YOKOGAWA wt1600 User manual

Digital Power Meter
Communication Interface
IM 760101-11E
4th Edition

iIM 760101-11E
Introduction
Thank you for purchasing YOKOGAWA’s WT1600 Digital Power Meter.
This Communication Interface User’s Manual describes the functions and commands of
the GP-IB and serial interfaces. To ensure proper use of the GP-IB/serial/Ethernet
interfaces, please read this manual thoroughly.
Keep the manual in a safe place for quick reference whenever a question arises.
Two manuals are provided with the WT1600 including this Communication Interface
User’s Manual.
Manual Name Manual No. Description
WT1600 Digital Power Meter IM 760101-01E Describes all functions except for the
User’s Manual communications functions and operation
procedures of the instrument.
WT1600 Digital Power Meter IM 760101-11E Describes the communications functions of
Communication User’s Manual the GP-IB/serial/Ethernet interface.
Note
•The contents of this manual are subject to change without prior notice as a result of
improvements in instrument’s performance and functions.
•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 reproduction of all or any part of the contents of this manual without
YOKOGAWA’s permission is strictly prohibited.
Trademarks
•MS-DOS, and Visual Basic are either registered trademarks or trademarks of
Microsoft Corporation in the United States and/or other countries.
•Adobe, Adobe Acrobat, and PostScript are trademarks or registered 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 product names are trademarks or registered trademarks of their respective
holders.
Revisions
1st Edition: June 2001
2nd Edition: August 2001
3rd Edition: December 2002
4th Edition: April 2004
4th Edition: April (YK)
All Rights Reserved, Copyright © 2001 Yokogawa Electric Corporation

ii IM 760101-11E
How to Use this Manual
Structure of this Manual
This User’s Manual consists of seven chapters, an Appendix and an Index as described
below.
Chapter 1 Overview of the GP-IB Interface
Describes the functions and specifications of GP-IB.
Chapter 2 Overview of the Serial Interface
Describes the functions and specifications of serial.
Chapter 3 Overview of the Ethernet Interface
Describes the functions and specifications of Ethernet.
Chapter 4 Before Programming
Describes formats used when sending a command.
Chapter 5 Command
Describes each command.
Chapter 6 Status Report
Describes the status byte, various registers and queues.
Chapter 7 Sample Programs
Sample programs, written in Visual Basic, for MS-DOS/V machines
equipped with the following GP-IB board: AT-GPIB/TNT IEEE-488.2, from
National Instruments.
Appendix
Contains references including the ASCII character code table.
Index
Provides an alphabetically ordered index.
Conventions Used in this Manual
•Symbols used for Notes and Keys
Type Symbol Description
Unit k1000 e.g.: 100 kS/s (sample rate)
K1024 e.g.: 640 KB (floppy disk memory capacity)
Note Note Provides information that is necessary for proper operation of the
instrument.
Key Communication Refers to a soft key displayed on the screen.
•Symbols used in syntax descriptions
Symbols which are used in the syntax descriptions in Chapter 5 are shown below.
These symbols are referred to as
Symbol Description Example Example of Input
<> Defined value ELEMent<x> <x>=1 to 6 -> ELEMENT2
{} One of the options in {} is selected. HCOPy:{TIFF|BMP} -> HCOPy:TIFF?
|Exclusive OR
[] Abbreviated CURSor[:TYPE] -> CURSor

iiiIM 760101-11E
Contents
Introduction ................................................................................................................................... i
How to Use this Manual ................................................................................................................ii
Chapter 1 Overview of the GP-IB Interface
1.1 Names of the Parts and Their Functions ....................................................................... 1-1
1.2 Connecting the GP-IB Cable ......................................................................................... 1-2
1.3 GP-IB Interface Functions ............................................................................................. 1-3
1.4 GP-IB Interface Specifications ....................................................................................... 1-4
1.5 Setting the Address........................................................................................................ 1-5
1.6 Response to Interface Messages .................................................................................. 1-6
Chapter 2 Overview of the Serial Interface
2.1 Names of the Parts and Their Functions ....................................................................... 2-1
2.2 Serial Interface Functions and Specifications ................................................................ 2-2
2.3 Connecting the Serial Interface Cable ........................................................................... 2-3
2.4 Handshaking .................................................................................................................. 2-5
2.5 Matching the Data Format ............................................................................................. 2-7
2.6 Setting Serial Communications...................................................................................... 2-8
Chapter 3 Overview of the Ethernet Interface
3.1 Names of the Parts and Their Functions ....................................................................... 3-1
3.2 Ethernet Interface Functions and Specifications ........................................................... 3-2
3.3 Connecting the WT to a PC ........................................................................................... 3-3
Chapter 4 Before Programming
4.1 Messages ...................................................................................................................... 4-1
4.2 Commands ..................................................................................................................... 4-3
4.3 Response ....................................................................................................................... 4-5
4.4 Data ............................................................................................................................... 4-5
4.5 Synchronization with the Controller ............................................................................... 4-7
Chapter 5 Commands
5.1 Command List................................................................................................................ 5-1
5.2 AOUTput Group ........................................................................................................... 5-12
5.3 COMMunicate Group ................................................................................................... 5-14
5.4 CURSor Group ............................................................................................................ 5-17
5.5 DISPlay Group ............................................................................................................. 5-20
5.6 FILE Group .................................................................................................................. 5-33
5.7 HARMonics Group ....................................................................................................... 5-38
5.8 HCOPy Group.............................................................................................................. 5-40
5.9 HOLD Group ................................................................................................................ 5-45
5.10 IMAGe Group ............................................................................................................... 5-45
5.11 INPut Group .................................................................................................................5-46
5.12 INTEGrate Group......................................................................................................... 5-54
5.13 MEASure Group .......................................................................................................... 5-58
5.14 MOTor Group ............................................................................................................... 5-62
5.15 NUMeric Group ............................................................................................................ 5-66
5.16 RATE Group ................................................................................................................ 5-73
5.17 STATus Group .............................................................................................................. 5-73
1
2
3
4
5
6
7
App
Index

iv IM 760101-11E
Contents
5.18 STORe Group .............................................................................................................. 5-75
5.19 SYSTem Group ............................................................................................................ 5-80
5.20 WAVeform Group ......................................................................................................... 5-83
5.21 WSETup (Wave SETup) Group ................................................................................... 5-85
5.22 Common Command Group.......................................................................................... 5-88
Chapter 6 Status Report
6.1 Overview of the Status Report ....................................................................................... 6-1
6.2 Status Byte..................................................................................................................... 6-2
6.3 Standard Event Register ................................................................................................ 6-3
6.4 Extended Event Register ............................................................................................... 6-4
6.5 Output Queue and Error Queue..................................................................................... 6-5
Chapter 7 Sample Program
7.1 Before Programming...................................................................................................... 7-1
7.2 Sample Program Image ................................................................................................. 7-2
7.3 Initialization, Error, and Functions for Execution............................................................ 7-3
7.4 Output of Normal Measurement Data ............................................................................ 7-6
7.5 Output of Harmonic Measurement Data ...................................................................... 7-10
7.6 Output of Waveform Data (ASCII Format) ................................................................... 7-14
7.7 Output of Waveform Data (FLOAT Format) ................................................................. 7-17
Appendix
Appendix 1 ASCII Character Code ....................................................................................App-1
Appendix 2 Error Messages ..............................................................................................App-2
Appendix 3 Overview of IEEE 488.2-1987 ........................................................................App-4
Index

Overview of the GP-IB Interface
1-1IM 7601010-11E
1
Chapter 1 Overview of the GP-IB Interface
1.1 Names of the Parts and Their Functions
Front Panel
LCD
R
E
S
E
T
S
E
L
E
C
T
DIGITAL POWER METER
INPUT
MOTOR SET
CAL
RANGE
FILTER
START STOP
SYNC
SRC
AVG MEASURE
SCALING
SINGLE STORE SET
REMOTE
MAX HOLD NULL
MENU
HARMONICS
TRIG'D
CURSOR
DISPLAY FILE
LOCAL
PUSH
MISC
SHIFT
COPY
STORE
WAVE
HOLD UPDATE
RATE
WIRING
INTEGRATOR
INTEG SET RESET
POWER
ESC
REMOTE indicator
Lit while remote mode is active via communications.
LOCAL key
Press this key to switch from remote
mode to local mode so as to enable
key operation.
MISC key
Press this key to set communication setting.
Rear Panel
GP-IB connector
Used to connect a controller (personal computer etc.) using a GP-IB cable.
For information on how to connect the GP-IB cable, refer to the following page.
(selected at the time of purchase)
EXT CLK
START
TXD
LINK
10Base-T
SCSI
or
GP-IB
(IEEE488) SERIAL (RS-232)
VIDEO-OUT
TORQUE
EXT
I
U
EXT
I
U
EXT
I
U
EXT
I
U
EXT
I
U
EXT
I
U
D/A OUTPUT
SPEED
(VGA)
STOP
654321

1-2 IM 760101-11E
1.2 Connecting the GP-IB Cable
GP-IB Cable
The GP-IB connector on the side panel of the PZ4000 is a 24-pin connector that
conforms to IEEE Standard 488-1978. Use a GP-IB cable that also conforms to IEEE
Standard 488-1978.
Connection Method
Connect the GP-IB cable as shown below.
Connection Precautions
• Be sure to tighten the screws on the GP-IB cable connector firmly.
•The instrument can be connected to more than one item of equipment (e.g. a personal
computer) if more than one GP-IB cable is used. However, it is not possible to
connect more than 15 items of equipment (including the controller) to a single bus.
•If you connect the instrument to more than one item of equipment, make sure that a
different address is used for each item.
• Each connecting cable must be 2 m or less in length.
•The total length of all the cables must not exceed 20 m.
•While communications are in progress, more than two-thirds of the connected
equipment items must be turned ON.
•When connecting more than one item of equipment, connect them so that the
connection route forms a star or linear configuration. Loop or parallel wiring is not
allowed.
CAUTION
Be sure to switch off power to both your PC and the oscilloscope before
connecting or disconnecting cables. Failure to switch power off may
cause internal circuit failure or improper operation.

Overview of the GP-IB Interface
1-3IM 7601010-11E
1
1.3 GP-IB Interface Functions
GP-IB Interface Functions
Listener function
•Allows you to make the settings which you can make using the panel keys on the
instrument, except for the power ON/OFF and GP-IB communications settings.
•Receives commands from a controller requesting output of set-up and waveform data.
Also receives status report commands.
Talker function
•Outputs set-up and waveform data.
Note
The talk-only, listen-only and controller functions are not available on this instrument.
Switching between Remote and Local Modes
When switched from Local to Remote Mode
Remote mode is activated when a REN (Remote Enable) message is received from a
controller while local mode is active.
•REMOTE is displayed on.
•All front panel keys except the LOCAL can no longer be operated any more.
•Settings entered in local mode are retained.
When switched from Remote to Local Mode
Pressing the LOCAL in remote mode puts the instrument in local mode. However, this is
not possible if Local Lockout has been set by the controller (page 1-6).
•The REMOTE indicator is turned off.
•All front panel keys are operative.
•Settings entered in remote mode are retained.

1-4 IM 760101-11E
1.4 GP-IB Interface Specifications
GP-IB Interface Specifications
Electrical and mechanical specifications : Conforms to IEEE Standard 488-1978.
Interface functions : Refer to the table below.
Protocol : Conforms to IEEE Standard 488.2-1987.
Code : ISO (ASCII) code
Mode : Addressable mode
Address setting : Addresses 0 to 30 can be selected from the
GP-IB setting screen, displayed when you
press the MISC.
Remote mode clear : Remote mode can be cleared by pressing the
LOCAL. However, this is not possible if Local
Lockout has been set by the controller.
Interface functions
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), no talk-only
capability
Listener L4 Basic listener capability, 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 poll PP0 No parallel polling capability
Device clear DC1 Full device clear capability
Device trigger DT1 Device trigger capability
Controller C0 No controller function
Electrical characteristic E1 Open collector

Overview of the GP-IB Interface
1-5IM 7601010-11E
1
1.5 Setting the Address
Keys
R
ES
E
T
S
E
L
E
C
T
INPUT
MOTOR SET
RANGE
FILTER
START STOP SYNC SRC
AVG
SCALING
SINGLE STORE SET
REMOTE
MAX HOLD N U L L
MENU
HARMONICS
TRIG'D
CURSOR
DISPLAY FILE
LOCAL MISC
SHIFT
COPYSTORE
WAVE
HOLD
UP DATE
RATE
WIRING
INTEGRATOR
INTEG SET RESET
To exit the menu during operation,
press ESC.
ESC
MEASURE
CAL
Procedure
1. Press MISC to display the Misc menu.
2. Press the Communicationsoft key.
3. Press the Comm Device soft key to display the GP-IB menu.
4. Turn the jog shuttleto set the address.
ESC ESC
Explanation
Carry out the following settings when using a controller to set information that can be
specified through key operation on the WT1600 or when outputting setting parameters or
output waveform display data to the controller.
Setting the Address
Set the address of the WT1600 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 WT1600 to a PC, for example, make sure to assign a unique address
to the WT1600.
Note
Do not change the address while the controller or other devices are using the GP-IB system.

1-6 IM 760101-11E
1.6 Response to Interface Messages
Response to Interface Messages
Response to a uni-line message
IFC (Interface Clear)
Clears the talker and listener. Stops output if data is being output.
REN (Remote Enable)
Switches between remote and local modes.
IDY (Identify) is not supported.
Response to a multi-line message (address command)
GTL (Go To Local)
Switches to local mode.
SDC (Selected Device Clear)
Clears the program message (command) which is currently being output. Also clears the
output queue (page 6-5).
*OPC and *OPC? will be disabled if they are currently being executed.
*WAI and COMMunicate:WAIT will be stopped immediately.
GET (Group Execute Trigger)
Operates in the sameway as the TRG command.
PPC (Parallel Poll Configure) and TCT (Take Control) are not supported
Response to a multi-line message (universal command)
LLO (Local Lockout)
Invalidates the LOCAL on the front panel to disable switching to local mode.
DCL (Device Clear)
Same as SDC
SPE (Serial Poll Enable)
Sets the talker function to serial poll mode for all equipment connected to the
communications bus. The controller performs polling on equipment sequentially.
SPD (Serial Poll Disable)
Clears serial poll mode as the talker function for all equipment connected to the
communications bus.
PPU (Parallel Poll Unconfigure) is not supported.
What is an Interface Message?
An interface message is also called an interface command or bus command, and is
issued by the controller. Interface messages are classified as follows.
Uni-line messages
Messages are transferred through a single control line. The following three types of uni-
line message are available.
IFC (Interface Clear)
REN (Remote Enable)
IDY (Identify)

Overview of the GP-IB Interface
1-7IM 7601010-11E
1
1.6 Response to Interface Messages
Multi-line message
Eight data lines are used to transmit a message. Multi-line messages are classified as
follows.
Address commands
Valid when the equipment is designated as a listener or a talker. The following five
address commands are available.
Commands valid for equipment designated as a listener
GTL (Go To Local)
SDC (Selected Device Clear)
PPC (Parallel Poll Configure)
GET (Group Execute Trigger)
Command valid for equipment designated as a talker
TCT (Take Control)
Universal commands
Valid for any item of equipment, irrespective of whether the item is designated as a
listener or a talker. The following five universal commands are available.
LLO (Local Lockout)
DCL (Device Clear)
PPU(Parallel Poll Unconfigure)
SPE (Serial Poll Enable)
SPD (Serial Poll Disable)
In addition to the above commands, a listener address, talker address on secondary
command can be sent in an interface message.
Interface Messages
Uni-line
Messages Address
command Universal command
★IFC
★REN
IDY ★GTL
★SDC
PPC
★GET
TCT
★LLO
★DCL
PPU
★SPE
★SPD
Listerner
address Talker address Secondary command
Multi-line Messages
Messages marked with a “★” are interface messages supported by the PZ4000
Note
Differences between SDC and DCL
The SDC command is an address command and requires that both the talker and listener be
designated; however DCL is a universal command and does not require that the talker and
listener be designated. Therefore, SDC is used for particular items of equipment, while DCL can
be used for any equipment connected to the communications bus.

Overview of the Serial Interface
2-1IM 760101-11E
2
Chapter 2 Overview of the Serial Interface
2.1 Names of the Parts and Their Functions
Front Panel
LCD
R
E
S
E
T
S
E
L
E
C
T
DIGITAL POWER METER
INPUT
MOTOR SET
CAL
RANGE
FILTER
START STOP
SYNC
SRC
AVG MEASURE
SCALING
SINGLE STORE SET
REMOTE
MAX HOLD NULL
MENU
HARMONICS
TRIG'D
CURSOR
DISPLAY FILE
LOCAL
PUSH
MISC
SHIFT
COPY
STORE
WAVE
HOLD UPDATE
RATE
WIRING
INTEGRATOR
INTEG SET RESET
POWER
ESC
REMOTE indicator
Lit while remote mode is active via communications.
LOCAL key
Press this key to switch from remote
mode to local mode so as to enable
key operation.
MISC key
Press this key to set communication setting.
Rear Panel
Serial (RS-232) connector
Complies with EIA-574 Standard (EIA-232 (RS-232) Standard for 9 pin)
Used to connect a controller (personal computer etc.) using a serial cable.
(selected at the time of purchase)
EXT CLK
START
TXD
LINK
10Base-T
SCSI
or
GP-IB
(IEEE488) SERIAL (RS-232)
VIDEO-OUT
TORQUE
EXT
I
U
EXT
I
U
EXT
I
U
EXT
I
U
EXT
I
U
EXT
I
U
D/A OUTPUT
SPEED
(VGA)
STOP
654321

2-2 IM 760101-11E
2.2 Serial Interface Functions and Specifications
Receiving Function
It is possible to make the same settings via the serial interface as can be made using the
front panel keys.
Measured/computed data, panel set-up information and error codes can be received.
Sending Function
Measured/computed data can be output.
Panel set-up information and the status byte can be output.
Error codes which have occurred can be output.
Serial Interface Specifications
Electrical characteristics : Complies with EIA-574 Standard (EIA-232 (RS-232) Standard
for 9 pin)
Connection : Point-to-point
Communications : Full-duplex
Synchronization : Start-stop system
Baud rate : 1200, 2400, 4800, 9600, 19200
Start bit : 1 bit (fixed)
Data Length : 7 or 8 bits
Parity : Even, odd or no parity
Stop Bit : 1 or 2 bits
Connector : DELC-J9PAF-13L6 (JAE or equivalent)
Hardware handshaking : User can select whether CA or CB signals will always be True,
or will be used for control.
Software Handshaking : User can select whether to control only transmission or both
transmission and reception using X-on and X-off signals.
X-on (ASCII 11H)
X-off (ASCII 13H)
Receive : 256 bytes
Switching between Remote and Local Modes
When switched from Local to Remote Mode
Remote mode is activated when the “COMMunicate:REMote ON” command is received
form a controller while local mode is active.
•REMOTE is displayed on.
•All front panel keys except the LOCAL can no longer be operated any more.
•Settings entered in local mode are retained.
When switched from Remote to Local Mode
Pressing the LOCAL in remote mode puts the instrument in local mode. However, this
is not possible of Local Lockout (when the “COMMunicate:LOCKout ON” command is
received) has been set by the controller (page 1-6).
Local mode is activated when the “COMMunicate:REMote OFF” command regardless of
Local Lockout.
•The REMOTE indicator is turned off.
•All front panel keys are operative.
•Settings entered in remote mode are retained.

Overview of the Serial Interface
2-3IM 760101-11E
2
2.3 Connecting the Serial Interface Cable
When connecting this instrument to a computer, make sure that the handshaking
method, data transmission rate and data format selected for the instrument match those
selected for the computer.
For details, refer to the following pages. Also make sure that the correct interface cable
is used.
Connector and Signal Names
2
1
3
4
5
6
7
8
9
2. RD (Received Data) : Data received from personal computer
Signal direction...Input
3. SD (Send Data) : Data transmitted to a personal computer
Signal direction...Output
5. SG (Signal Ground) : Ground for signals
7. RS (Request to Send): Signal used for handshaking when receiving data from a
personal computer
Signal direction...Output
8. CS (Clear to Send) : Signal used for handshaking when transmitting data to a
personal computer
Signal direction...Input
Pin Nos. 1, 4, 6 and 9 are not used.
9-25 Pin Connector
58723
(2) (3)(4) (5) (7)
The number between brackets refer to the pin Nos. of the 25-pin connector.
Signal Direction
The figure below shows the direction of the signals used by the Serial interface.
Computer This
instrument
RS [Request to send]
SD [Send data]
RD [Receive data]
2
3
8
7
CS [Clear to send]

2-4 IM 760101-11E
2.3 Connecting the Serial Interface Cable
Table of Serial Standard Signals and their
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 line connection example
The pin numbers shown are that of 9-pin connectors.
In general, use a cross cable.
SD
RD
RS
CS
SG
SD
RD
RS
SG
• OFF-OFF / XON-XON
PC PZ4000
SD
RD
RS
CS
SG
SD
RD
RS
SG
• XON-RTS(XON-RS)
PC PZ4000
SD
RD
RS
CS
SG
SD
RD
RS
SG
• CTS-RTS(CS-RS)
PC PZ4000
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

Overview of the Serial Interface
2-5IM 760101-11E
2
2.4 Handshaking
To use an serial interface for transferring data between this instrument and a computer, it
is necessary to use certain procedures by mutual agreement to ensure the proper
transfer of data. These procedures are called “handshaking.” Various handshaking
systems are available depending on the computer to be used; the same handshaking
system must be used for both the computer and this instrument.
This instrument allows you to choose any handshaking mode from the following four
modes.
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
1 OFF-OFF
•Transmission data control
There is no handshake status between the instrument and host computer. The X-OFF
and X-ON signal from the host computer is processed as data, and the CS signal is
ignored.
•Reception data control
There is no handshake status between the recorder and host computer. When the
recorder reception buffer becomes full, the excess data is discarded. RS = True (fixed)
2 XON-XON
•Transmission data control
A software handshake status is established between the instrument and host
computer. The instrument will stop a data transmission when an X-OFF signal is
received from the host computer, and will resume transmission when the next X-ON
signal is received. A CS signal from the host computer is ignored.
•Reception data control
A software handshake status is established between the instrument and host
computer. When the intstruments reception buffer vacancy reaches 64bytes, the X-
OFF signal will be sent to the host computer. When the reception buffer vacancy
reaches 192 bytes, the X-ON signal will be sent. RS = True (fixed)

2-6 IM 760101-11E
2.4 Handshaking
3 XON-RS
•Transmission data control
A software handshake status is established between the instrument and host
computer. The instrument will stop a data transmission when an X-OFF signal is
received from the host computer, and will resume transmission when the next X-ON
signal is received. A CS signal from the host computer is ignored.
•Reception data control
A hardware handshake status is established between the instrument and host
computer. When the intstruments reception buffer vacancy reaches 64bytes, an “RS =
False” status will be established. When the reception buffer vacancy reaches 192
bytes, an “RS = True” status will be established.
4 CS-RS
•Transmission data control
A software handshake status is established between the instrument and host
computer. The instrument will stop a data transmission if a “CS = False” status is
established, and will resume the transmission shen a “CS = True” status is
established. The X-OFF and X-ON signals from the host computer are processed as
data.
•Reception data control
A hardware handshake status is established between the instrument and host
computer. When the intstruments reception buffer vacancy reaches 64bytes, an “RS =
False” status will be established. When the reception buffer vacancy reaches 192
bytes, an “RS = True” status will be established.
Precautions Regarding Data Receiving Control
When handshaking is used to control the reception of data, data may still be sent from
the computer 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
handshaking is in effect or not. Data storage to the buffer will begin again 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
It is necessary to create a host computer program which prevents the buffers of both the
intrument and the computer from becoming full.

Overview of the Serial Interface
2-7IM 760101-11E
2
2.5 Matching the Data Format
The serial interface of this instrument performs communications using start-stop
synchronization. In start-stop synchronization, one character is transmitted at a time.
Each character consists of a start bit, data bits, a parity bit and a stop bit. Refer to the
figure below.
Data bit
(7 or 8 bits)
1 character
Stop bit
1
1 or 2 bits
2
Parity bit
Even, odd or none
Start bit
Circuit idle state
Level returns to idle
state (dotted line)
until the start bit of
the next item of data
(solid line).

2-8 IM 760101-11E
2.6 Setting Serial Communications
Keys
R
ES
E
T
S
E
L
E
C
T
INPUT
MOTOR SET
RANGE
FILTER
START STOP SYNC SRC
AVG
SCALING
SINGLE STORE SET
REMOTE
MAX HOLD N U L L
MENU
HARMONICS
TRIG'D
CURSOR
DISPLAY FILE
LOCAL MISC
SHIFT
COPYSTORE
WAVE
HOLD
UP DATE
RATE
WIRING
INTEGRATOR
INTEG SET RESET
To exit the menu during operation,
press ESC.
ESC
MEASURE
CAL
Procedure
Displaying the Serial Communication (RS-232) Menu
1. Press MISC to display the Misc menu.
2. Press the Communicationsoft key.
3. Press the Comm Device soft key to display the RS-232 menu.
Selecting the Baud Rate, Data Format, and Other Parameters
4. Press the Baud Rate, Format, Rx-Tx (handshaking method), and Terminator
soft keys and select each item.
ESC ESC