YOKOGAWA WT310EH User manual

IM WT310E-17EN
2nd Edition
Digital Power Meter
WT310E/WT310EH/WT332E/WT333E
Communication Interface

i
IM WT310E-17EN
Thank you for purchasing the WT310E, WT310EH, WT332E, or WT333E Digital Power Meter. This
Communication Interface User’s Manual explains the following interface features and commands.
• USBinterface
• GP-IBinterface
• RS-232interface
• Ethernetinterface
To ensure correct use, please read this manual thoroughly before beginning operation.
After reading this manual, keep it in a safe place.
List of Manuals
The following manuals, including this one, are provided as manuals for this instrument. Please read
all manuals.
Manual Title Manual No. Description
WT310E/WT310EH/WT332E/WT333E
Digital Power Meter User’s Manual IMWT310E-01EN
The manual explains all features of this instrument,
except for the communication interface features, and
how to use them.
WT310E/WT310EH/WT332E/WT333E
Digital Power Meter
GettingStartedGuide
IMWT310E-02EN Provided as a printed manual. The manual explains
the handling precautions and basic operations of this
instrument and provides an overview of its features.
WT310E/WT310EH/WT332E/WT333E
Digital Power Meter
Communication Interface User’s Manual
IMWT310E-17EN This guide. This manual explains the
communication interface features of this
instrument and how to use them.
WT310E/WT310EH/WT332E/WT333E
Digital Power Meter IMWT310E-92Z1 Document for China
PDF files of all the manuals above are included in the accompanying CD.
The“EN”and“Z1”inthemanualnumbersarethelanguagecodes.
Contact information of Yokogawa offices worldwide is provided on the following sheet.
Document No. Description
PIM113-01Z2
List of worldwide contacts
Notes
• Thecontentsofthismanualaresubjecttochangewithoutpriornoticeasaresultofcontinuing
improvements to the instrument’s performance and functionality. The figures given in this manual
may differ from those that actually appear on your screen.
• Everyefforthasbeenmadeinthepreparationofthismanualtoensuretheaccuracyofits
contents. However, should you have any questions or find any errors, please contact your
nearestYOKOGAWAdealer.
• Copyingorreproducingalloranypartofthecontentsofthismanualwithoutthepermissionof
YOKOGAWAisstrictlyprohibited.
• SafetyprecautionsareprovidedintheGettingStartedGuide,IMWT310E-02EN.Besureto
observe the safety precautions.
• TheTCP/IPsoftwareofthisproductandthedocumentsconcerningithavebeendeveloped/
createdbyYOKOGAWAbasedontheBSDNetworkingSoftware,Release1thathasbeen
licensedfromtheRegentsoftheUniversityofCalifornia.
Trademarks
• Microsoft,InternetExplorer,MS-DOS,Windows,WindowsVista,Windows7,Windows8,and
Windows8.1areeitherregisteredtrademarksortrademarksofMicrosoftCorporationinthe
UnitedStatesand/orothercountries.
• AdobeandAcrobatareeitherregisteredtrademarksortrademarksofAdobeSystemsIncorporated.
• ModbusisaregisteredtrademarkofAEGSchneider.
• Inthismanual,the®andTMsymbolsdonotaccompanytheirrespectiveregisteredtrademark
or trademark names.
• Othercompanyandproductnamesareregisteredtrademarksortrademarksoftheirrespectiveholders.
Revisions
• 1stEdition:  September2015
• 2ndEdition:  October2017
2ndEdition:October2017 (YMI)
AllRightsReserved, Copyright ©2015YokogawaTest&MeasurementCorporation

ii IM WT310E-17EN
About the USB Interface and Ethernet Interface
• TousetheUSBcommunicationfeatures,yourPCmusthavethefollowing:
• Library of this instrument (TMCTL)
• USBdevicedriver for connecting this instrument to the PC
• TousetheEthernetcommunicationfeatures,yourPCmusthavethefollowing:
• Libraryofthisinstrument(TMCTL)
You can download the library and driver from the following web page.
 http://tmi.yokogawa.com/
 IfyouinstallWTViewerFreePlusinyourPC,theabovelibraryanddriverwillbeinstalled
automatically.
Sample Programs
Youcandownloadsampleprogramsforthisinstrumentfromthefollowingwebpage:
 http://tmi.yokogawa.com/
WTViewerFreePlus
WTViewerFreePlusisadedicatedsoftwareapplicationforthisinstrument.Itisincludedinthe
accompanying CD.
ByusingWTViewerFreePlus,youcandisplaymeasureddataonadedicatedwindow,save
measured data to the PC, and change the settings of this instrument from the PC.
ForinformationonhowtoinstallanduseWTViewerFreePlus,seetheWTViewerFreePlusUser’s
Manual,IM760121-02E.
Example of a Window Showing the Measured DataExample of a Window for Configuring the WT

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IM WT310E-17EN
Symbols and Notation Used in This Manual
Notes
The notes and cautions in this manual are categorized using the following symbols.
WARNING Calls attention to actions or conditions that could cause serious or fatal
injury to the user, and precautions that can be taken to prevent such
occurrences.
CAUTION Calls attention to actions or conditions that could cause light injury to the
user or cause damage to the instrument or user’s data, and precautions
that can be taken to prevent such occurrences.
French
AVERTISSEMENT Attire l’attention sur des gestes ou des conditions susceptibles
de provoquer des blessures graves (voire mortelles), et sur les
précautions de sécurité pouvant prévenir de tels accidents.
ATTENTION Attire l’attention sur des gestes ou des conditions susceptibles de
provoquer des blessures légères ou d’endommager l’instrument ou les
données de l’utilisateur, et sur les précautions de sécurité susceptibles
de prévenir de tels accidents.
Note
Calls attention to information that is important for proper operation of the
instrument.
Units
kDenotes1000.Example:100kHz(frequency)
KDenotes1024.Example:720KB(filesize)
Characters That Appear on the 7-Segment LED
Becausethisinstrumentusesa7-segmentLEDdisplay,numbers,letters,andmathematical
symbolsaredisplayedusingspecialcharactersinthemannershownbelow.Someofthecharacters
shown below are not used by this instrument.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
Lowercase c
Lowercase h
U
V
W
X
Y
Z
+
–
×
÷
^ (exponentiation)

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Symbols and Conventions Used in Procedural Explanations
In chapters 1 to 4, the contents of the procedural explanations are indicated using the following
symbols.
Procedure Operationsareexplainedusingflowcharts.Seetheexamplebelowforan
explanation of how various operations are indicated. All procedures are written
under the assumption that you are starting operation at the beginning of the
procedure, so you may not need to carry out all the steps in a procedure when
you are changing the settings.
Example:OperationsforsettingtheGP-IBaddress
2.
Select the
communication function.
(Display B)
1. 3.Set the address.
(Display D) 6.
Press and to set the number.
Press to move the digit.
4.
5.
Set, close menu.
The above flow chart indicates the following operations.
You can configure items that are blinking.
1.
Press INTERFACE.
AmenuappearsindisplayB.
2.
 Use▲or▼toselectGPib.
Pressing either key cycles through 4 menu items.
3.
Press SETtoconfirmtheselectionofGPib.
TheGPibfunctionmenuthatyouselectedinstep2appearsindisplayD.
4.
 Use▲or▼toselecttheGP-IBaddress.
5.
If necessary, press the SHIFT keysothatit illuminates,and thenpress ▼to movethe input
digit.
6.
Press SET to confirm the setting and return the menu display to the measurement data display.
TheselectedorsetitemisconfirmedwhenyoupressSET.
• Whenyouaremakinganumberpositive(nosign)ornegative(–)orsettinganumber,whenthe
digit in the display that the input will be added to is blank, an underscore flashes at the position
of the digit.
• Whileyouareperformingmenuoperations,toleavethemenudisplay,pressHOLD(ESC).All
settingchangesthatyouhaveconfirmedbypressingtheSETkeywillbereflectedinthesettings.
Explanation This section describes the setup items and the limitations regarding the
procedures.
Symbols Used in the Syntax
Thefollowingtablecontainsthesymbolsthatareusedinthesyntaxdiscussedmainlyinchapters5
and6.ThesesymbolsarereferredtoasBNF(Backus-NaurForm)symbols.Fordetailsonhowto
writedatausingthesesymbols,seepages5-6and5-7.
Symbol Meaning Example Example of Input
<> A defined value ELEMent<x> <x> = 1 to 3 ELEMENT2
{}
|Selectanoptionin{} ExclusiveOR
MODE {RMS|VMEan|DC} MODE RMS
[] Can be omitted NUMeric[:NORMal]:VALue? NUMERIC:VALUE?
How to Use This Manual

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2
3
4
5
6
7
8
9
App
Index
Contents
AbouttheUSBInterfaceandEthernetInterface ..............................................................................ii
SamplePrograms .............................................................................................................................ii
WTViewerFreePlus ...........................................................................................................................ii
SymbolsandNotationUsedinThisManual ....................................................................................iii
Chapter 1 USB Interface
1.1 ComponentNamesandFunctions................................................................................... 1-1
1.2 USBInterfaceFeaturesandSpecications...................................................................... 1-2
1.3 ConnectingtotheUSBInterface...................................................................................... 1-3
1.4 ConguringtheUSBSettingsofThisInstrument............................................................. 1-4
Chapter 2 GP-IB Interface
2.1 ComponentNamesandFunctions................................................................................... 2-1
2.2 GP-IBInterfaceFeaturesandSpecications ................................................................... 2-2
2.3 ConnectingtotheGP-IBInterface ................................................................................... 2-4
2.4 ConguringtheGP-IBSettingsofThisInstrument........................................................... 2-6
2.5 ResponsestoInterfaceMessages ................................................................................... 2-7
Chapter 3 RS-232 Interface
3.1 ComponentNamesandFunctions................................................................................... 3-1
3.2 RS-232InterfaceFeaturesandSpecications................................................................. 3-2
3.3 ConnectingtotheRS-232Interface ................................................................................. 3-3
3.4 ConguringtheRS-232SettingsofThisInstrument ........................................................ 3-5
Chapter 4 Ethernet Interface
4.1 ComponentNamesandFunctions................................................................................... 4-1
4.2 EthernetInterfaceFeaturesandSpecications ............................................................... 4-2
4.3 Connecting to the Ethernet Interface................................................................................ 4-3
4.4 ConguringtheEthernetSettingsofThisInstrument....................................................... 4-4
Chapter 5 Programming Overview
5.1 Messages ......................................................................................................................... 5-1
5.2 Commands ....................................................................................................................... 5-3
5.3 Responses ....................................................................................................................... 5-5
5.4 Data.................................................................................................................................. 5-6
5.5 SynchronizationwiththeController.................................................................................. 5-8
Chapter 6 Commands
6.1 ListofCommands ............................................................................................................ 6-1
6.2 AOUTputGroup ............................................................................................................... 6-5
6.3 COMMunicategroup ........................................................................................................ 6-7
6.4 DISPlaygroup .................................................................................................................. 6-8
6.5 HARMonicsGroup ......................................................................................................... 6-10
6.6 HOLDGroup ...................................................................................................................6-11
6.7 INPutGroup ................................................................................................................... 6-12
6.8 INTEGrateGroup ........................................................................................................... 6-16
6.9 MATHGroup................................................................................................................... 6-17
6.10 MEASureGroup ............................................................................................................. 6-18
6.11 NUMericGroup .............................................................................................................. 6-19

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Contents
6.12 RATEGroup ................................................................................................................... 6-29
6.13 RECallGroup ................................................................................................................. 6-30
6.14 STATusgroup................................................................................................................. 6-31
6.15 STOReGroup................................................................................................................. 6-32
6.16 SYSTemGroup .............................................................................................................. 6-33
6.17 CommonCommandGroup ............................................................................................ 6-34
Chapter 7 Status Reports
7.1 AboutStatusReports ....................................................................................................... 7-1
7.2 StatusByte ....................................................................................................................... 7-3
7.3 StandardEventRegister .................................................................................................. 7-4
7.4 ExtendedEventRegister.................................................................................................. 7-5
7.5 OutputandErrorQueues ................................................................................................. 7-6
Chapter 8 WT210/WT230 Compatible Commands
8.1 WT210/WT230CompatibleCommandMode .................................................................. 8-1
Chapter 9 Modbus/TCP Communication
9.1 OverviewofModbus/TCPCommunication....................................................................... 9-1
9.2 CommunicationwithClientDevices ................................................................................. 9-2
9.3 RegisterFunctionsandApplications ................................................................................ 9-3
Appendix Appendix 1 Error Messages..................................................................................................App-1
Appendix2 AbouttheIEEE488.2-1992Standard................................................................App-5
Index

1-1
IM WT310E-17EN
USB Interface
1
2
3
4
5
6
7
8
9
App
Index
1.1 Component Names and Functions
Front Panel
LOCAL key
Press this key to switch to local mode. In local mode, remote mode
(remote control using communication commands) is cleared, and
key operation becomes possible.
This key is disabled when local lockout (see page 1-2) has been
activated by a controller.
INTERFACE key (page 1-4)
Press this key to view the serial number that is used in
USB TMC communication.
Rear Panel
USB port
This port is for connecting this instrument to a controller (such as
a PC) using a USB cable. For details on how to connect, see
page 1-3.
Chapter 1 USB Interface

1-2 IM WT310E-17EN
1.2 USB Interface Features and Specifications
USB Interface Features
Reception Feature
• Youcanusethereceptionfeaturetospecifythesamesettingsthatyouspecifybyusingthefront
panel keys.
• Outputrequestsformeasuredandcomputeddata,panelsetupparameters,anderrorcodescan
be received.
Transmission Feature
• Thisinstrumentcantransmitmeasuredandcomputeddata.
• Thisinstrumentcantransmitpanelsetupparametersandthestatusbyte.
• Thisinstrumentcantransmiterrorcodeswhenerrorsoccur.
USB Interface Specifications
Item Specifications
Numberofports 1
Connector TypeBconnector(receptacle)
Electrical and mechanical ComplieswithUSBRev.2.0
Supportedtransfermodes HS(HighSpeed;480Mbps)andFS(FullSpeed;12Mbps)
Supportedprotocols USBTMC-USB488(USBTestandMeasurementClassVer.1.0)
PC system requirements PCrunningWindows8(32bit/64bit),Windows7(32bit/64bit),orWindows
Vista(32bit)EnglishandJapaneseandwithaUSBport
Switching between Remote and Local Modes
When Switching from Local to Remote Mode
This instrument switches to remote mode when it is in local mode and it receives a
:COMMunicate:REMoteONcommandfromthePC.
• TheREMOTEindicatorilluminates.
• AllkeysexcepttheSHIFT (LOCAL) key are disabled.
• Settingsenteredinlocalmodeareretainedevenwhenthisinstrumentswitchestoremotemode.
When Switching from Remote to Local Mode
WhenthisinstrumentisinremotemodeandyoupressSHIFT(LOCAL),thisinstrument
switches to local mode. However, this does not work if this instrument has received a
:COMMunicate:LOCKout ON command from the PC. This instrument switches to local mode
when it receives a :COMMunicate:REMote OFF command from the PC, regardless of the local
lockout state.
• TheREMOTEindicatorturnsoff.
• Keyoperationsareenabled.
• Settingsenteredinremotemodeareretainedevenwhenthisinstrumentswitchestolocalmode.
Note
YoucannotusetheUSBinterfacesimultaneouslywithotherinterfaces(GP-IB,RS-232,andEthernet
interfaces).

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IM WT310E-17EN
USB Interface
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Index
1.3 Connecting to the USB Interface
Connection Procedure
Connect the cable as shown below.
WT310E/WT310EH WT332E/WT333E
Notes on Connection
• BesuretoinserttheUSBcableconnectorsfirmlyintotheUSBports.
• IfyouareconnectingmultipledevicesbyusingaUSBhub,connectthisinstrumenttotheUSB
hub port that is closest to the port that the controller is connected to.
• DonotconnectorremoveUSBcablesfromthetimewhenthisinstrumentisturnedonuntil
operation becomes available (approximately 20 to 30 seconds). Doing so may damage this
instrument.
• OntheWT310EandWT310EH,itisphysicallyimpossibletoconnectaGP-IBcableandaUSB
cable at the same time.

1-4 IM WT310E-17EN
1.4 Configuring the USB Settings of This
Instrument
ThissectionexplainsthefollowingsettingforcontrollingthisinstrumentremotelythroughaUSB
interface:
ProcedureFollow the procedure indicated by the thick lines in the following menu.
• ViewingtheserialnumberthatisusedinUSB TMC communications
2.
Select the
communication function.
1.
Instrument number
is shown in displays
C and D.
Close menu.
or 3.
(Display B)
Note
• Onlyuseonecommunicationinterface:USB,GP-IB,RS-232,orEthernet.Ifyousendcommands
simultaneously from more than one communication interface, this instrument will not execute the
commands properly.
• InstalltheYOKOGAWAUSBTMC(TestandMeasurementClass)driveronyourPC.Forinformation
abouthowtoobtaintheYOKOGAWAUSBTMCdriver,contactyournearestYOKOGAWAdealer.Youcan
alsoaccesstheYOKOGAWAUSBdriverdownloadwebpageanddownloadthedriver.
 http://tmi.yokogawa.com/
• DonotuseUSBTMCdrivers(orsoftware)suppliedbyothercompanies.

2-1
IM WT310E-17EN
GP-IB Interface
Chapter 2 GP-IB Interface
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Index
2.1 Component Names and Functions
Front Panel
LOCAL key
Press this key to switch to local mode. In local mode, remote mode
(remote control using communication commands) is cleared, and
key operation becomes possible.
This key is disabled when local lockout (see page 2-3) has been
activated by a controller.
INTERFACE key (page 2-6)
Press this key to set the GP-IB address.
Rear Panel
GP-IB port
This port is for connecting this instrument to a controller (such as a PC)
using a GP-IB cable. For details on how to connect, see page 2-4.

2-2 IM WT310E-17EN
2.2 GP-IB Interface Features and Specifications
GP-IB Interface Features
Reception Feature
• Youcanusethereceptionfeaturetospecifythesamesettingsthatyouspecifybyusingthefront
panel keys.
• Outputrequestsformeasuredandcomputeddata,panelsetupparameters,anderrorcodescan
be received.
Transmission Feature
• Thisinstrumentcantransmitmeasuredandcomputeddata.
• Thisinstrumentcantransmitpanelsetupparametersandthestatusbyte.
• Thisinstrumentcantransmiterrorcodeswhenerrorsoccur.
Note
Talk-only,listen-only,andcontrollercapabilitiesarenotavailable.
GP-IB Interface Specifications
Item Specifications
Supporteddevices NationalInstrumentsCorporation
•PCI-GPIBorPCI-GPIB+
•PCIe-GPIBorPCIe-GPIB+
•PCMCIA-GPIBorPCMCIA-GPIB+
(notsupportedonWindowsVistaorWindows7.)
•GPIB-USB-HS
DriverNI-488.2MVersion2.8.1andlater
Electrical and mechanical ConformstoIEEESt’d488-1978
Functional specifications Seethetablebelow.
Protocol ConformstoIEEESt’d488.2-1992
Code ISO(ASCII)codes
Mode Addressable mode
Address setting Press INTERFACE, and then select the GPIBmenu.Settheaddresstoa
value between 0 and 30.
Clear remote mode Press SHIFT (LOCAL) to clear remote mode.
This is not possible when local lockout has been activated by the controller.
Functional Specifications
Function Subset Name Description
Sourcehandshaking SH1 Full source handshaking capability
Acceptor handshaking AH1 Full acceptor handshaking capability
Talker T6 Basictalkercapability,serialpolling,anduntalkonMLA(My
ListenAddress).Notalk-onlycapability.
Listener L4 BasiclistenercapabilityandunlistenonMTA(MyTalkAddress).
Nolisten-onlycapability
Servicerequest SR1 Full service request capability
Remotelocal RL1 Full remote/local capability
Parallel polling PP0 Noparallelpollingcapability
Device clear DC1 Full device clear capability
Device trigger DT1 Device trigger capability
Controller C0 Nocontrollercapability
Electric characteristics E1 Open collector

2-3
IM WT310E-17EN
GP-IB Interface
2.2 GP-IB Interface Features and Specifications
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Switching between Remote and Local Modes
When Switching from Local to Remote Mode
ThisinstrumentswitchestoremotemodewhenitisinlocalmodeanditreceivesaREN(Remote
Enable) message from the PC.
• TheREMOTEindicatorilluminates.
• AllkeysexcepttheSHIFT (LOCAL) key are disabled.
• Settingsenteredinlocalmodeareretainedevenwhenthisinstrumentswitchestoremotemode.
When Switching from Remote to Local Mode
When this instrument is in remote mode and you press SHIFT (LOCAL), this instrument switches
tolocalmode.Thiskeyisdisabledwhenlocallockout(seepage2-7)hasbeenactivatedbya
controller.
• TheREMOTEindicatorturnsoff.
• Keyoperationsareenabled.
• Settingsenteredinremotemodeareretainedevenwhenthisinstrumentswitchestolocalmode.
Note
YoucannotusetheGP-IBinterfacesimultaneouslywithotherinterfaces(USBandEthernetinterfaces).

2-4 IM WT310E-17EN
2.3 Connecting to the GP-IB Interface
GP-IB Cable
ThisinstrumentisequippedwithanIEEESt’d488-197824-pinGP-IBconnector.UseaGP-IB
cable that conforms to this standard.
Connection Procedure
Connect the cable as shown below.
WT310E/WT310EH WT332E/WT333E
Notes on Connection
• FirmlytightenthescrewsontheGP-IBcableconnector.
• OnthePCend,useaGP-IBboard(orcard)madebyNationalInstruments.Fordetails,see
section 2.2.
• ThisinstrumentmaynotoperateproperlyifthisinstrumentisconnectedtothePCthrough
converters(suchasaGP-IBtoUSBconverter).Formoredetails,contactyournearest
YOKOGAWAdealer.
• Severalcablescanbeusedtoconnectmultipledevices.However,nomorethan15devices,
including the controller, can be connected on a single bus.
• Whenconnectingmultipledevices,youmustassignauniqueaddresstoeachdevice.
• Usecablesthatare2morshorterinlengthtoconnectdevices.
• Makesurethetotallengthofallcablesdoesnotexceed20m.
• Whendevicesarecommunicating,haveatleasttwo-thirdsofthedevicesonthebusturnedon.
• Toconnectmultipledevices,wiretheminadaisy-chainorstarconfigurationasshownbelow.
You can also mix these configurations. Loop configuration is not allowed.
• OntheWT310EandWT310EH,itisphysicallyimpossibletoconnectaGP-IBcableandaUSB
cable at the same time.

2-5
IM WT310E-17EN
GP-IB Interface
2.3 Connecting to the GP-IB Interface
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CAUTION
BesuretoturnoffthePCandthisinstrumentbeforeyouconnectorremovecommunication
cables. Otherwise, erroneous operation may result, or the internal circuitry may break.
French
ATTENTION
VeilleràmettrelePCetl’instrumenthorstensionavantdebrancheroudedébrancherles
câblesdecommunication,pouréviterdeprovoquerdesdysfonctionnementsoudescourts-
circuits internes.

2-6 IM WT310E-17EN
2.4 Configuring the GP-IB Settings of This
Instrument
ThissectionexplainsthefollowingsettingforcontrollingthisinstrumentremotelythroughaGP-IB
interface:
ProcedureFollow the procedure indicated by the thick lines in the following menu.
Setting the GP-IB Address
2.
Select the
communication function.
1.
3.Set the address.
(Display D) 6.
Press and to set the number.
Press to move the digit.
4.
5.
Set, close menu.
(Display B)
Note
• Onlyuseonecommunicationinterface:USB,GP-IB,orEthernet.Ifyousendcommandssimultaneously
from more than one communication interface, this instrument will not execute the commands properly.
• WhenthecontrolleriscommunicatingwiththisinstrumentorwithotherdevicesthroughGP-IB,donot
change the address.
• EachdevicethatisconnectedbyGP-IBhasitsownuniqueaddressintheGP-IBsystem.Thisaddress
is used to distinguish between different devices. Therefore, you must assign a unique address to this
instrument when connecting it to a PC or other device.

2-7
IM WT310E-17EN
GP-IB Interface
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Index
2.5 Responses to Interface Messages
Responses to Interface Messages
Responses to Uni-Line Messages
• IFC (Interface Clear)
 Clearsthetalkerandlistenerfunctions.Stopsdatatransmissionifitisinprogress.
• REN (Remote Enable)
 Switchesbetweentheremoteandlocalmodes.
IDY (Identify) is not supported.
Responses to Multi-Line Messages (Address commands)
• GTL (Go To Local)
 Switchestheinstrumenttolocalmode.
• SDC (Selected Device Clear)
• Clearstheprogrammessage(command)beingreceivedandtheoutputqueue(seepage7-6
for details).
• Discards*OPCand*OPC?commandsthatarebeingexecuted.
• Immediatelyaborts*WAIandCOMMunicate:WAITcommands.
• GET (Group Execute Trigger)
Thesameoperationasthe*TRGcommand.
PPC (Parallel Poll Configure) and TCT (Take Control) are not supported.
Responses to Multi-Line Messages (Universal commands)
• LLO (Local Lockout)
Prohibits switching to local mode by disabling the LOCAL key on the front panel.
• DCL (Device Clear)
 ThesameoperationastheSDCmessage.
• SPE (Serial Poll Enable)
 Setsthetalkerfunctiononalldevicesonthebustoserialpollingmode.Thecontrollerwillpoll
each device one by one.
• SPD (Serial Poll Disable)
Clears the serial polling mode of the talker function on all devices on the bus.
PPU (Parallel Poll Unconfigure) is not supported.
What Are Interface Messages?
Interface messages are also referred to as interface commands or bus commands. They are
commandsthatareissuedbythecontroller.Theyareclassifiedasfollows:
Uni-line Messages
Asinglecontrollineisusedtotransmituni-linemessages.Thefollowingthreetypesareavailable.
• IFC(InterfaceClear)
• REN(RemoteEnable)
• IDY(Identify)

2-8 IM WT310E-17EN
2.5 Responses to Interface Messages
Multi-line Messages
Eightdatalinesareusedtotransmitmulti-linemessages.Themessagesareclassifiedasfollows:
• AddressCommands
 Someaddresscommandsarevalidwhenadeviceisdesignatedasalistener,andsomeare
valid when it is designated as a talker. The following five commands are available.
Commands available to a device designated as a listener
• GTL(GoToLocal)
• SDC(SelectedDeviceClear)
• PPC(ParallelPollConfigure)
• GET(GroupExecuteTrigger)
Commands available to a device designated as a talker
• TCT(TakeControl)
• UniversalCommands
Universal commands are available to all devices regardless of their listener or talker designation.
The following five commands are available.
• LLO(LocalLockout)
• DCL(DeviceClear)
• PPU(ParallelPollUnconfigure)
• SPE(SerialPollEnable)
• SPD(SerialPollDisable)
Thereareotherinterfacemessages:listener-address,talk-address,andsecondarycommands.
Interface messages
Uni-line
messages Address
commands Universal commands
IFC*
REN*
IDY GTL*
SDC*
PPC
GET*
TCT
LLO*
DCL*
PPU
SPE*
SPD*
Listener
Address Talker Address 2 Command
Multi-line Messages
This instrument supports interface messages marked with an asterisk.
Note
Difference between SDC and DCL
Inmulti-linemessages,SDCmessagesarethosethatrequiretalkerorlistenerdesignationandDCL
messagesarethosethatdonotrequireadesignation.Therefore,SDCmessagesaredirectedataparticular
instrument while DCL messages are directed at all instruments on the bus.

3-1
IM WT310E-17EN
RS-232 Interface
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9
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Index
3.1 Component Names and Functions
Front Panel
LOCAL key
Press this key to switch to local mode. In local mode, remote mode
(remote control using communication commands) is cleared, and
key operation becomes possible.
This key is disabled when local lockout (see page 3-2) has been
activated by a controller.
INTERFACE key (page 3-5)
Press this key to set the handshaking, data format,
baud rate, or terminator.
Rear Panel
RS-232 connector
This port is for connecting this instrument to a controller (such as a PC)
using an RS-232 cable. For details on how to connect, see page 3-4.
Chapter 3 RS-232 Interface