YOKOGAWA wt3000 User manual

Precision Power Analyzer
Communication Interface
WT3000
IM 760301-17E
5th Edition
WT3000 Manual, Vol 2/3

iIM 760301-17E
5th Edition : March 2006 (YK)
All Rights Reserved, Copyright © 2004 Yokogawa Electric Corporation
Thank you for purchasing the WT3000 Precision Power Analyzer.
This Communication Interface User’s Manual describes the functions of the GP-IB, RS-
232, USB, and Ethernet interfaces and communication commands. To ensure correct
use, please read this manual thoroughly before beginning operation. After reading the
manual, keep it in a convenient location for quick reference whenever a question arises
during operation.
Three manuals, including this one, are provided as manuals for the WT3000. Please
read all of them.
Manual Title Manual No. Description
WT3000 Precision Power Analyzer IM 760301-01E Explains all functions and
User’s Manual procedures of the WT3000
(Vol 1/3) excluding the expansion functions and
communication functions.
WT3000 Precision Power Analyzer IM 760301-17E This manual. Explains the
Communication Interface functions for controlling the
User’s Manual (CD-ROM) WT3000 using communication
(Vol 2/3) commands.
WT3000 Precision Power Analyzer IM 760301-51E Explains the expansion functions
Expansion Function User’s Manual (motor evaluation function and options)
(Vol 3/3) of the WT3000 and their operating
procedures.
Note
•The contents of this manual are subject to change without prior notice as a result of
continuing improvements to the instrument’s performance and functions. 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 Electric Corporation is strictly prohibited.
•The TCP/IP software of this product and the document concerning the TCP/IP
software have been developed/created by YOKOGAWA based on the BSD
Networking Software, Release 1 that has been licensed from University of California.
USB Interface and Ethernet Interface
•The items below are needed on the PC to use the communication functions via the
USB interface.
•DL/WT series library (TMCTL)
•USB connection device driver between the PC and WT3000
•The item below is needed on the PC to use the communication functions via the
Ethernet interface.
•DL/WT series library (TMCTL)
The library and driver above can be downloaded from the following Web page.
http://www.yokogawa.com/tm/

ii IM 760301-17E
Trademarks
•Microsoft, Internet Explorer, MS-DOS, Windows, Windows NT, and Windows XP are
either registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
•Adobe, Acrobat, and PostScript are trademarks of Adobe Systems Incorporated.
•For purposes of this manual, the TM and ® symbols do not accompany their
respective trademark names or registered trademark names.
•Other company and product names are trademarks or registered trademarks of their
respective holders.
Revisions
•1st Edition December 2004
•2nd Edition June 2005
•3rd Edition January 2006
•4th Edition December 2006
•5th Edition March 2007

iiiIM 760301-17E
Structure of the Manual
This User’s Manual consists of the following sections:
Chapter 1 GP-IB Interface
Describes the functions and specifications of the GP-IB interface.
Chapter 2 RS-232 Interface (Option)
Describes the functions and specifications of the RS-232 interface.
Chapter 3 USB Interface (Option)
Describes the functions and specifications of the USB interface.
Chapter 4 Ethernet Interface (Option)
Describes the functions and specifications of the Ethernet interface.
Chapter 5 Before Programming
Describes the syntax used to transmit commands.
Chapter 6 Communication Commands
Describes all the commands one by one.
Chapter 7 Status Reports
Describes the status byte, various registers, queues, and other
information.
Appendix
Describes reference material such as an ASCII character code table.
Index

iv IM 760301-17E
Conventions Used in This Manual
Unit and Note
Type Symbol Meaning
Unit k 1000 Example: 100 kHz
K1024 Example: 640 KB (file data size)
Note Note Calls attention to information that is important for proper operation of the
instrument.
Subheadings
On pages that describe operating procedures, the following symbols, displayed
characters, and terminology are used to distinguish the procedures from their
explanations:
Procedure
Follow the numbered steps. All procedures are written with
inexperienced users in mind; experienced users may not need to
carry out all the steps.
Explanation
This subsection describes the setup parameters and the limitations
on the procedures.
Displayed Characters and Terminology Used in the Procedural Explanations
Panel Keys and Soft keys
Bold characters used in the procedural explanations indicate characters that are marked on the
panel keys or the characters of the soft keys or menus displayed on the screen.
SHIFT + Panel Key
SHIFT + key means you will press the SHIFT key to turn ON the SHIFT key followed by the
operation key. The setup menu marked in purple below the panel key that you pressed appears
on the screen.
Symbols Used in the Syntax
Symbols which are used in the syntax descriptions in Chapter 6 are shown below.
These symbols are referred to as BNF (Backus-Naur Form) symbols. For details on
the data, see pages 5-5 and 5-6.
Symbol Meaning Example Example of Input
< > Defined value. ELEMent<x> <x> = 1 to 4 ->ELEMENT2
{ } Select from values MODE:{RMS|MEAN|DC|RMEAN}? ->MODE:RMS?
given in { }.
|Exclusive OR
[ ] Can be omitted. NUMeric[:NORMal]:VALue? ->NUMERIC:VALUE?

vIM 760301-17E
Contents
Structure of the Manual .................................................................................................................. iii
Conventions Used in This Manual..................................................................................................iv
Chapter 1 GP-IB Interface
1.1 Names and Functions of Parts......................................................................................... 1-1
1.2 GP-IB Interface Functions ................................................................................................ 1-2
1.3 GP-IB Interface Specifications ......................................................................................... 1-3
1.4 Connecting the GP-IB Cable............................................................................................ 1-4
1.5 Setting the GP-IB Control ................................................................................................ 1-5
1.6 Responses to Interface Messages................................................................................... 1-6
Chapter 2 RS-232 Interface (Option)
2.1 Names and Functions of Parts......................................................................................... 2-1
2.2 RS-232 Interface Functions and Specifications ............................................................... 2-2
2.3 Connection via the RS-232 Interface ............................................................................... 2-3
2.4 Combination of Handshaking Methods ............................................................................ 2-5
2.5 Combination of Data Formats .......................................................................................... 2-7
2.6 Setting the RS-232 Control .............................................................................................. 2-8
Chapter 3 USB Interface (Option)
3.1 Names of Parts ................................................................................................................ 3-1
3.2 USB Interface Functions and Specifications .................................................................... 3-2
3.3 Connection via the USB Interface .................................................................................... 3-3
3.4 Setting the USB Control ................................................................................................... 3-4
Chapter 4 Ethernet Interface (Option)
4.1 Names and Functions of Parts......................................................................................... 4-1
4.2 Ethernet Interface Functions and Specifications.............................................................. 4-2
4.3 Setting the Ethernet Control............................................................................................. 4-4
Chapter 5 Before Programming
5.1 Messages ......................................................................................................................... 5-1
5.2 Commands....................................................................................................................... 5-3
5.3 Responses ....................................................................................................................... 5-4
5.4 Data ................................................................................................................................. 5-5
5.5 Synchronization with the Controller ................................................................................. 5-7
Chapter 6 Communication Commands
6.1 A List of Commands ......................................................................................................... 6-1
6.2 ACQuisition Group ......................................................................................................... 6-17
6.3 AOUTput Group ............................................................................................................. 6-19
6.4 CBCycle Group .............................................................................................................. 6-21
6.5 COMMunicate Group ..................................................................................................... 6-24
6.6 CURSor Group............................................................................................................... 6-26
6.7 DISPlay Group ............................................................................................................... 6-29
6.8 FILE Group .................................................................................................................... 6-47
6.9 FLICker Group ............................................................................................................... 6-52
6.10 HARMonics Group ......................................................................................................... 6-57
6.11 HCOPy Group ................................................................................................................ 6-59
6.12 HOLD Group ..................................................................................................................6-63
1
1
2
3
4
5
6
7
App
App
Index
Index

vi IM 760301-17E
Contents
6.13 IMAGe Group .................................................................................................................6-64
6.14 INPut Group ................................................................................................................... 6-66
6.15 INTEGrate Group ........................................................................................................... 6-74
6.16 MEASure Group............................................................................................................. 6-76
6.17 MOTor Group .................................................................................................................6-81
6.18 NUMeric Group .............................................................................................................. 6-84
6.19 RATE Group ................................................................................................................. 6-102
6.20 STATus Group .............................................................................................................. 6-103
6.21 STORe Group .............................................................................................................. 6-105
6.22 SYSTem Group ............................................................................................................ 6-109
6.23 WAVeform Group ......................................................................................................... 6-112
6.24 Common Command Group .......................................................................................... 6-114
Chapter 7 Status Reports
7.1 Status Reports ................................................................................................................. 7-1
7.2 Status Byte ....................................................................................................................... 7-3
7.3 Standard Event Register .................................................................................................. 7-5
7.4 Extended Event Register ................................................................................................. 7-7
7.5 Output Queue and Error Queue....................................................................................... 7-9
Appendix
Appendix 1 ASCII Character Codes .......................................................................................App-1
Appendix 2 Error Messages ...................................................................................................App-2
Appendix 3 IEEE 488.2-1992 .................................................................................................App-5
Index

GP-IB Interface
1-1IM 760301-17E
1
1
2
3
4
5
6
7
App
Index
Chapter 1 GP-IB Interface
1.1 Names and Functions of Parts
Front Panel
START STOP
REMOTE
CAL
SENSOR RATIO
MEASURING
RMS MEAN DC RMEAN
CURRENT RANGEVOLTAGE RANGE
MEASURING
RMS MEAN DC RMEAN
ALL
INPUT INFO.
MOTOR
SET
CURSOR NULL
MENU STORE SET
MENU
LOWER ITEM LOWER FORM ALLUSER SET
DISPLAY ITEM & ELEMENT
2
34
COMPEN
ESC
ELEMENT
ELEMENT
1
WIRING
MODE AUTO MODE AUTO
EXT SENSOR
RESET SET
PAGE PAGE
SCALING
HRM SET MEASURE SYNC SOURCE
AVG LINE FILTER
FREQ
FILTER
FILE
PRINT
MISC
STORE IMAGE SAVE
HELP
NUMERIC WAVE
OTHERS
ITEM FORM
U / I / P
WP/q/
TIME
USER
ELEMENT
UPDATE
RATE HOLD
SINGLE
INTEG
LOCAL
SHIFT
YOKOGAWA WT3000
PRECISION POWER ANALYZER
REMOTE indicator
Tu r ns ON when the WT3000 is in the remote mode (controlled via communications).
MISC key
Press this key to configure communications.
LCD
LOCAL key
Press this key to clear the remote mode (controlled via communications)
and enter the local mode in which key operations are enabled.
Rear Panel
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
1
30A MA X
EXT
ALL TERMINALS
1000V MAX TO
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
2
30A MA X
EXT
ALL TERMINALS
1000V MAX TO
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
3
30A MA X
EXT
ALL TERMINALS
1000V MAX TO
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
4
30A MA X
EXT
ALL TERMINALS
1000V MAX TO
TORQUE
± 20V MAX
± 20V MAX
SPEED
42V pk MAX
D/A OUTPUT
VIDEO-OUT
(VGA)
GP-IB
(IEEE488)
SERIAL
(RS-232) / USB
EXT. CLK
ETHERNET
100BASE-TX
MEAS. START
100-240V AC 50/60Hz
200VA MAX
FUSE 250V T 6.3A
GP-IB connector
Connector used to connect the WT3000 to the
controller (PC) using a GP-IB cable.
CAT II CAT II CAT II CAT II

1-2 IM 760301-17E
1.2 GP-IB Interface Functions
GP-IB Interface Functions
Listener Capability
• All of the information that you can set with the panel keys can be set through the GP-
IB interface except for turning ON/OFF the power and setting the communication
parameters.
• Receives commands from a controller requesting the output of setup parameters,
measured/computed data, waveform data, and other information.
•Also receives status report commands.
Talker Capability
•Outputs setup parameters, measured/computed data, waveform data, and other
information.
Note
Talk-only, listen-only, and controller functions are not available on this instrument.
Switching between Remote and Local Modes
When Switching from Local to Remote Mode
Receiving a REN (Remote Enable) message from the controller when the instrument is
in the local mode causes the instrument to switch to the remote mode.
•The REMOTE indicator is turned ON.
•All keys except the LOCAL key are disabled.
•Settings entered in local mode are retained even when the WT3000 switches to
remote mode.
When Switching from Remote to Local Mode
Pressing LOCAL key in remote mode puts the instrument in local mode. However, this
act is invalid if the instrument has been set to Local Lockout mode (see page 1-6) by the
controller.
•The REMOTE indicator is turned OFF.
•Key operations are enabled.
•Settings entered in remote mode are retained even when the WT3000 switches to
local mode.
Note
The GP-IB interface cannot be used simultaneously with other communication interfaces (RS-
232, USB, or Ethernet).

GP-IB Interface
1-3IM 760301-17E
1
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2
3
4
5
6
7
App
Index
1.3 GP-IB Interface Specifications
GP-IB Interface Specifications
Supported device: National Instruments
•AT-GPIB
•PCI-GPIB and PCI-GPIB+
•PCMCIA-GPIB and PCMCIA-GPIB +
NI-488.2M driver version 1.60 or later
Electrical and mechanical specifications: Conforms to IEEE St’d 488-1978
Functional specifications: See table below.
Protocol: Conforms to IEEE St’d 488.2-1992
Code used: ISO (ASCII) code
Mode: Addressable mode
Address setting: The address can be set in the range from 0 to
30.
Clear remote mode: Remote mode can be cleared by pressing
LOCAL key except when the instrument has
been set to Local Lockout mode 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, untalk on
MLA (My Listen Address), and no talk-only
capability.
Listener L4 Basic listener capability, unlisten on MTA (My
Talk Address), and 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 Full device trigger capability
Controller C0 No controller capability
Electrical characteristics E1 Open collector

1-4 IM 760301-17E
1.4 Connecting the GP-IB Cable
GP-IB Cable
The GP-IB connector used on this instrument is a 24-pin connector that conforms to the
IEEE St’d 488-1978. Use a GP-IB cable that conforms to this standard.
Connection Procedure
Connect the cable as shown below.
SERI
(RS
100
BASE-
TX
5
6.2
0V MAX
V
MAX
TORQUE
SPEED
D/A
OUTPUT
42V
pk
MAX
GP- IB
(IEEE488)
VIDEO-OUT
(VGA)
100- 240V
200VA MAX
FUSE250V
AC
T
START
ETHERNET
CLK
Precautions to Be Taken When Making Connections
•Firmly tighten the screws on the GP-IB cable connector.
•Use an NI (National Instruments) model GP-IB port (or card) on the PC side. For
details, see section 1.3.
•If a converter is used along the communication cable connecting the WT and PC (for
example, a GP-IB-to-USB converter), malfunctions can occur. For details, consult with
your Yokogawa dealer or representative.
•Multiple 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, each device must have its own unique address.
•Use a cable of length 2 m or less for connecting the devices.
•Make sure the total cable length does not exceed 20 m.
• When communicating, have at least two-thirds of the devices turned ON.
•When connecting multiple devices, connect them in a star or linear configuration (see
the figure below). Loop and parallel configurations are not allowed.
CAUTION
When connecting or disconnecting communication cables, make sure to turn
OFF the PC and the WT3000. Otherwise, erroneous operation or damage to
the internal circuitry may result.

GP-IB Interface
1-5IM 760301-17E
1
1
2
3
4
5
6
7
App
Index
1.5 Setting the GP-IB Control
Procedure
START STOP
REMOTE
CAL
MOTOR
SET
CURSOR NULL
MENU STORE SET
MENU
LOWER ITEM LOWER FORM ALL
USER SET
DISPLAY ITEM & ELEMENT
RESET SET
PAGE PAGE
SCALING
HRM SET MEASURE SYNC SOURCE
AVG LINE FILTER
FREQ
FILTER
FILE
PRINT
MISC
STORE IMAGE SAVE
HELP
NUMERIC WAVE
OTHERS
ITEM FORM
U / I / P
WP/q/
TIME
USER
ELEMENT
UPDATE
RATE HOLD
SINGLE
INTEG
LOCAL
SHIFT
To exit the menu during operation, press ESC located above
the soft keys.
In the procedural explanation below, the phrase “press the
cursor keys” may be used. This phrase refers to the
procedures for selecting items and entering values and
character strings. For details on the procedures, see section
3.14 in the User’s Manual IM760301-01E.
Cursor keys
1. Press MISC to display the Misc menu.
2. Press the Remote Control soft key to display the Remote Ctrl menu.
3. Press the Device soft key to select GP-IB.
Only the communication interface selected here is enabled. The WT3000 does not
accept commands that are transmitted to other unselected communication interfaces.
4. Press the cursor keys to set the address.
Explanation
Enter the following settings when using a controller to set information that can be
specified through key operation on the WT3000 or when outputting setup parameters or
output waveform display data to the controller.
Address
Set the address of the WT3000 within the following range for the addressable mode.
0 to 30
Each device that can be connected via GP-IB has a unique address within the GP-IB
system. This address is used to distinguish the device from others. Therefore, when
you connect the WT3000 to a PC, for example, make sure to assign a unique address to
the WT3000.
Note
Do not change the address while the controller or other devices are using the GP-IB system.

1-6 IM 760301-17E
1.6 Responses to Interface Messages
Responses to Interface Messages
Responses to a Uni-Line Message
•IFC (Interface Clear)
Clears the talker and listener functions. Stops output if data are being output.
•REN (Remote Enable)
Switches between the remote and local modes.
IDY (Identify) is not supported.
Responses to a Multi-Line Message (Address Command)
•GTL (Go To Local)
Switches to the local mode.
•SDC (Selected Device Clear)
•Clears the program message (command) being received and the output queue
(see page 7-9).
•*OPC and *OPC? commands in execution are void.
•The *WAI and COMMunicate:WAIT commands are immediately terminated.
•GET (Group Execute Trigger)
Same operation as the *TRG command.
PPC (Parallel Poll Configure) and TCT (Take Control) are not supported.
Responses to a Multi-Line Message (Universal Command)
•LLO (Local Lockout)
Disables LOCAL on the front panel to prohibit switching to the local mode.
•DCL (Device Clear)
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
polls the devices in order.
•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 Is an Interface Message
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)

GP-IB Interface
1-7IM 760301-17E
1
1
2
3
4
5
6
7
App
Index
Multi-Line Messages
Eight data lines are used to transmit multi-line messages. The messages are classified
as follows:
• Address Commands
These commands are valid when the instrument is designated as a listener or as a
talker. The following five types are available.
•Commands that are valid on an instrument that is designated as a listener
•GTL (Go To Local)
• SDC (Selected Device Clear)
• PPC (Parallel Poll Configure)
•GET (Group Execute Trigger)
•Commands that are valid on an instrument that is designated as a talker
TCT (Take Control)
•Universal Commands
These commands are valid on all instruments regardless of the listener and talker
designations. The following five types are available.
•LLO (Local Lockout)
•DCL (Device Clear)
•PPU (Parallel Poll Unconfigure)
•SPE (Serial Poll Enable)
•SPD (Serial Poll Disable)
In addition, listener address, talker address, and secondary commands are also
considered interface messages.
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
Secondary
commands
Multi-line messages
Interface messages that WT3000 supports are indicated with ★marks.
Note
The differences 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 the designation. Therefore, SDC messages
are directed at a particular instrument while DCL messages are directed at all instruments on
the bus.
1.6 Responses to Interface Messages

RS-232 Interface (Option)
2-1IM 760301-17E
1
2
3
4
5
6
7
App
Index
Chapter 2 RS-232 Interface (Option)
2.1 Names and Functions of Parts
Front Panel
START STOP
REMOTE
CAL
SENSOR RATIO
MEASURING
RMS MEAN DC RMEAN
CURRENT RANGEVOLTAGE RANGE
MEASURING
RMS MEAN DC RMEAN
ALL
INPUT INFO.
MOTOR
SET
CURSOR NULL
MENU STORE SET
MENU
LOWER ITEM LOWER FORM ALLUSER SET
DISPLAY ITEM & ELEMENT
2
34
COMPEN
ESC
ELEMENT
ELEMENT
1
WIRING
MODE AUTO MODE AUTO
EXT SENSOR
RESET SET
PAGE PAGE
SCALING
HRM SET MEASURE SYNC SOURCE
AVG LINE FILTER
FREQ
FILTER
FILE
PRINT
MISC
STORE IMAGE SAVE
HELP
NUMERIC WAVE
OTHERS
ITEM FORM
U / I / P
WP/q/
TIME
USER
ELEMENT
UPDATE
RATE HOLD
SINGLE
INTEG
LOCAL
SHIFT
YOKOGAWA WT3000
PRECISION POWER ANALYZER
LCD
REMOTE indicator
Turns ON when the WT3000 is in the remote mode (controlled via communications).
LOCAL key
Press this key to clear the remote mode (controlled via communications)
and enter the local mode in which key operations are enabled.
MISC key
Press this key to configure communications.
Rear Panel
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
1
30A MA X
EXT
CAT II
ALL TERMINALS
1000V MAX TO
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
2
30A MA X
EXT
CAT II
ALL TERMINALS
1000V MAX TO
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
3
30A MA X
EXT
CAT II
ALL TERMINALS
1000V MAX TO
ELEMENT
VOLTAGE
±
1000V MAX
1000V MAX
±
CURRENT
4
30A MA X
EXT
CAT II
ALL TERMINALS
1000V MAX TO
TORQUE
± 20V MAX
± 20V MAX
SPEED
42V pk MAX
D/A OUTPUT
VIDEO-OUT
(VGA)
GP-IB
(IEEE488)
SERIAL
(RS-232) / USB
EXT. CLK
ETHERNET
100BASE-TX
MEAS. START
100-240V AC 50/60Hz
200VA MAX
FUSE 250V T 6.3A
RS-232 connector
EIA-574 compliant: For the 9-pin EIA-232 (RS-232)
Connector used to connect the WT3000 to the controller
(PC) using an RS-232 interface cable.

2-2 IM 760301-17E
2.2 RS-232 Interface Functions and Specifications
Receiving Function
You can specify the same settings as those specified by front panel key operations.
Receives output requests for measured and computed data, setup parameters of the
panel, and error codes.
Sending Function
Outputs measured and computed data.
Outputs panel setup parameters and the status byte.
Outputs error codes that have occurred.
Switching between Remote and Local Modes
When Switching from Local to Remote Mode
If the WT3000 receives a “:COMMunicate:REMote ON” command from the PC when it
is in the local mode, it switches to the remote mode.
•The REMOTE indicator is turned ON.
•All keys except the LOCAL key are disabled.
•Settings entered in local mode are retained even when the WT3000 switches to
remote mode.
When Switching from Remote to Local Mode
Pressing LOCAL key in remote mode puts the instrument in local mode. However, this is
void when the WT3000 has received a “:COMMunicate:LOCKout ON” command from
the PC (local lockout condition). When the WT3000 receives a
“:COMMunicate:REMote OFF” command from the PC, the WT3000 switches to the
local mode regardless of the local lockout condition.
•The REMOTE indicator is turned OFF.
•Key operations are enabled.
•Settings entered in remote mode are retained even when the WT3000 switches to
local mode.
Note
The RS-232 interface cannot be used simultaneously with other communication interfaces
(GP-IB, USB, or Ethernet).
RS-232 Interface Specifications
Electrical characteristics:Conforms to EIA-574 (9-pin EIA-232 (RS-232))
Connection:Point-to-point
Transmission mode: Full-duplex
Synchronization:Start-stop synchronization
Baud rate: 1200, 2400, 4800, 9600, 19200, and 38400
Start bit:Fixed to 1 bit
Data length:7or 8 bits
Parity:Even, odd, or no parity
Stop bit:1or 2 bits
Connector:DELC-J9PAF-13L6 (JAE or equivalent)
Hardware handshaking: Select whether to fix the CA and CB signals to TRUE or use
the signals for flow control.
Software handshaking:Select whether to use the X-ON and X-OFF signals to control
the transmission data or both transmission and reception data.
X-ON (ASCII 11H)
X-OFF (ASCII 13H)
Received buffer length:256 bytes

RS-232 Interface (Option)
2-3IM 760301-17E
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3
4
5
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7
App
Index
2.3 Connection via the RS-232 Interface
When you connect the WT3000 to a PC, you must set the WT3000 so that the
handshaking method, baud rate, data format, and other parameters match those on the
PC side.
For details on the settings, see the following pages. In addition, use an interface cable
that meets the specifications of the WT3000.
Connector and Signal Names
2
1
3
4
5
6
7
8
9
2RD (Received Data): Received data from the PC.
Signal direction ..... input
3SD (Send Data): Transmitted data to the PC.
Signal direction ..... output
5SG (Signal Ground): Signal ground.
7RS (Request to Send): Handshaking signal to receive data from the PC.
Signal direction ..... output
8CS (Clear to Send): Handshaking signal to send data to the PC.
Signal direction ..... input
* Pins 1, 4, 6, and 9 are not used.
9-Pin to 25-Pin Adapter and Signal Names
58723
(2) (3) (4) (5) (7)
The numbers inside the parentheses are pin numbers for the 25-pin connector.
Signal Direction
The following figure shows the direction of the signals used by the RS-232 interface of
the WT3000.
2
3
8
7
Computer This
instrument
RS [Request to send]
SD [Send data]
RD [Receive data]
CS [Clear to send]

2-4 IM 760301-17E
RS-232 Standard Signals and Their JIS and CCITT Abbreviations
Pin No.
(9-pin connector)
Abbreviation
Serial (RS-232) Description CCITT JIS
5
3
2
8
7
AB (GND)
BA (TXD)
BB (RXD)
CB (CTS)
CA (RTS)
102 SG
103
104
106
105
SD
RD
CS
RS
Signal ground
Transmitted data
Request to send
Received data
Clear to send
Signal Wiring Example
The pin numbers are for the 9-pin connector.
In general, use a cross cable.
SD
RD
RS
CS
SG
SD
RD
RS
SG
• OFF-OFF / XON-XON
PC WT3000
SD
RD
RS
CS
SG
SD
RD
RS
SG
• XON-RTS(XON-RS)
PC WT3000
SD
RD
RS
CS
SG
SD
RD
RS
SG
• CTS-RTS(CS-RS)
PC WT3000
CS CS CS
2
3
8
7
5
2
3
8
7
5
2
3
8
7
5
2
3
8
7
5
2
3
8
7
5
2
3
8
7
5
2.3 Connection via the RS-232 Interface

RS-232 Interface (Option)
2-5IM 760301-17E
1
2
3
4
5
6
7
App
Index
2.4 Combination of Handshaking Methods
When using the RS-232 interface for transferring data, it is necessary for equipment on
both sides to agree on a set of rules to ensure the proper transfer of data. The set of
rules is called handshaking. Because there are various handshaking methods that can
be used between the WT3000 and the PC, one must make sure that the same method is
chosen by both the WT3000 and the PC.
You can choose any of the four methods in the table below.
Data Sending Control (control
method when sending data to a computer) Data Receiving Control (
control
method when receiving data from a computer)
Software
Handshake Software Handshake
Handshake format Descriptions→
NO-NO
XON-XON
XON-RTS
CTS-RTS
Handshake
Method Sending stops
when X-off is
received, and
sending is
resumed
when X-on is
received.
Sending stops
when CB(CTS) is
False, and
sending is
resumed when CB
is True.
No
handshake
No
handshake
X-off is sent
when received
data buffer
becomes 3/4-
full, and X-on is
sent when the
received data
buffer is only
1/4-full.
CA (RTS) is set to
False when
received data buffer
is only 3/4-full, and
is set to True when
received data buffer
is only 1/4-full.
Hardware
Handshake Hardware Handshake
OFF-OFF
XON-XON
XON-RS
CS-RS
The menu of
this instrument
OFF-OFF
Data Transmission Control
There is no handshaking between the WT3000 and the PC. The “X-OFF” and “X-ON”
signals are treated as data, and the CS signal is ignored.
Data Reception Control
There is no handshaking between the WT3000 and the PC. When the received buffer
becomes full, all overflow data are discarded.
RS = True (fixed).
XON-XON
Data Transmission Control
Software handshaking is performed between the WT3000 and the PC. When an “X-
OFF” code is received while sending data to the PC, the WT3000 stops the data
transmission. When the WT3000 receives the next “X-ON” code, the WT3000 resumes
the data transmission. The CS signal received from the PC is ignored.
Data Reception Control
Software handshaking is performed between the WT3000 and the PC. When the free
area of the receive buffer decreases to 64 bytes, the WT3000 sends an “X-OFF” code.
When the free area increases to 192 bytes, it sends an “X-ON” code.
RS = True (fixed).

2-6 IM 760301-17E
XON-RS
Data Transmission Control
Software handshaking is performed between the WT3000 and the PC. When an “X-
OFF” code is received while sending data to the PC, the WT3000 stops the data
transmission. When the WT3000 receives the next “X-ON” code, the WT3000 resumes
the data transmission. The CS signal received from the PC is ignored.
Data Reception Control
Hardware handshaking is performed between the WT3000 and the PC. When the free
area of the receive buffer decreases to 64 bytes, the instrument sets “RS = False.”
When the free area increases to 192 bytes, it sets “RS = True.”
CS-RS
Data Transmission Control
Hardware handshaking is performed between the WT3000 and the PC. When the CS
signal becomes False while sending data to the PC, the WT3000 stops the data
transmission. When the CS signal becomes True, the WT3000 resumes the data
transmission. The “X-OFF” and “X-ON” signals are treated as data.
Data Reception Control
Hardware handshaking is performed between the WT3000 and the PC. When the free
area of the receive buffer decreases to 64 bytes, the instrument sets “RS = False.”
When the free area increases to 192 bytes, it sets “RS = True.”
Precautions Regarding Data Reception Control
When handshaking is used to control the reception of data, data may still be sent from
the PC even if the free space in the receive buffer drops below 64 bytes. In this case,
after the receive buffer becomes full, the excess data will be lost, whether or not
handshaking is in effect. Data storage of data resumes when there is free space in the
buffer.
256 bytes
Used Free, 64 bytes
When handshaking is in use,
reception of data will stop when the
free space in the buffer drops to 64
bytes since data cannot be passed to
the main program fast enough to
keep up with the transmission.
Used Free, 192 bytes
After reception of data stops, data
continues to be passed to the internal
program. Reception of data starts
again when the free space in the
buffer increases to 192 bytes.
Used
Whether handshaking is in use or not,
if the buffer becomes full, any
additional data received is no longer
stored and is lost.
Data Receiving Control using Handshaking
Note
The PC program must be designed so that the received buffers of both the WT3000 and the
PC do not become full.
2.4 Combination of Handshaking Methods