Related Commands	INSTrument:COUPle:TRACking [SOURce[<n>]]:VOLTage:PROGram[:SOURce] [SOURce[<n>]]:VOLTage:PROTection:TRIPped?

{jd_file file==1}

Cookie	Duration	Description
__cfduid	1 month	The cookie is used by cdn services like CloudFare to identify individual clients behind a shared IP address and apply security settings on a per-client basis. It does not correspond to any user ID in the web application and does not store any personally identifiable information.
cookielawinfo-checkbox-advertisement	1 year	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Advertisement".
cookielawinfo-checkbox-analytics	1 year	This cookies is set by GDPR Cookie Consent WordPress Plugin. The cookie is used to remember the user consent for the cookies under the category "Analytics".
cookielawinfo-checkbox-necessary	1 year	This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-performance	1 year	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
PHPSESSID	session	This cookie is native to PHP applications. The cookie is used to store and identify a users' unique session ID for the purpose of managing user session on the website. The cookie is a session cookies and is deleted when all the browser windows are closed.

Cookie	Duration	Description
IDE	1 year 24 days	Used by Google DoubleClick and stores information about how the user uses the website and any other advertisement before visiting the website. This is used to present users with ads that are relevant to them according to the user profile.
test_cookie	15 minutes	This cookie is set by doubleclick.net. The purpose of the cookie is to determine if the user's browser supports cookies.
VISITOR_INFO1_LIVE	5 months 27 days	This cookie is set by Youtube. Used to track the information of the embedded YouTube videos on a website.
yt-remote-connected-devices	never	These cookies are set via embedded youtube-videos.
yt-remote-device-id	never	These cookies are set via embedded youtube-videos.
yt.innertube::nextId	never	These cookies are set via embedded youtube-videos.
yt.innertube::requests	never	These cookies are set via embedded youtube-videos.

Cookie	Duration	Description
aelia_cs_selected_currency	1 day	No description
CONSENT	16 years 9 months 21 days 7 hours 19 minutes	No description
cookielawinfo-checkbox-functional	1 year	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-others	1 year	No description