User`s Manual - Berkeley Nucleonics Corporation
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1. SOURce AM Subsystem Amplitude Modulation Command Parameters Unit default SOURce AM DEPTh lt value gt 0 8 80 PCT SOURce AM STATe ON OFF 1 0 SOURce AM INTernal FREQuency value 400 Hz AM INT FREQuency SOURce AM INTernal FREQuency value unit UP DOWN SOURce AM INTernal FREQuency This command sets the internal amplitude modulation rate RST 400 Hz Range 400 Hz and 1000 Hz The RF carrier is modulated when you have set the signal generator s AM modulation state to ON Whenever amplitude modulation is enabled the AM on is in the display AM DEPTh SOURce AM DEPTh lt value gt SOURce AM DEPTh This command sets the amplitude modulation depth O 1 RST 0 8 Range 0 0 99 SOURce FM Subsystem Frequency Modulation Command Parameters Unit default SOURce FM DEViation lt value gt 10000 Hz SOURce FM SENSitivity lt value gt 10000 Hz V SOURce FM SOURce EXTernal LFGenerator EXT SOURce FM STATe ON OFF 1 O OFF 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 27 of 37 FM DEViation SOURce FM SENSitivity value SOURce FM SENSitivity This command sets the frequency modulation deviation This setting will be used if FM SOURce is set to LFGenerator The variable value is expressed in units of Hertz RST 10000 FM SENSitivity SOURce FM SENSitivity value SOURce2. The waveform plays during the inactive state and stops during the active polarity selection state The active state can be set high or low The gate mode works only with an external trigger source POINT Upon triggering only a single point of the sweep list is played RST NORM TRIGger TYPE GATE SOURce TRIGger TYPE GATE LOW HIGH SOURce TRIGger TYPE GATE This command selects the active state gate polarity of the gate while using the gating trigger mode The LOW and HIGH selections correspond to the low and high states of an external trigger signal For example when you select HIGH the active state occurs during the high of the trigger signal When the active state occurs the BNC MODEL 835 3 starts the waveform playback at the last played sample point then stops the playback at the next sample point when the inactive state occurs LOW The waveform playback starts when the trigger signal goes low active state and stops when the trigger signal goes high inactive state 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 31 of 37 HIGH The waveform playback starts when the trigger signal goes high active state and stops when the trigger signal goes low inactive state RST HIGH TRIGger SEQuence SOURce SOURce TRIGger SEQuence SOURce IMMediate KEY EXTernal BUS SOURce TRIGger SEQuence SOURce This command sets the trigger source IMMediate No waiting for a trigger event
3. FM SENSitivity This command sets the frequency modulation deviation per one volt peak amplitude signal input This setting will be used if FM SOURce is set to EXTernal The variable value is expressed in units of Hertz per Volt RST 10000 FM SOURce SOURce FM SOURce EXTernal LFGenerator SOURce FM SOURce This command selects the FM modulation signal source If LFGenerator is selected the device s function output has to be connected to the FM PM input at the rear panel RST EXT FM STATe SOURce FM STATe ON OFF 1 0 SOURce FM STATe This command turns the frequency modulation on or off RST OFF SOURce PM Subsystem Phase Modulation Command Parameters Unit default SOURce PM DEViation value 1 rad SOURce PM SENSitivity value 1 rad V SOURce PM SOURce EXTernal LFGenerator EXT SOURce PM STATe ON OFF 1 0 OFF PM DEViation SOURce PM SENSitivity value SOURce PM SENSitivity This command sets the phase modulation deviation This setting will be used if PM SOURce is set to LFGenerator The variable lt value gt is expressed in units of radians RST 1 PM SENSitivity SOURce FM SENSitivity value SOURce FM SENSitivity This command sets the phase modulation deviation per one volt peak amplitude signal input This setting will be used if PM SOURce is set to EXTernal The variable value is expressed in units of radians per Volt R
4. FM Subsystem Frequency Modulation SOURce PM Subsystem Phase Modulation SOURce PULM Subsystem Pulse Modulation LT RIGG Cr Subsystem iiie eso rra iene Enea es ERAN ERR nnen ve EXE STATUS SUDSVSLON irc dura inenten insane SORA EUER ARES SYSTem SUbSVStelm aussen axi r ENRYRE RARE haaren ke SYSTem COMMunicate Subsystem unsure eenen UNIT SubDSysterm saasrsererssrnnnenkenehdat sneden en Company Details exco cree hd dn Re EE EX di KERA ven sven Berkeley Nucleonics www berkeleynucleonics com BNC BNC Model 835 3 Programmer s Manual v1 21 Page 3 of 37 1 Introduction This manual provides information for remote operation of the 835 3 Signal Generators using commands sent from an external controller via Ethernet It includes the following e Ageneral description of the LAN and the bus data transfer and control functions e Ageneral description of how to establish connection to the BNC Model 835 3 via LAN e A listing of the IEEE 488 Interface Function Messages recognized by the signal generator with a description of its response e A complete listing and description of all the Standard Commands for Programmable Instruments SCPI commands that can be used to control signal generator operation with examples of command usage Ethernet Interface Connection and Setup The BNC MODEL 835 3 fully supports the IEEE 802 3 standard Most front panel functions except power on off ca
5. Range 0 255 Remarks The setting enabled by this command is not affected by signal generator preset or RST However cycling the signal generator power will reset this register to zero ESE The Standard Event Status Enable ESE query returns the value of the Standard Event Status Enable Register ESR The Standard Event Status Register ESR query returns the value of the Standard Event Status Register NOTE Reading the Standard Event Status Register clears it Remarks The Register is not affected by signal generator preset or RST However cycling the signal generator power will reset this register to zero 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 9 of 37 IDN The Identification IDN query outputs an identifying string The response will show the following information company name model number serial number firmware revision OPC The Operation Complete OPC command sets bit 0 in the Standard Event Status Register when all pending operations have finished The Operation Complete command causes the device to set the operation complete bit bit O in the Standard Event Status Register when all pending operations have been finished OPC The Operation Complete OPC query returns the ASCII character 1 in the Standard Event Status Register when all pending operations have finished This query stops any new commands from being processed until the current proc
6. a gt gt prompt when ready UNIT Subsystem Command Parameters Unit default Remark UNIT POWer W V DBM DB DBM UNIT FREQuency HZ MHZ GHZ HZ UNIT POWer UNIT POWer W V DBM DB RST DBM UNIT FREQuency UNIT FREQuency HZ MHZ GHZ RST HZ Company Details Address Berkeley Nucleonics 2955 Kerner Blvd San Rafael CA 94901 Phone 415 453 9955 Fax 415 453 9956 Email info berkeleynucleonics com web www berkeleynucleonics com 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 37 of 37
7. characters Except for common commands each keyword has a long and a short form In this manual the long form is presented with the short form in upper case and the remainder in lower case Unrecognized versions of long form or short form commands or improper syntax will generate an error 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 12 of 37 Structure of a Command Line A command line may consist of one or several commands It is terminated by an EOI together with the last data byte Several commands in a command line must be separated by a semicolon If the next command belongs to a different command system the semicolon is followed by a colon A colon at the beginning of a command marks the root node of the command tree If the successive commands belong to the same system having one or several levels in common the command line can be abbreviated To this end the second command after the semicolon starts with the level that lies below the common levels The colon following the semicolon must be omitted in this case Responses to Queries A query is defined for each setting command unless explicitly specified otherwise It is formed by adding a question mark to the associated setting command According to SCPI the responses to queries are partly subject to stricter rules than in standard IEEE 488 2 Parameters Most commands require a parameter to be specified The parameters mu
8. network computer can be established Sockets LAN can be described as an internet address that combines Internet Protocol IP with a device port number and represents a single connection between two pieces of software The Socket can be accessed using code libraries packaged with the computer operating system Two common versions of socket libraries are the Berkeley Sockets Library for UNIX systems and Winsock for Microsoft operating systems Your signal generator implements a socket Applications Programming Interface API that is compatible with Berkeley socket for UNIX systems and Winsock for Microsoft systems The signal generator is also compatible with other standard sockets APIs The signal generator can be controlled using predefined SCPI functions once the socket connection is established in your program Socket connection is available on port 18 Using and Configuring VXI 11 VISA The signal generator supports the LAN interface protocol described in the VXI 11 standard VXI 11 is an instrument control protocol based on Open Network Computing Remote Procedure Call ONC RPC interfaces running over TCP IP A range of standard software such as NI VISA or Agilent IO Config is available to setup the computer signal generator interface for the VXI 11 protocol Please refer to the applicable software user manual and documentation for information on running the program and configuring the VXI 11 interface The program is used to configure
9. occurrs KEY This choice enables manual triggering by pressing the front panel RFon off EXTernal This choice enables the triggering of a sweep event by an externally applied signal at the MOD IN connector BUS This choice enables triggering over the LAN using the TRG or GET commands RST IMM TRIGger SEQuence DELay SOURce TRIGger SEQuence DELay lt value gt SOURce TRIGger SEQuence DELay This command sets the amount of time to delay the BNC MODEL 835 3 response to an external trigger The delay is a path time delay between when the 835 3 receives the trigger and when it responds to the trigger The delay does not occur until you turn it on You can set the delay value either before or after turning it on TRIGger SEQuence SLOPe SOURce TRIGger SEQuence SLOPe POSitive NEGative SOURce TRIGger SEQuence EXTernal SLOPe This command sets the polarity for an external trigger signal while using the continuous single triggering mode The POSitive and NEGative selections correspond to the high positive and low negative states of the external trigger signal For example when you select POSitive the waveform responds plays during the high state of the trigger signal When the BNC MODEL 835 3 receives multiple trigger occurrences when only one is required the signal generator uses the first trigger and ignores the rest RST POS TRIGGer RETRigger SOURce RETRigger ON OFF IMMediate SOURce RETRigger
10. the LAN client Once the computer is configured for a LAN client you can use the VXI 11 protocol and the VISA library to send SCPI commands to the signal generator over the LAN interface Example programs are available on request under supporti Berkeley Nucleonics com VISA is an IO library used to develop IO applications and instrument drivers that comply with industry standards It is recommended that the VISA library be used for programming the signal generator The NI VISA and Agilent VISA libraries are similar implementations of VISA and have the same commands syntax and functions Using SCPI for BNC MODEL 835 3 The Standard Commands for Programmable Instrumentation SCPI provides a uniform and consistent language to control programmable test and measurement devices in instrumentation systems The SCPI Standard is built on the foundation of IEEE 488 2 Standard Codes and Formats It requires conformance to IEEE 488 2 but is pure software standard SCPI syntax is ASCII text and therefore can be attached to any computer test language such as BASIC C or C It can also be used with Test Application Environments such as LabWindows CVI LabVIEW or Matlab SCPI is hardware independent SCPI strings can be sent over any instrument interface It works equally well over GPIB RS 232 VXIbus or LAN networks Please see the chapter 4 for detailed description of supported SCPI commands Using Telnet LAN Telnet provides a means o
11. BNC BNC Model 835 3 Programmer s Manual Berkeley Nucleonics BNC Model 835 3 www berkeleynucleonics com Programmer s Manual v1 21 Page 1 of 37 BNC Version 1 21 January 2010 Copyright This manual is copyright by Berkeley Nucleonics and all rights are reserved No portion of this document may be reproduced copied transmitted transcribed stored is a retrieval system or translated in any form or by any means Electronic mechanical magnetic optical chemical manual or otherwise without written permission of Berkeley Nucleonics Berkeley Nucleonics and the Berkeley Nucleonics logo are internationally registered trademarks of Berkeley Nucleonics Berkeley Nucleonics acknowledges the following product names as trademarks of their respective owners Microsoft Windows LabVIEW MATLAB Disclaimer Berkeley Nucleonics makes no representation or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability for any particular purpose Berkeley Nucleonics reserves the right to revise this publication and to make changes from time to time in the content thereof without obligation of Berkeley Nucleonics to notify any person of such revision or change Berkeley Nucleonics BNC Model 835 3 www berkeleynucleonics com Programmer s Manual v1 21 Page 2 of 37 Contents 1 Introd CtOM pet L Ethernet Interface Connection and Setup 2 Program
12. ISPlay WINDow TEST ON OFF 1 0 DISPlay WINDow TEXT STATe ON OFF 1 0 DISPlay WINDow TEXT STATe Turns on off the parameter display of the BNC MODEL 835 3 front panel data display DISPlay REMote ON OFF 1 0 DISPlay REMote ON OFF 1 0 DISPlay REMote Turns on off the display update of the BNC MODEL 835 3 front panel data display INITiate Subsystem The INITiate subsystem controls the state of the BNC MODEL 835 3 trigger system The subsystem commands and parameters are described below The INITiate commands along with the ABORt and TRIGger commands comprise the Trigger Group of commands Command Parameters Unit Remark default INITiate IMMediate ON INITiate CONTinuous ON OFF 1 0 OFF INITiate IMMediate Sets BNC MODEL 835 3 trigger to the armed state INITiate CONTinuous ON OFF 1 O 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 18 of 37 Continuously rearms the BNC MODEL 835 3 trigger system after completion of a triggered sweep OUTPut Subsystem Command Parameters Unit Remark default OUTPut STATe ON OFF 1 0 OFF OUTPut BLANking ON OFF 1 0 OFF FW2 4 STATe ON OFF 1 0 OUTPut STATe ON OFF 1 0 Turns BNC MODEL 835 3 RF output power on off BLANking STATe ON OFF 1 0 OUTPut BLANking STATe ON OFF 1 O OUTPut BLANking STATe ON causes the RF output to be turned off blanke
13. LAN DNS OVERride ON OFF 1 0 SYSTem COMMunicate LAN DNS OVERride This command enables you to override the DNS server that is returned by the DHCP server The LAN configuration type must be set to Auto or DHCP to use this feature The query returns the current setting not the saved setting LAN DNS SERVer not implemented SYSTem COMMunicate LAN DNS SERVer lt ipstring gt SYSTem COMMunicate LAN DNS SERVer This command defines the IP address of the signal generator DNS server This entry defines the DNS server for the signal generator LAN connection The query returns the current setting not the saved setting LAN GATeway SYSTem COMMunicate LAN GATeway lt ipstring gt SYSTem COMMunicate LAN GATeway This command sets the gateway for local area network LAN access to the signal generator from outside the current sub network The query returns the current setting not the saved setting LAN HOSTname SYSTem COMMunicate LAN HOSTname lt string gt SYSTem COMMunicate LAN HOSTname This command sets the signal generator s local area network LAN connection hostname Maximum 29 characters are allowed The query returns the current setting not the saved setting LAN IDENtify not implemented SYSTem COMMunicate LAN IDENtify ON OFF 1 0 This command controls the LAN identify feature ON 1 The command enables device identification by displaying the full screen message Identify IP Address gt on the signal g
14. LS command Event registers are read only Enable Register The enable register specifies the bits in the event register that can produce a summary bit The BNC MODEL 835 3 logically ANDs corresponding bits in the event and enable registers and ORs all the resulting bits to obtain a summary bit Summary bits are recorded in the Summary Status Byte Enable registers are read write Querying an 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 15 of 37 enable register does not affect it The command STATus PRESet sets the Operation Status Enable register and the Questionable Status Enable register to all O s Status Group Reporting The state of certain BNC MODEL 835 3 hardware and operational events and conditions can be determined by programming the status system Three lower status groups provide status information to the Summary Status Byte group The Summary Status Byte group is used to determine the general nature of an event or condition and the other status groups are used to determine the specific nature of the event or condition Summary Status Byte Group The Summary Status Byte group consisting of the Summary Status Byte Enable register and the Summary Status Byte is used to determine the general nature of a 835 3 event or condition The bits in the Summary Status Byte provide the following Operation Status Group The Operation Status group consisting of the Operation Condition register t
15. MANual This choice enables you to select a single sweep point The selected point controls the frequency and or amplitude according to the sweep type Refer to LIST MANual command for selecting a sweep point RST AUTO LIST POWer SOURce LIST POWer lt value gt lt value gt SOURce LIST POWer This command sets the amplitude for the current list sweep points LIST POWer POINts SOURce LIST POWer POINts This command queries the number of power points in the current list sweep file LIST COUNt SOURce LIST COUNt lt value gt SOURce LIST COUNt This command sets the number of consecutive times the list is executed on each sweep start The variable lt value gt is 1 to 65635 or INFinity SOURce LFOutput Subsystem Command Parameters Unit default SOURce LFOutput AMPLitude lt value gt 1V SOURce LFOutput FREQuency lt value gt 400 Hz SOURce LFOutput STATe ONJOFF 1 0 OFF SOURce LFOutput SHAPe SINE TRIangle SQUare SINE SOURce LFOutput SOURce LFGenerator PULM TRIGger LFG 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 24 of 37 LFOutput AMPLitude SOURce LFOutput AMPLitude lt value gt SOURce LFOutput AMPLitude This command sets the low frequency generator amplitude This setting does only take effect if LFOutput SOURce is set to LFGenerator and LFOutput SHAPe is either set to SINE or TRIangle Using any other settin
16. N DESCription string SYSTem COMMunicate LAN DESCription This command defines the instrument s web description The query returns the current saved setting LAN DHCP TIMeout not implemented SYSTem COMMunicate LAN DHCP TIMeout 30 60 90 120sec SYSTem COMMunicate LAN DHCP TIMeout 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 35 of 37 This command enables the user to change the maximum length of time that the instrument will spend trying to acquire an IP address using DHCP If the LAN Config Type is set to Auto then the Auto IP protocol will be used as a fall back when time out does occur The DHCP timeout value is stored in the same non volatile ram as the other LAN configurations The query returns the current setting not the saved setting Default 30 Seconds LAN DOMain not implemented SYSTem COMMunicate LAN DOMain string SYSTem COMMunicate LAN DOMain This command defines the domain name of the signal generator s DNS server This entry defines the DNS server for the signal generator LAN connection The query returns the current setting not the saved setting LAN DNS DYNamic not implemented SYSTem COMMunicate LAN DNS DYNamic ON OFF 1 O SYSTem COMMunicate LAN DNS DYNamic This command turns dynamic Domain Name System DNS on off The query returns the current setting not the saved setting LAN DNS OVERride not implemented SYSTem COMMunicate
17. REset Firmware 2 21 STATus QUEStionable EVENt Firmware 2 21 STATus QUEStionable CONDition Firmware 2 21 STATus QUEStionable ENABle value Firmware 2 21 STATus QUEStionable PTR value Firmware 2 21 STATus QUEStionable NTR value Firmware 2 21 OPERation STATus OPERation EVENt This query returns the contents of the operation status event register and clears it OPERation CONDition STATus OPERation CONDition This query returns the contents of the operation status condition register OPERation ENABle STATus OPERation ENABle This command sets the enable mask of the operation status event register OPERation PTR STATus OPERation PTR This command sets the positive transition filter of the operation status event register OPERation NTR STATus OPERation NTR This command sets the negative transition filter of the operation status event register PRESet STATus PRESet Disables all status events clears all negative transition filters and sets all positive transition filters 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 33 of 37 QUEStionable STATus QUEStionable EVENt This query returns the contents of the questionable status event register and clears it QUEStionable CONDition STATus QUEStionable CONDition This query returns the contents of the questionable status condition register QUEStionable ENABle STATus QUEStionable ENABle Thi
18. ST 1 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 28 of 37 PM SOURce SOURce PM SOURce EXTernal LFGenerator SOURce PM SOURce This command selects the PM modulation signal source If LFGenerator is selected the device s function output has to be connected to the FM PM input at the rear panel RST EXT PM STATe SOURce PM STATe ONJ OFF 1 O SOURce PM STATe This command turns the phase modulation on or off RST OFF SOURce PULM Subsystem Pulse Modulation This additional functionality provides pulse modulation of the RF output signal delivered to the load by an internal or external modulation signal The INTernal selection accesses the internally generated modulation input while EXTernal selects the external pulse rear panel connector input Command Parameters Unit default SOURce PULM POLarity NORMal INVerted NORMal SOURce PULM INTernal FREQuency frequency Hz SOURce PULM INTernal PERiod period S SOURce PULM INTernal PWIDth WIDTh num S SOURce PULM SOURce INTernal EXTernal INT SOURce PULM STATe ON OFF 1 0 OFF SOURce PULM MODE FIXed LIST FIXed PULM POLarity SOURce PULM POLarity NORMal INVerted SOURce PULM POLarity This command selects the polarity of the pulse modulation regardless if the internal or external modulation source is used RST Normal PULM INTernal FREQuency SOURce PULM IN
19. Ternal FREQuency frequency SOURce PULM INTernal FREQuency This command sets the pulse rate for the internally generated square wave using the variable frequency RST 400 Hz Range INT 0 1 Hz 100 kHz EXT 0 1 Hz 10 MHz PULM INTernal PERiod SOURce PULM INTernal PERiod period SOURce PULM INTernal PERiod This command sets the pulse period for the internally generated pulse modulation using the variables lt va ue gt 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 29 of 37 If the entered value for the pulse period is equal to or less than the value for the pulse width the pulse width changes to a value that is less than the pulse period RST 2 5 ms Range 200 ns 10s PULM INTernal PWIDth WIDTh SOURce PULM INTernal PWIDth WIDTh num SOURce PULM INTernal PWIDth WIDTh This command sets the pulse width for the internally generated pulse signal This command sets the pulse width for the internally generated pulse modulation using the variable num If the entered value for the pulse width is equal to or greater than the value for the pulse period the pulse width changes to a value that is less than the pulse period RST 1 25 ms Range 50 nS to PERiod PULM SOURce SOURce PULM SOURce INTernal EXTernal SOURce PULM SOURce RST INT PULM STATe SOURce PULM STATe ON OFF 1 0 SOURce PULM STATe This command enables or disables pul
20. This command enables or disables the ARB retriggering mode the retrigger mode controls how the retriggering function performs while a waveform is playing ON 1 This choice specifies that if a trigger occurs while a waveform is playing the waveform will retrigger at the end of the current waveform sequence and play once more OFF 0 This choice specifies that if a trigger occurs while a waveform is playing the trigger will be ignored IMMediate This choice specifies that if a trigger occurs while a waveform is playing the waveform will reset and replay from the start immediately upon receiving a trigger RST ON TRIGger ECOunt SOURce TRIGger ECOunt lt value gt 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 32 of 37 This command sets a modulo on consecutive trigger events Setting the value to N means that only every Nth trigger event will be considered Setting it to one means will use every trigger event that does not occur during a running sweep RST 1 Range 1 to 255 STATus Subsystem This subsystem controls the status reporting structures Command Parameters Unit Remark default STATus OPERation EVENt Firmware 2 21 STATus OPERation CONDition Firmware 2 21 STATus OPERation ENABle lt value gt Firmware 2 21 STATus OPERation PTR lt value gt Firmware 2 21 STATus OPERation NTR lt value gt Firmware 2 21 STATus P
21. ard refers to this structure as the Command Tree The command keywords that correspond to the major instrument control functions are located at the top of the command tree The command keywords for the BNC MODEL 835 3 SCPI command set are shown below ABORt DIAGnostic DISPlay INITiate OUTput SOURce STATus SYSTem TRIGger UNIT All BNC MODEL 835 3 SCPI commands except the ABORt command have one or more subcommands keywords associated with them to further define the instrument function to be controlled The subcommand keywords may also have one or more associated subcommands keywords Each subcommand level adds another layer to the command tree The command keyword and its associated subcommand keywords form a portion of the command tree called a command subsystem Status System Programming The BNC MODEL 835 3 implements the status byte register the Service Request Enable Register the Standard Event Status Register and the Standard Event Status Enable Register 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 14 of 37 The BNC MODEL 835 3 status system consists of the following SCPI defined status reporting structures e he Instrument Summary Status Byte e The Standard Event Status Group e The Operation Status Group e The Questionable Status Group The following paragraphs describe the registers that make up a status group and explain the status information that each st
22. ator for the number of frequency points in the current list sweep file LIST FREQuency SOURce LIST FREQuency lt value gt lt value gt SOURce LIST FREQuency This command sets the frequency values for the current list sweep points The maximum number of list sweep points is 3 501 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 23 of 37 The variable value is expressed in units of Hertz The setting enabled by this command is not affected by signal generator power on preset or RST Range Please refer to the Data Sheet LIST MANual SOURce LIST MANual value UP DOWN SOURce LIST MANual This command sets a list or step sweep point as the current sweep point controlling the frequency and power output If list or step mode is controlling frequency or power or both then the indexed point in the respective list s will be used Entering a value with this command will have no effect unless MANual is the selected mode Refer to LIST MODE command for setting the proper mode If the point selected is beyond the length of the longest enabled list then the point will be set to the maximum possible point and an error will be generated Range 1 3 501 LIST MODE SOURce LIST MODE AUTO MANual SOURce LIST MODE This command sets the operating mode for the current list or step sweep AUTO This choice enables the selected sweep type to perform a sweep of all points
23. atus group provides Status Registers In general a status group consists of a condition register a transition filter an event register and an enable register Each component is briefly described in the following paragraphs Condition Register The condition register is continuously updated to reflect the current status of the BNC MODEL 835 3 There is no latching or buffering for this register it is updated in real time Reading the contents of a condition register does not change its contents Transition Filter The transition filter is a special register that specifies which types of bit state changes in the condition register will set corresponding bits in the event register Negative transition filters NTR are used to detect condition changes from True 1 to False 0 positive transition filters PTR are used to detect condition changes from False 0 to True 1 Setting both positive and negative filters True allows an event to be reported anytime the condition changes Transition filters are read write Transition filters are unaffected by queries or CLS clear status and RST commands The command STATus PRESet sets all negative transition filters to all O s and sets all positive transition filters to all 1 s Event Register The event register latches transition events from the condition register as specified by the transition filter Bits in the event register are latched and once set they remain set until cleared by a query or a C
24. d during frequency changes OFF leaves RF output turned on unblanked SOURce FREQuency Subsystem Command Parameters Unit default SOURce FREQuency FIXed CW fmin to fmax Hz SOURce FREQuency MODE FIX CW SWEep LIST FIXed SOURce FREQuency STARt fmin to fmax Hz SOURce FREQuency STOP fmin to fmax Hz SOURce FREQuency STEP LINear 0 to f max fmin Hz SOURce FREQuency STEP LOGarithmic 0 to 255 999999999 FREQuency CW SOURce FREQuency CW value unit SOURce FREQuency CW This command sets the signal generator output frequency for the CW frequency mode RST 100 MHz Range Please refer to the Data Sheet FREQuency MODE SOURce FREQuency MODE FIX CW SWEep LIST SOURce FREQuency MODE This command sets the frequency mode of the signal generator to CW or swept FIX CW Stops a frequency sweep SWEep or LIST This choice selects the swept frequency mode If sweep triggering is set to immediate along with continuous sweep mode executing the command starts the LIST or SWEep frequency sweep In SWEep mode frequency will be determined by programmed values for the STARt and STOP FREQuency subsystem commands In LIST 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 19 of 37 mode frequency is determined by programmed values for LIST FREQuency FREQuency STARt SOURce FREQuency STARt value unit SOURce FREQu
25. e network ID but different station IDs e Default Gateway A TCP IP network can have a gateway to communicate beyond the LAN identified by the network ID A gateway is a computer or electronic device that is connected to two different networks and can move TCP IP data from one network to the other A single LAN that is not connected to other LANs requires a default gateway setting of 0 0 0 0 If you have a gateway then the default gateway would be set to the appropriate value of your gateway e MAC Address A MAC address is a unique 48 bit value that identifies a network interface card to the rest of the network Every network card has a unique MAC address permanently stored into its memory Interface between the signal generator and other devices on the network is via a category five CAT 5 interface cable connected to a network This cable uses four twisted pairs of copper insulators terminated into an RJ45 connector CAT 5 cabling is capable of supporting frequencies up to 100 MHz and data transfer speeds up to 1 Gbps which accommodates 1000Base T 100Base T and 10Base T networks The instrument can be remotely programmed using the VXI 11 protocol A VISA I O library like NI VISA is used on the server side to facilitate the communications A VISA installation on the controller is a prerequisite for remote control over LAN interface VISA is a standardized software interface library providing input and output functions to communicate wit
26. ency STARt This command sets the first frequency point in a step sweep RST The preset value is 1 GHz Please refer to the Data Sheet Range Please refer to the Data Sheet FREQuency STOP SOURce FREQuency STOP value unit SOURce FREQuency STOP This command sets the last frequency point in a step sweep RST The preset value is 2 GHz Range Please refer to the Data Sheet SOURce FREQuency STEP SOURce FREQuency STEP LINear value unit This command sets the step size for a linear step sweep SOURce FREQuency STEP LOGarithmic SOURce FREQuency STEP LOGarithmic value This command sets the step size for a logarithmic step sweep SOURce PHASe Subsystem Command Parameters Unit Remark default SOURce PHASe REFerence radians FW2 4 SOURce PHASe ADJust value radians PHASe REFerence SOURce PHASe REFerence This command sets the current output phase as a zero reference Subsequent phase adjustments are set relative to the new reference PHASe ADJust SOURce PHASe ADJust value unit SOURce PHASe ADJust This command adjusts the phase of the signal The query will only return values in radians RST The preset value is O SOURce POWer Subsystem Command Parameters Unit default SOURce POWer LEVel IMMediate AMPLit value dBm ude SOURce POWer MODE FIXed LIST SWE FIXed 835 3 Berkeley Nucleonics Program
27. enerator s front panel the LAN Status indicator will also show IDENTIFY For more information refer to the Programming Guide 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 36 of 37 OFF 0 This command disables device identification by clearing the message on the signal generator s front panel and returning the LAN Status indicator to display the current network state For more information refer to the Programming Guide LAN IP SYSTem COMMunicate LAN IP lt ipstring gt SYSTem COMMunicate LAN IP This command sets the signal generator s local area network LAN internet protocol IP address for your IP network connection LAN KEEP TIMeout not implemented SYSTem COMMunicate LAN KEEP TIMeout value SYSTem COMMunicate LAN KEEP TIMeout This command sets the length of time for the TCP Keep Alive setting Range 0 sec to 3600 sec LAN RESTart SYSTem COMMunicate LAN RESTart This command restarts the network to enable changes that have been made to the LAN setup LAN SUBNet SYSTem COMMunicate LAN SUBNet lt ipstring gt SYSTem COMMunicate LAN SUBNet This command sets the signal generator s local area network LAN subnet mask address for your internet protocol IP network connection SOCKet ECHO SYSTem COMMunicate SOCKet ECHO This command turns the echo from the 835 3 controller on or off Echo is typically turned on only for a telnet session The 835 3 returns
28. ers Unit default SOURce ROSCillator EXTernal FREQuency val 100 MHz SOURce ROSCillator SOURce INTernal EX INT Ternal REFerence EXTernal FREQuency val SOURce ROSCillator EXTernal FREQuency val This command conveys the expected reference frequency value of an externally applied reference the signal generator The variable val is expressed in units of MHz RST 10 MHz Range 1 to 100 MHz in 1 MHz steps SOURCe SOURce ROSCillator SOURce INT EXT This command selects either an internal or external reference for the waveform clock RST INT SOURce LIST Subsystem Command Parameters Unit Remark default SOURce LIST DIRection UP DOWN RANDom UP SOURce LIST DWELI lt value gt S SOURce LIST DELay lt value gt S SOURce LIST DELay AUTO ON OFF 1 0 ON SOURce LIST FREQuency POINts SOURce LIST FREQuency lt value gt lt value gt Hz 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 22 of 37 SOURce LIST MANual value UP DOWN FW2 4 SOURce LIST MODE AUTO MANual FW2 4 SOURce LIST POWer value 1 value dBm SOURce LIST POWer POINts SOURce LIST COUNt value INFinity 1 LIST DIRection SOURce LIST DIRection UPIDOWN RANDom SOURce LIST DIRection This command sets the direction of a list or step sweep UP This choice enables a sweep in an ascending order e fir
29. essing is complete This command blocks the communication until a operations are complete i e the timeout setting should be longer than the longest sweep OPT The options OPT query returns a comma separated list of all of the instrument options currently installed on the signal generator PSC ON OFF 1 0 The Power On Status Clear PSC command controls the automatic power on clearing of the Service Request Enable Register the Standard Event Status Enable Register and device specific event enable registers ON 1 This choice enables the power on clearing of the listed registers OFF 0 This choice disables the clearing of the listed registers and they retain their status when a power on condition occurs PSC The Power On Status Clear PSC query returns the flag setting as enabled by the PSC command RCL reg The Recall RCL command recalls the state from the specified memory register reg RST affected The Reset RST command resets most signal generator functions to factory defined conditions Remarks Each command shows the RST default value if the setting is affected SAV reg The Save SAV command saves signal generator settings to the specified memory register reg Remarks The save function does not save all signal generator settings Refer to the User s Guide for more information on the save function SRE data The Service Request Enable SRE command sets the value of the Ser
30. f communicating with the signal generator over the LAN The Telnet client run on a LAN connected computer will create a login session on the signal generator A connection established between computer and signal generator generates a user interface display screen with gt prompts on the command line Using the Telnet protocol to send commands to the signal generator is similar to communicating with the signal generator over LAN You establish a connection with the signal generator and then send or receive information using predefined commands Communication is interactive one command at a time The telnet service is available on port 18 Once a telnet session to the device is established the echo can be enabled by typing SYST COMM SOCK ECHO ON Following this command a prompt gt gt should become visible Internet Browser The BNC MODEL 835 3 hosts a web server firmware 2 1 upwards that allows you to remotely perform basic control of the device platform independent from any current web browsers To connect to your 835 3 via a web browser the device must exist within the LAN and the dynamic IP must be known It can be accessed by typing the IP into the browser s URL window PARAMETER DEFAULT Host Name BNC MODEL 835 3 IP Address DHCP acquired If DHCP absent assigned via Auto IP 169 254 5 5 Subnet Mask DHCP acquired If DHCP absent assigned via Auto IP Gateway 0 0 0 0 DNS Server 0 0 0 0 Listening Por
31. g the output amplitude is fixed 2 5 V The variable lt value gt is expressed in units of Volt Range 0 2 5 RST 1 LFOutput FREQuency SOURce LFOutput FREQuency lt value gt SOURce LFOutput FREQuency This command sets the low frequency generator frequency This setting does only take effect if LFOutput SOURce is set to LFGenerator The variable value is expressed in units of Hertz Range 10 5000000 RST 400 LFOutput STATe SOURce LFOutput STATe ON OFF 1 0 SOURce LFOutput STATe This command sets the function output low frequency generator state RST OFF LFOutput SHAPe SOURce LFOutput SHAPe SINE TRIangle SQUare SOURce LFOutput SHAPe This command sets the low frequency generator waveform This setting does only take effect if LFOutput SOURce is set to LFGenerator SINE Sine wave output amplitude is selectable by the LFOutput AMPLitude setting TRIangle Triangle wave output amplitude is selectable by the LFOutput AMPLitude setting SQUare Square wave output amplitude is fixed 2 5 V RST SINE LFOutput SOURce SOURce LFOutput SOURce LFGenerator PULM TRIGger SOURce LFOutput SOURce This command sets the low frequency generator waveform This setting does only take effect if LFOutput SOURce is set to LFGenerator LFGenerator This selects the low frequency generator as the function output signal PULM This selects the pulse modulation video out as the function output signa
32. gger system programming is also provided Introduction Standard Commands for Programmable Instruments SCPI is the new instrument command language for controlling instruments that goes beyond IEEE 488 2 to address a wide variety of instrument functions in a standard manner SCPI promotes consistency from the remote programming standpoint between instruments of the same class and between instruments with the same functional capability For a given measurement function such as frequency or voltage SCPI defines the specific command set that is available for that function Thus two oscilloscopes made by different manufacturers could be used to make frequency measurements in the same way It is also possible for a SCPI counter to make a frequency measurement using the same commands as an oscilloscope SCPI commands are easy to learn self explanatory and account for both novice and expert programmer s usage Once familiar with the organization and structure 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 11 of 37 of SCPI considerable efficiency gains can be achieved during control program development independent of the control program language selected A key to consistent programming is the reduction of multiple ways to control similar instrument functions The philosophy of SCPI is for the same instrument functions to be controlled by the same SCPI commands To simplify learning SCPI uses industry s
33. h instruments For more information about VISA refer to the VISA library supplier s documentation The SCPI command set listed in the BNC MODEL 835 3 programmer s manual applies to LAN programming as well Only the IP address or the device name is required for link setup The IP address device name is part of the visa resource string used by the programs for identification and control of the instrument The visa resource string has the form TCPIP ipaddr instO INSTR ipaddr has to be replaced by the IP address or the computer name of the instrument For instance if the instrument has the IP address 192 168 1 50 TCPIP 192 168 1 50 instO INSTR is the valid resource name Specification of instO in the resource name is optional In this example also TCPIP 192 168 1 50 INSTR is therefore a valid resource name TCPIP designates the network protocol used and INSTR indicates that the VXI 11 protocol is used If several instruments are connected to the network each instrument has its own IP address and associated resource name The controller identifies these instruments by means of the resource name 2 Programming the BNC MODEL 835 3 The BNC Model 835 3 signal generator can be remotely programmed via a 10 100 1000Base T LAN interface and LAN connected computer using one of several LAN interface protocols The LAN allows instruments to be connected together and controlled by a LAN based computer LAN and its associated interface o
34. he Operation Positive Transition register the Operation Negative Transition register the Operation Event register and the Operation Event Enable register Standard Event Status Group The Standard Event Status group consisting of the Standard Event Status register an Event register and the Standard Event Status Enable register is used to determine the specific event that set bit 5 of the Summary Status Byte The bits in the Standard Event Status register provide the following Bit Description 0 Set to indicate that all pending 835 3 operations were completed following execution of the OPC command 1 Request control 2 Set to indicate that a query error has occurred Query errors have SCPI error codes from 499 to 400 3 Set to indicate that a device dependent error has occurred Device dependent errors have SCPI error codes from 399 to 300 and 1 to 32767 4 Set to indicate that an execution error has occurred Execution errors have SCPI error codes from 299 to 200 5 Set to indicate that a command error has occurred Command errors have SCPI error codes from 199 to 100 6 User request 7 Power on Standard Event Status Enable register ESE commands 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 16 of 37 Operation Status Group The Operation Status group consisting of the Operation Condition register the Operation Positive Transition register the Operation Negative Transitio
35. l TRIGger This selects the trigger as the function output signal RST LFG SOURce SWEep Subsystem Command Parameters Unit default 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 25 of 37 SOURce SWEep DIRection UP DOWN RANDom UP SOURce SWEep POINts 2 to 3855 3855 SOURce SWEep DWELI value S SOURce SWEep DELay value S SOURce SWEep DELay AUTO ON OFF 1 0 ON SOURce SWEep SPACing LINear LOGarithmic SOURce FREQuency MODE CW SWEep LIST SOURce FREQuency STARt fmin to fmax Hz SOURce FREQuency STOP fmin to fmax Hz SOURce POWer MODE CW LIST SWEep SOURce POWer STARt value dBm SOURce POWer STOP value dBm DIRection UP DOWN RANDom SOURce SWEep DIRection UPIDOWN RANDom SWEep POINts SOURce SWEep POINts value SOURce SWEep POINts This command defines the number of step sweep points RST 101 Range 2 3501 SWEep DWELI SOURce SWEep DWELI lt value gt SOURce SWEep DWELI This command sets the dwell time for the current step sweep points Dwell time is used when IMMediate is the trigger source The dwell time is the amount of time the sweep is guaranteed to pause after setting the frequency and or power for the current point The setting enabled by this command is not affected by signal generator power on preset or RST The variable value is expressed in uni
36. leonics com Page 30 of 37 e GATE trigger level starts stops sweep 2 Setting the waveform s response to triggers CONTinuous reapeatedly accepts trigger events SINGIe uses only one trigger event 3 Selecting the trigger source which determines how the BNC MODEL 835 3 receives its trigger signal internally or externally The GATE choice requires an external trigger 3 Setting the trigger polarity when using an external source Command Parameters Unit default SOURce TRIGger SEQuence TYPE NORMal GATE POINT SOURce TRIGger SEQuence TYPE GATE LOW HIGH HIGH SOURce TRIGger SEQuence SOURce IMMediate KEY EXT BUS IMM SOURce TRIGger SEQuence DELay value S SOURce TRIGger SEQuence SLOPe POSitive NEGative POS SOURce RETRigger ON OFF IMMediate Not impleme nted SOURce TRIGger SEQuence ECOunt value 1 TRIGger TYPE SOURce TRIGger TYPE NORMal GATE POINT SOURce TRIGger TYPE This command sets the trigger type that controls the waveform s playback The following list describes the trigger type command choices NORMal Upon triggering the waveform sequence plays according to settlings defined by INITiate CONTinuous only once or repeatedly GATE An external trigger signal repeatedly starts and stops the waveform s playback The time duration for playback depends on the duty period of the trigger signal and the gate polarity selection
37. mer s Manual v1 0 www Berkeley Nucleonics com Page 20 of 37 ep SOURce POWer STARt value dBm SOURce POWer STOP value dBm SOURce POWer ALC ON OFF 1 0 ON SOURce POWer ALC HOLD ON OFF 1 0 OFF SOURce POWer ATTenuation value dB FW2 219 SOURce POWer ATTenuation AUTO ON OFF 1 0 ON FW2 219 SOURce POWer ATTenuation LIST FW2 219 LEVel IMMediate AMPLitude SOURce POWer LEVel IMMediate AMPLitude value unit SOURce POWer LEVel IMMediate AMPLitude This command sets the RF output power MODE SOURce POWer MODE CW LIST SWEep SOURce POWer MODE This command sets the signal generator power mode to fixed or swept FIX This choice stops a power sweep allowing the signal generator to operate at a fixed power level Refer to LEVel IMMediate AMPLitude command for setting the output power level LIST or SWEep This choice selects the swept power mode If sweep triggering is set to immediate along with continuous sweep mode executing the command starts the LIST or STEP power sweep STARt SOURce POWer STARt lt value gt lt unit gt SOURce POWer STARt This command sets the first amplitude point in a step sweep Range STOP SOURce POWer STOP lt value gt lt unit gt SOURce POWer STOP This command sets the last amplitude point in a step sweep Range ALC SOURce POWer ALC ON OFF 1 0 SOURce POWer ALC This c
38. meters Unit default SYSTem COMMunicate LAN CONFig DHCP MANual AUTO DHCP SYSTem COMMunicate LAN DEFaults SYSTem COMMunicate LAN DHCP TIMeout 30 sec SYSTem COMMunicate LAN DOMain string SYSTem COMMunicate LAN DNS DYNamic ON OFF 1 0 SYSTem COMMunicate LAN DNS OVERride ON OFF 1 0 SYSTem COMMunicate LAN DNS SERVer lt ipstring gt SYSTem COMMunicate LAN GATeway lt ipstring gt 0 0 0 0 SYSTem COMMunicate LAN HOSTname string SYSTem COMMunicate LAN IDENtify ON OFF 1 0 SYSTem COMMunicate LAN IP ipstring SYSTem COMMunicate LAN KEEP TIMeout value SYSTem COMMunicate LAN RESTart SYSTem COMMunicate LAN SUBNet lt ipstring gt 255 255 2 55 0 SYSTem COMMunicate SOCKet n ECHO ONJOFF 1 0 OFF LAN CONFig SYSTem COMMunicate LAN CONFig DHCP MANual AUTO SYSTem COMMunicate LAN CONFig This command sets the signal generator s internet protocol IP address MANual The user assigns an IP address to the signal generator DHCP The network assigns an IP address to the signal generator If DHCP fails manual configuration will be used AUTO The network assigns an IP address to the signal generator with a fallback to Auto IP if DHCP fails If both DHCP and Auto IP fail manual configuration will be used LAN DEFaults SYSTem COMMunicate LAN DEFaults This command restores the instrument s LAN settings to their factory default values LAN DESCription not implemented SYSTem COMMunicate LA
39. ming the BNC MODEL 835 3 nonnen eneen en Using Sockets LAN ois rd nta tne ert VIR En REESE REA nt Using and Configuring VXI 11 VISA nnee nen Using SCPI for BNC MODEL 835 3 essen Using Telnet EAN esser etra uo ExR E oaa 3 REY ARWR EVER E M E aie Internet BrOWs r iis iesu ska aaa a agna wa ERE renden verde 3 IEEE 488 Interface Commands eese nn IEEE Mandated Commands essen nna an 4 SCPI Commands teat ska va Resava cs aca tad via dda ra RE RE a aait INCFOGUCTION e SCPI Command FY POS isis iuh nh EER ERR RA RERERR ned MER dd SCPI Command Syht ax iii eese ku paupe RENE RNEER EYES Hierarchical Command Structure esses Status System Programming eese nnnn SCPI Command Description nnn ennen enr enen enen enen SABORE Subsystem sis disse oir a ERR AREE ER ERE tka venen ni rete DISPlay SubsyStem s enda en ne ee o ER REPARARE sanar an ERA INITiate Subsystem eese sese ninh TEEN EIES SOURce FREQuency Subsystem eese nnn SOURce PHASe Subsystem cesses essen heh SOURce POWer Subsystem esses LEVel IMMediate AMPLitude nennen ennen SOURce ROSCillator Subsystem esee nnns SOURCE LIST Subsystem eoessesseese enean nnn nana SOURce LFOutput Subsystem sess SOURce SWEep Subsystem esses eene SOURce AM Subsystem Amplitude Modulation SOURce
40. n be remotely controlled via a network server and an Ethernet connection The BNC MODEL 835 3 software supports the TCP IP network protocol Ethernet uses a bus or star topology where all of the interfacing devices are connected to a central cable called the bus or are connected to a hub Ethernet uses the CSMA CD access method to handle simultaneous transmissions over the bus CSMA CD stands for Carrier Sense Multiple Access Collision Detection This standard enables network devices to detect simultaneous data channel usage called a collision and provides for a contention protocol When a network device detects a collision the CSMA CD standard dictates that the data will be retransmitted after waiting a random amount of time If a second collision is detected the data is again retransmitted after waiting twice as long This is known as exponential back off The TCP IP setup requires the following e IP Address Every computer electronic device in a TCP IP network requires an IP address An IP address has four numbers each between 0 and 255 separated by periods For example 192 168 1 50 is a valid IP address e Subnet Mask The subnet mask distinguishes the portion of the IP address that is the network ID from the portion that is the station ID The subnet mask 255 255 0 0 when applied to the IP address given above would identify the network ID as 192 168 and the station ID as 1 50 All stations in the same local area network should have the sam
41. n register the Operation Event register and the Operation Event Enable register is used to determine the specific condition that set bit 7 in the Summary Status Byte The bits in the Operation Event register provide the following Questionable Status Group The Questionable Status group consisting of the Questionable Condition register the Questionable Positive Transition register the Questionable Negative Transition register the Questionable Event register and the Questionable Event Enable register is used to determine the specific condition that set bit 3 in the Summary Status Byte 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 17 of 37 SCPI Command Description ABORt Subsystem The ABORt command is a single command subsystem There are no subcommands or associated data parameters as shown below The ABORt command along with the TRIGger and INITiate commands comprise the Trigger group of commands Command Parameters Unit Remark default ABORt ABORt ABORt This command causes the List or Step sweep in progress to abort Even if INIT CONT ALL is set to ON the sweep will not immediately re initiate DISPlay Subsystem The DISPlay subsystem controls the display of the front panel data display Command Parameters Unit Remark default DISPlay WINDow TEXT STATe ONJOFF 1 0 FW2 4 DISPlay REMote ONJOFF 1 0 FW2 4 D
42. ommand turns the automatic power level control on and off ALC HOLD SOURce POWer ALC HOLD ON OFF 1 0 SOURce POWer ALC Devices with option PE only This command sets the automatic level control into hold mode The amplitude level control loop is open ATTenuation SOURce POWer ATTenuation lt value gt SOURce POWer ATTenuation Devices with option PE only 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 21 of 37 This command sets the power range extension attenuator This command will also turn off automatic attenuation setting Refer to SOURce POWer ATTenuation AUTO OFF for details Attenuator input RF power shall be 30 10 dBm e g using a SOURce POWer ATTenuation value of 50 dB the output RF power range is 80 40 dBm ATTenuation AUTO SOURce POWer ATTenuation AUTO ON OFF 1 0 SOURce POWer ATTenuation AUTO Devices with option PE only This command turns the power range extension on or off Turning it off allows fast power sweeps for devices featuring an extended output power range ATTenuation LIST SOURce POWer ATTenuation LIST Devices with option PE only This query returns a comma separated list of available attenuation settings These can be set using the SOURce POWer ATTenuation command Available settings are 0 35 70 dB for option PE O 10 20 110 dB for option PE2 SOURce ROSCillator Subsystem Command Paramet
43. perations are defined in the IEEE 802 2 standard The BNC MODEL 835 3 support the following LAN interface protocols 1 Socket based LAN the application programming interface API provided with the instrument supports general programming using the LAN interface under Windows operating system 2 VXI 11 SCPI version 1999 commands 3 Telephone Network TELNET TELNET is used for interactive one command at a time instrument control 4 Internet protocol using a web browser Firefox Internet Explorer firmware 2 2 upwards For LAN operation the signal generator must be connected to the LAN and an IP address must be assigned to the signal generator either manually or by using DHCP client service Your system administrator can tell you which method to use Most current LAN networks use DHCP DHCP Configuration If the DHCP server uses dynamic DNS to link the hostname with the assigned IP address the hostname may be used in place of the IP address Otherwise the hostname is not usable Using Sockets LAN Sockets LAN is a method used to communicate with the signal generator over the LAN interface using the Transmission Control Protocol Internet Protocol TCP IP A socket is a fundamental technology used for computer networking and allows applications to communicate using standard mechanisms built into network hardware and operating systems The method accesses a port on the signal generator from which bidirectional communication with a
44. s command sets the enable mask of the questionable status event register QUEStionable PTR STATus QUEStionable PTR This command sets the positive transition filter of the questionable status event register QUEStionable NTR STATus QUEStionable NTR This command sets the negative transition filter of the questionable status event register SYSTem Subsystem Command Parameters Unit Remark default SYSTem ERRor NEXT SYSTem PRESet Firmware 2 216 SYSTem VERSion SYSTem LOCK SYSTem LOCK RELease Firmware 2 216 ERRor SYSTem ERRor NEXT Return Parameters Integer error number Query command is a request for the next entry in the instrument s error queue Error messages in the queue contain an integer in the range 32768 32768 denoting an error code and associated descriptive text PRESet SYSTem PRESet Resets most signal generator functions to factory defined conditions This command is similar to the RST command VERSion SYSTem VERSion Returns the SCPI version number that the instrument software complies with 1999 0 LOCK SYSTem LOCK Locks disables front panel control LOCK RELease 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 34 of 37 SYSTem LOCK RELease Unlocks enables front panel control SYSTem COMMunicate Subsystem Command Para
45. se modulation for the selected path RST 0 PULM MODE SOURce PULM MODE FIXed LIST SOURce PULM MODE This command sets the modulation mode With FIXed the normal ON OFF modulation can be performed With LIST a arbitrary bit pattern can be loaded that will be used to modulate the carrier LIST mode will be available with firmware 2 1 RST 0 TRIGger Subsystem Triggers control the playback by telling the BNC MODEL 835 3 when to play the signal Depending on the trigger settings for the BNC MODEL 835 3 the waveform playback can occur once continuously or the BNC MODEL 835 3 may start and stop playing the waveform repeatedly GATE mode A trigger signal comprises both positive and negative signal transitions states which are also called high and low periods You can configure the BNC MODEL 835 3 to trigger on either state of the trigger signal It is common to have multiple triggers also referred to as trigger occurrences or events occur when the signal generator requires only a single trigger In this situation the BNC MODEL 835 3 recognizes the first trigger and ignores the rest When you select a trigger mode you may lose the signal from the RF output until you trigger the waveform There are four parts to configuring the trigger 1 Choosing the trigger type which controls the waveform s transmission e NORMal trigger edge initiates stops sweeps 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nuc
46. st be separated from the header by a white space Permissible parameters are numerical values Boolean parameters text character strings and block data The type of parameter required for the respective command and the permissible range of values are specified in the command description Numerical values Numerical values can be entered in any form i e with sign decimal point and exponent Values exceeding the resolution of the instrument are rounded up or down The mantissa may comprise up to 255 characters the values must be in the value range 9 9E37 to 9 9E37 The exponent is introduced by an E or e Entry of the exponent alone is not allowed Units In the case of physical quantities the unit can be entered Permissible unit prefixes are G giga MA mega MHZ are also permissible K kilo M milli U micro and N nano If the unit is missing the basic unit is used Boolean Parameters Boolean parameters represent two states The ON state logically true is represented by ON or a numerical value unequal to 0 The OFF state logically false is represented by OFF or the numerical value 0 ON or OFF is returned by a query 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 13 of 37 Hierarchical Command Structure All SCPI commands except the common commands are organized in a hierarchical structure similar to the inverted tree file structure used in most computers The SCPI stand
47. st to last point for a list sweep e start to stop for a step sweep DOWN This choice reverses the direction of the sweep RST UP LIST DWELI SOURce LIST DWELI value value SOURce LIST DWELI POINts This command sets the dwell time for the current list sweep points Dwell time is used when IMMediate is the trigger source The dwell time is the amount of time the sweep is guaranteed to pause after setting the frequency and or power for the current point The setting enabled by this command is not affected by signal generator power on preset or RST The variable value is expressed in units of seconds LIST DELay SOURce LIST DELay lt value gt lt value gt SOURce LIST DELay POINts This command sets the off time for the current list sweep points Off time is used when IMMediate is the trigger source The off time is the amount of time the output is guaranteed to be blanked after setting the frequency and or power for the current point to suppress output transients during a frequency change The setting enabled by this command is not affected by signal generator power on preset or RST The variable lt value gt is expressed in units of seconds LIST DELay AUTO SOURce LIST DELay AUTO ON OFF 1 0 This command enabled the automatic blanking of the output during transients between two frequency steps RST ON LIST FREQency POINts SOURce LIST POINts This command queries the signal gener
48. t 9221 User ID admin Password 835 3 Ping Echo On 3 IEEE 488 Interface Commands IEEE Mandated Commands The required common commands are IEEE 488 2 mandated commands that are defined in the IEEE 488 2 standard and must be implemented by all SCPI compatible instruments These commands are identified by the asterisk at the beginning of the command keyword These commands are used to control instrument status registers status reporting synchronization and other common functions Commands declared mandatory by IEEE 488 2 CLS Clear Status Command ESE Standard Event Status Enable Command ESE Standard Event Status Enable Query ESR Standard Event Status Register Query IDN Identification Query OPC Operation Complete Command OPC Operation Complete Query RST Reset Command SRE Service Request Enable Command SRE Service Request Enable Query STB Read Status Byte Query TST Self Test Query WAI Wait to Continue Command CLS The Clear Status CLS command clears the status byte by emptying the error queue and clearing all the event registers including the Data Questionable Event Register the Standard Event Status Register the Standard Operation Status Register and any other registers that are summarized in the status byte ESE data The Standard Event Status Enable ESE command sets the Standard Event Status Enable Register The variable data represents the sum of the bits that will be enabled
49. tandard names and terms that are manufacturer and customer supported The advantage of SCPI for the ATE system programmer is reducing the time learning how to program new SCPI instruments after programming their first SCPI instrument Programmers who use programming languages such as BASIC C FORTRAN etc to send instrument commands to instruments will benefit from SCPI Also programmers who implement instrument device drivers for ATE program generators and or software instrument front panels will benefit by SCPI s advantages SCPI defines instrument commands parameters data and status It is not an application package programming language or software intended for instrument front panel control SCPI is designed to be layered on top of the hardware independent portion of IEEE 488 2 SCPI Command Types SCPI commands which are also referred to as SCPI instructions are messages to the instrument to perform specific tasks The BNC MODEL 835 3 command set includes e Common commands IEE488 2 mandated commands e SCPI required commands e SCPI optional commands per SCPI 1999 0 e SCPI compliant commands that are unique to the BNC MODEL 835 3 Not all of the commands supported by the instrument are taken from the SCPI standard however their syntax follows SCPI rules SCPI Command Syntax Typical SCPI commands consist of one or more keywords parameters and punctuation SCPI command keywords can be a mixture of upper and lower case
50. ts of seconds default 1000 uS SWEep DELay SOURce SWEep DELay lt value gt SOURce SWEep DELay This command sets the off time for the current step sweep points Off time is used when IMMediate is the trigger source The off time is the amount of time the sweep is guaranteed to pause after setting the frequency and or power for the current point The setting enabled by this command is not affected by signal generator power on preset or RST The variable value is expressed in units of seconds default 300 uS SWEep SPACing SOURce SWEep SPACing LINear LOGarithmic SOURce SWEep SPACing This command enables the signal generator linear or logrithmic sweep modes These commands require the signal generator to be in step mode The instrument uses the specified start frequency stop frequency and number of points for both linear and log sweeps RST LIN 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 26 of 37 STARt SOURce POWer STARt lt value gt lt unit gt SOURce POWer STARt This command sets the first amplitude point in a step sweep RST Range Refer to LEVel IMMediate AMPLitude command for the output power ranges STOP SOURce POWer STOP lt value gt lt unit gt SOURce POWer STOP This command sets the last amplitude point in a step sweep RST Range Refer to LEVel IMMediate AMPLitude command for the output power ranges
51. vice Request Enable Register The variable data is the decimal sum of the bits that will be enabled Bit 6 value 64 is ignored and cannot be set by this command 835 3 Berkeley Nucleonics Programmer s Manual v1 0 www Berkeley Nucleonics com Page 10 of 37 Range 0 255 The setting enabled by this command is not affected by signal generator preset or RST However cycling the signal generator power will reset it to zero SRE The Service Request Enable SRE query returns the value of the Service Request Enable Register Range 0 63 amp 128 191 STB The Read Status Byte STB query returns the value of the status byte including the master summary status MSS bit Range 0 255 TRG The Trigger TRG command triggers the device if LAN is the selected trigger source otherwise TRG is ignored TST The Self Test TST query initiates the internal self test and returns one of the following results O This shows that all tests passed 1 This shows that one or more tests failed Key Entry Run Complete Self Test WAI The Wait to Continue WAI command causes the signal generator to wait until all pending commands are completed before executing any other commands 4 SCPI Commands This chapter provides an introduction to SCPI programming that includes descriptions of the command types hierarchical command structure data parameters and notational conventions Information on BNC MODEL 835 3 status system and tri
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