YOKOGAWA AQ6370C User manual

User’s
Manual AQ6370C/AQ6373/AQ6375
Optical Spectrum Analyzer
Remote Control
IM AQ6370C-17EN
3rd Edition

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IM AQ6370C-17EN
Foreword
Thank you for purchasing the AQ6370C/AQ6373/AQ6375 Optical Spectrum Analyzer.
This remote control user’s manual covers the AQ6370C, AQ6373 and AQ6375.
It describes the following.
•GP-IB Interface
•RS-232 Interface
• Ethernet Interface and Communication Commands
• Program Functions
To ensure correct use, please read this manual thoroughly before beginning operation.
After reading this manual, keep it in a convenient location for quick reference in the event
a question arises during operation. In addition to this manual, there is one individual
manual each for the AQ6370C, AQ6373 and AQ6375. Read them along with this manual.
AQ6370C
Manual Title Manual No. Description
AQ6370C
Optical Spectrum Analyzer
User’s Manual
IM AQ6370C-01EN The manual is located on the CD included in
your package (pdf format). Explains all functions
and operating procedures of the AQ6370C
except remote control and program functions.
AQ6370C
Optical Spectrum Analyzer
Getting Started Guide
IM AQ6370C-02EN Explains the handling precautions, installation
procedure, component names, and
specifications of the AQ6370C.
AQ6373
Manual Title Manual No. Description
AQ6373
Optical Spectrum Analyzer
User’s Manual
IM AQ6373--01EN The manual is located on the CD included in
your package (pdf format). Explains all functions
and operating procedures of the AQ6373 except
remote control and program functions.
AQ6373
Optical Spectrum Analyzer
Getting Started Guide
IM AQ6373-02EN Explains the handling precautions, installation
procedure, component names, and
specifications of the AQ6373.
AQ6375
Manual Title Manual No. Description
AQ6375
Optical Spectrum Analyzer
User’s Manual
IM AQ6375-01EN The manual is located on the CD included in
your package (pdf format). Explains all functions
and operating procedures of the AQ6375 except
remote control and program functions.
AQ6375
Optical Spectrum Analyzer
Getting Started Guide
IM AQ6375-02EN Explains the handling precautions, installation
procedure, component names, and
specifications of the AQ6375.
Notes
• The contents of this manual are subject to change without prior notice as a result
of improvements in the instrument’s performance and functions. Display contents
illustrated in this manual may differ slightly from what actually appears 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 Meters&Instruments Corporation is strictly prohibited.
3rd Edition: October 2011 (YMI)
All Rights Reserved, Copyright © 2010 Yokogawa Meters & Instruments Corporation

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Trademarks
• Microsoft and Windows are registered trademarks or trademarks of Microsoft
Corporation in the United States and/or other countries.
• Adobe and Acrobat are registered trademarks or trademarks of Adobe Systems
incorporated.
• The company and product names used in this manual are not accompanied by the
registered trademark or trademark symbols (® and TM).
• Other company and product names are registered trademarks or trademarks of their
respective companies.
Revisions
• 1st Edition September, 2010
• 2nd Edition January, 2011
• 3rd Edition October, 2011
Foreword

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Safety Precautions
This instrument is an IEC protection class I instrument (provided with terminal for
protective earth grounding).
The general safety precautions described herein must be observed during all phases
of operation. If the instrument is used in a manner not specified in this manual, the
protection provided by the instrument may be impaired. Yokogawa Electric Corporation
assumes no liability for the customer’s failure to comply with these requirements.
The following safety symbols and wording is used in this manual.
Warning: Handle with care. Refer to the user’s manual or service manual.
This symbol appears on dangerous locations on the instrument which require
special instructions for proper handling or use. The same symbol appears in the
corresponding place in the manual to identify those instructions.
Alternating current
ON (power)
OFF (power)

iv IM AQ6370C-17EN
Conventions Used in This Manual
Safety Markings
The following safety markings are used in this manual.
Improper handling or use can lead to injury to the user or damage
to the instrument. This symbol appears on the instrument to indicate
that the user must refer to the users manual for special instructions.
The same symbol appears in the corresponding place in the user’
s manual to identify those instructions. In the manual, the symbol is
used in conjunction with the word “WARNING” or “CAUTION.”
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 damage to the instrument or user’s data, and precautions
that can be taken to prevent such occurrences.
Note Calls attention to information that is important for proper operation of
the instrument.
Notations Used in the Procedural Explanations
On pages that describe the operating procedures in each chapter, the following notations
are used to distinguish the procedure from their explanations.
Procedure This subsection contains the operating procedure used to carry out
the function described in the current section. The 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.
Terms Used in Explanations of Procedures
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 displayed on the screen menu.
SHIFT+Panel Key
SHIFT+key means you will press the SHIFT key to turn it ON and then press the panel key. The
setup menu marked in purple below the panel key that you pressed appears on screen.
Units
k Denotes 1000. Example: 12 kg, 100 kHz
K Denotes 1024. Example: 459 KB (file size)

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How To Use This Manual
Structure of This Manual
This user’s manual consists of the following eight chapters, an appendix, and an index.
Chapter 1 Remote Control Functions
This section describes the various types of communication interfaces and program
functions.
Chapter 2 GP-IB Interface (GP-IB1 Port)
Describes the functions and lists the specifications of the GP-IB1 port.
Chapter 3 Ethernet Interface
Describes the functions and lists the specifications of the Ethernet interface.
Chapter 4 Serial (RS-232) Interface
Describes the functions and lists the specifications of the RS-232 interface.
Chapter 5 GP-IB Interface (GP-IB2 Port)
Describes the functions and lists the specifications of the GP-IB2 port.
Chapter 6 Status Registers
Explains the status byte and describes the various kinds of registers, cues, and other
items.
Chapter 7 Remote Commands
Describes each individual command that can be used.
Chapter 8 Program Function
Explains the program function for controlling another instrument using the AQ6370C/
AQ6373/AQ6375 as the controller.
Appendix
Lists commands that are compatible with the AQ6317.
Index
An alphabetical index.

vi IM AQ6370C-17EN
Contents
Safety Precautions........................................................................................................................... iii
Conventions Used in This Manual ...................................................................................................iv
How To Use This Manual ..................................................................................................................v
Chapter 1 Remote Control Functions
1.1 Remote Interfaces ............................................................................................................ 1-1
1.2 Switching between Local and Remote ............................................................................. 1-2
1.3 Sending/Receiving Remote Commands .......................................................................... 1-3
Chapter 2 GP-IB Interface (GP-IB1 Port)
2.1 Connecting via GP-IB....................................................................................................... 2-1
2.2 GP-IB Interface Function.................................................................................................. 2-3
2.3 GP-IBInterfaceSpecications ......................................................................................... 2-4
2.4 Setting the GP-IB Address ............................................................................................... 2-5
2.5 Responses to Interface Messages ................................................................................... 2-7
2.6 Sample Program .............................................................................................................. 2-9
Chapter 3 Ethernet Interface
3.1 Connecting via Ethernet ................................................................................................... 3-1
3.2 Setting Up Ethernet .......................................................................................................... 3-2
3.3 Sample Program .............................................................................................................. 3-6
Chapter 4 Serial (RS-232) Interface
4.1 Connecting via the Serial (RS-232) Interface .................................................................. 4-1
4.2 Remote Control Using Commands................................................................................... 4-4
4.3 Setting Up RS-232 ........................................................................................................... 4-5
Chapter 5 GP-IB Interface (GP-IB2 Port )
5.1 Connecting via GP-IB2..................................................................................................... 5-1
5.2 GP-IBInterfaceSpecications ......................................................................................... 5-2
5.3 Setting the GP-IB Address ............................................................................................... 5-3
Chapter 6 Status Registers
6.1 Status Registers ............................................................................................................... 6-1
6.2 Status Byte Registers....................................................................................................... 6-3
6.3 Standard Event Status Registers ..................................................................................... 6-5
6.4 Operation Status Registers .............................................................................................. 6-7
6.5 Questionable Status Registers....................................................................................... 6-10
Chapter 7 Remote Commands
7.1 Rules of Syntax and Command Types ............................................................................. 7-1
7.2 Table of Correspondence between Soft Keys and Remote Commands .......................... 7-4
7.3 ANALYSIS Setting Parameters ...................................................................................... 7-17
7.4 Remote Command Tree ................................................................................................. 7-26
7.5 Common Commands ..................................................................................................... 7-33
7.6 Instrument-SpecicCommands ..................................................................................... 7-36
ABORt Sub System Command .............................................................................. 7-36
CALCulate Sub System Command ........................................................................ 7-36
CALibration Sub System Command....................................................................... 7-55

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Contents
DISPlay Sub System Command............................................................................. 7-56
FORMat Sub System Command............................................................................ 7-62
HCOPY Sub System Command............................................................................. 7-62
INITiate Sub System Command ............................................................................. 7-63
MEMory Sub System Command ............................................................................ 7-63
MMEMory Sub System Command ......................................................................... 7-64
PROGram Sub System Command......................................................................... 7-67
SENSe Sub System Command.............................................................................. 7-68
STATus Sub System Command ............................................................................. 7-71
SYStem Sub System Command ............................................................................ 7-72
TRACe Sub System Command.............................................................................. 7-76
TRIGger Sub System Command............................................................................ 7-80
UNIT Sub System Command ................................................................................. 7-81
7.7 Output Format for Analysis Results................................................................................ 7-82
Chapter 8 Program Function
8.1 Editing a Program............................................................................................................. 8-1
8.2 Executing a Program........................................................................................................ 8-9
8.3 Program Function Commands ....................................................................................... 8-15
8.4 Controlling an External Instrument with the Program Function ...................................... 8-55
8.5 Sample Program ............................................................................................................ 8-57
Appendix AQ6317-Compatible GP-IB Commands
Switching Command Modes .....................................................................................................App-1
AQ6317 Status Byte ................................................................................................................. App-3
List of the AQ6317-Compatible Commands.............................................................................. App-4
HIGH1, HIGH2, HIGH3 of Measurement Sensitivity .............................................................. App-17
Index

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Remote Control Functions
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Index
1.1 Remote Interfaces
This instrument is equipped with the following remote interfaces.
GP-IB1 (IEEE 488.2, See Chapter 2)
This port is used to connect a controller such as a PC to remote control this instrument.
Connect a controller or another device controlled by the controller to this port.
This instrument is controlled using remote commands.
Two types of remote commands are provided: the instrument’s native commands
complying with SCPI (Standard Commands for Programmable Instruments), and
commands compatible with the conventional model AQ6317 (see the appendix).
GP-IB2 (IEEE 488.1, See Chapter 5)
The instrument acts as a controller for remote control of external instruments. Connect to
the external device to be controlled using the instrument’s program function.
RS-232 (See Chapter 3)
This port is used to connect a controller such as a PC to control the instrument remotely.
Ethernet (See Chapter 4)
This port is used to connect a controller such as a PC to control the instrument remotely
via network.
GP-IB1 and GP-IB2 Ports
The GP-IB1 and GP-IB2 ports must be used differently for different purposes.
The GP-IB1 port is used when controlling the instrument from a PC.
The GP-IB2 port is used when controlling an external instrument from the AQ6370C/
AQ6373/AQ6375.
Therefore, please note the following.
•A controller such as a PC that is connected to the GP-IB2 port cannot remotely control
the AQ6370C/AQ6373/AQ6375.
• Even if a turnable laser source or an external device to be controlled by the AQ6370C/
AQ6373/AQ6375 using program functions is connected to the GP-IB1 port, it cannot
remote control the AQ6370C/AQ6373/AQ6375.
• The GP-IB1 and GP-IB2 ports are independent of each other. Thus, a controller
connected to the GP-IB1 port cannot directly send a message to an external device
connected to the GP-IB2 port.
• When a PC or other controller is connected to the GP-IB1 port, connecting the GP-IB1
port with the GP-IB2 port results in improper operation.
Do not connect these ports together, or turn OFF the system controller function.
The default is ON.
Chapter 1 Remote Control Functions

1-2 IM AQ6370C-17EN
1.2 Switching between Local and Remote
Switching from Local to Remote
When in Local mode, if a listen address is sent from the controller that sets REN (remote
enable) and ATN to “True,” the instrument enters Remote mode.
• When in Remote mode, the REMOTE indicator lights.
•Keys other than the LOCAL key are disabled.
• Settings entered in Local mode are held even if switching to Remote mode.
• When an LLO (Local Lock Out) message is received from the controller, the
instrument enters local lockout status. In LLO status, the LOCAL key is disabled and
does not return the instrument to Local mode even when pressed. After cancelling the
local lockout status, press the LOCAL key. To cancel the local lockout status, set REN
to “False” from the controller.
Switching from Remote to Local
If you press the LOCAL key when in Remote mode the instrument enters Local mode.
However, it does not return to Local mode if in the local lockout state.
• The REMOTE indicator turns off.
• All keys are enabled.
• Settings entered in Remote mode are held even if switching to Local mode.
• When a GTL (Go to Local) message is received from the controller, the instrument
enters Local mode even if REN is set to False.

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Remote Control Functions
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Index
1.3 Sending/Receiving Remote Commands
Buffers
Input Buffer
The instrument’s input buffer is a single stage 1 MB buffer. When receiving data that
exceeds the buffer size, the data after the first megabyte is discarded. The remote
command after the last command separator of the 1 MB of data is deleted.
Output Buffer
The instrument’s output buffer is a single stage 1 MB buffer. Only the most recent data is
held. (When a talker command is received while there is data in the buffer, the old data in
the buffer is replaced with the incoming data.) When talker commands are combined and
executed resulting in generation of talker data that exceeds the buffer size, the following
process is carried out.
•The query error bit (QYE) of the standard event status register is set to 1.
• The talker output buffer is cleared.
• Commands received even after the buffer overflow are processed. Note, however, that
talker data by talker commands is not stored at the output buffer.
Error Buffer
This instrument’s error buffer is of a single stage and stores only the latest error information.
Message Terminators
This instrument allows the following message terminators to be used.
Program Message Terminators
• Assertion of EOI (End-Of-Identify) signal
• LF (line feed) character
• LF+EOI
Here, LF is a line feed (0Ah) in ASCII. For CR + LF, because CR (0Dh) is recognized
as “wsp,” CR + LF can consequently also be used as a message terminator. Also, for
waveform binary transfer, only EOI is used as a message terminator.
Response Message Terminator
LF+EOI is used as the response message terminator.
Receiving Remote Commands
• When completing receipt of a remote command, the instrument releases the GP-IB
bus.
• When receiving the next command while a command action is being executed, the
instrument captures that command to store it in the receive buffer, and then releases
the GP-IB bus.
• When there is a remote command in the receive buffer, the instrument does not
capture a successive command even if there are commands on the GP-IB bus.
• When the action of the preceding command is complete, the instrument executes the
command stored in the receive buffer and clears the buffer. Then it captures the next
command into the receive buffer if there is one on the bus.
• When an output statement contains multiple remote commands, this instrument
captures them all and services them in the order they were written. In this case, unless
the last command in the statement has started to be executed, this instrument cannot
capture the next command.

1-4 IM AQ6370C-17EN
Data Inquiry
• Inquiry of data by the external controller is made using a query command or a data
output request from the controller.
• Query commands end with a question mark (?).
•For query commands with an argument, the argument is specified in the form of
<wsp> + <argument> at the end of the “?”.
• When a query command is received, the instrument prepares a reply to the query
command in the output buffer.
• Data in the output buffer will be retained until the instrument receives an input
statement or a new query command from the controller.
• If multiple query commands are specified and written in succession using a semicolon
“;”, the instrument prepares replies to all of them in the output buffer. In this case, the
instrument will collectively output all of the prepared data when receiving the next data
output request.
Setting the timeout time
A timeout time setting of 30 seconds or more is recommended.
At approximately 10 minute intervals, the instrument performs an auto offset for
approximately 30 seconds. The communication timeout of the external controller should
be set to 30 seconds or more so that a timeout does not occur during the execution of
the offset. See the user’s manual of your remote interface card for instructions on how to
set the communication timeout time.
The instrument's auto offset function is set to ON by default, and it performs offset of the
analog circuits at approximately 10 minute intervals. The offset process takes about 30
seconds. On the AQ6373 and AQ6375, during this offset process, the receiving of remote
commands, execution of remote commands, and talker data transmission processes
are suspended. If an external controller sends a remote command or requests output
of talker data while the suspension is in effect, the external controller may experience
a communication timeout error because the instrument cannot perform the requested
action until the offset process is complete.
If you do not want to set the communication timeout to 30 seconds or less
To avoid remote malfunctions due to communication timeouts, offset processing can be
performed manually. Turn the auto offset function OFF in advance, and perform the offset
manually during a gap in measurement sequences. Wait approximately 30 seconds
until the offset process is finished. After the offset is complete, restart the measurement
sequence.
The remote commands are as follows.
Turn OFF the auto offset function :CALibration:ZERO off
Perform a manual offset :CALibration:ZERO once
Note
• An offset interval of 10 minutes is recommended.
• If the AUTO OFFSET key is OFF, the offset can fluctuate over time, and the level axis
performance can degrade. Always have it turned ON.
• When the AUTO OFFSET key is set to ON, is displayed at the bottom of the screen.
Device Trigger Function
When GET (Group Execute Trigger) is received, the instrument will perform a single
sweep.
1.3 Sending/Receiving Remote Commands

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GP-IB Interface (GP-IB1 Port)
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Index
2.1 Connecting via GP-IB
GP-IB Cable
This instrument is equipped with an IEEE standard 488-1978 24-pin GP-IB connector.
Use a GP-IB cable that conforms to the IEEE standard 488-1978.
Connections
The instrument has two ports, GP-IB1 and GP-IB2.
GP-IB1 port: Can be connected to a PC for remote control of the instrument from the
PC.
GP-IB2 port: Can be connected to another instrument for remote control of that
instrument using the AQ6370C/AQ6373/AQ6375’s program function.
For now, you will connect a PC to the GP-IB1 port.
Turn OFF all the power switches of the AQ6370C/AQ6373/AQ6375 and any devices
to be connected to it. Connect a cable to the GP-IB1 port on the rear panel of the
instrument.
CAUTION
Always turn OFF the power to the instrument and the PC when connecting or
disconnecting communication cables. Failure to turn OFF the power can result in
malfunction or damage to internal circuitry.
GP-IB1
GP-IB2
Precautions When Making Connections
• Securely fasten the screw that is attached to the GP-IB cable connector.
• You can connect several cables to connect to several devices. However, fifteen or
more devices including the controller cannot be connected to a single bus.
• When connecting several devices, you cannot specify the same address for more than
one.
• Use a cable of two meters or longer to connect between devices.
• Ensure that the total length in cables does not exceed twenty meters.
• When carrying out communications, make sure that at least two-thirds of all connected
devices are turned ON.
Chapter 2 GP-IB Interface (GP-IB1 Port)

2-2 IM AQ6370C-17EN
• When connecting multiple devices, use a star or linear configuration as shown in the
figure below. A loop or parallel configuration cannot be used.
2.1 Connecting via GP-IB

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GP-IB Interface (GP-IB1 Port)
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Index
2.2 GP-IB Interface Function
GP-IB Interface Function
Listener Function
• All of the same settings can be performed using the interface (except for power ON/
OFF and communication settings) as when using the instrument’s panel keys.
• Settings, waveforms, and other data can be received through output commands from
the controller.
• Additionally, you can also receive commands regarding status reports and other data.
Talker Function
• Settings, waveforms, and other data can be output.
Note
Listen only, talk only, and controller functions are not available.
Switching between Remote and Local
Switching from Local to Remote
When in Local mode, if the instrument received a listen address from the controller that
sets REN (remote enable) and ATN to “True,” the instrument enters Remote mode.
• When in Remote mode, the REMOTE indicator lights.
•Keys other than the LOCAL key are disabled.
• Settings entered in Local mode are held even if switching to Remote mode.
• When an LLO (Local Lock Out) message is received from the controller, the
instrument enters local lockout status. In LLO status, the LOCAL key is disabled and
does not return this instrument to Local mode even when pressed. After cancelling the
local lockout status, press the LOCAL key. To cancel the local lockout status, set REN
to "False" from the controller.
Switching from Remote to Local
If you press the LOCAL key when in Remote mode the instrument enters Local mode.
However, it does not return to Local mode if in the local lockout state.
• The REMOTE indicator turns off.
• All keys are enabled.
• Settings entered in Remote mode are held even if switching to Local mode.
• When a GTL (Go to Local) message is received from the controller, the instrument
enters Local mode even if REN is set to False.
Note
The GP-IB interface cannot be used simultaneously with other communication interfaces
(RS-232, USB, or Ethernet).

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2.3 GP-IB Interface Specifications
GP-IB Interface Specifications
Electromechanical specifications: Conforms to IEEE std. 488-1978
Functional specifications: See table below
Protocols: Conforms to IEEE std. 488.2-1992
Encoding: ISO (ASCII)
Mode: Addressable mode
Address setting: Addresses 0-30 can be set in the GP-IB setting
screen in the SYSTEM menu.
Remote mode cancel: Press LOCAL to cancel Remote mode. Note that
this is disabled when under Local Lockout by the
controller.
Functional Specifications
Function Subset Description
Source handshake SH1 All capabilities of send handshake
Acceptor handshake AH1 All capabilities of receive handshake
Talker T6 Basic talker function, serial polling, and talker
cancel function through MLA (my listen address).
Talker only not provided.
Listener L4 Basic listener function, serial polling, and listener
cancel function through MLA (my listen address).
Listener only not provided.
Service request SR1 All service request functions
Remote local RL1 All Remote/Local functions
Parallel port PP0 Parallel polling function not provided
Device clear DC1 All device clear functions
Output buffer clear
Input buffer clear (clearing of an unexecuted
commands)
Error buffer clear
STB, ESR clear
Device trigger DT0 Device trigger function
Controller C0 Controller function not provided
Electrical characteristics E1 Open collector

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GP-IB Interface (GP-IB1 Port)
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Index
2.4 Setting the GP-IB Address
Procedure
Selecting the Communication Interface
1.
Press SYSTEM. The system setting menu is displayed.
2.
Press the MORE1/4 soft key. The communication interface setting menu is
displayed.
3.
Press the REMOTE INTERFACE soft key. The setting menu for the interface to
be used is displayed.
4.
Press the GP-IB soft key to specify GP-IB as the communication interface.
Setting the Address
5.
Press the GP-IB SETTING soft key. The GP-IB setting menu is displayed.
6.
Press the MY ADDRESS soft key. The GP-IB address setting screen is displayed.
7.
Set the GP-IB address using the rotary knob or the arrow keys, and press
ENTER.
GP-IB address setting
See chapter 5
Command format
See chapter 5
See chapter 5

2-6 IM AQ6370C-17EN
Setting the Command Format
8.
Perform these steps if you will use AQ6370C/AQ6373/AQ6375 commands.
Press the COMMAND FORMAT soft key. The command format setting menu is
displayed.
9.
Normally, you will enter AQ6370C, AQ6373 or AQ6375. If you wish to use AQ6317
commands, enter AQ6317.
Explanation
The settings below are used when entering the settings that can be entered using the
instrument’s panel keys from a controller, or when outputting settings or waveform data
to the controller.
GP-IB Address Settings
When in Addressable mode, set the instrument’s address within the following range.
0–30
Each device that can be connected via GP-IB has its own unique GP-IB address. This
address allows each device to be distinguished from other devices. Therefore, when
connecting the instrument to a PC or other device, make sure not to set the same
address on the instrument as any of the other devices.
Note
• Do not change an address while the controller or other devices are using GP-IB.
• Set addresses other than those used by the GP-IB2 port.
Command Format Settings
Normally, you will enter AQ6370C, AQ6373 or AQ6375 mode.
If you wish to use the commands of the AQ6317 (another product in the series),
enter AQ6317. See the appendix for AQ6317 commands that are compatible with the
AQ6370C/AQ6373/AQ6375.
Note
Controller functions and TLS address settings are entered when controlling an external device
using the GP-IB2 port. These settings are invalid for the GP-IB1 port.
2.4 Setting the GP-IB Address

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GP-IB Interface (GP-IB1 Port)
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2.5 Responses to Interface Messages
Responses to Interface Messages
Responses to Uniline Messages
IFC (Interface Clear)
Clears talker and listener. Output is cancelled if outputting data.
REN (Remote Enable)
Switches between Local and Remote.
IDY (Identify) is not supported.
Responses to Multiline Messages (Address Commands)
GTL (Go To Local)
Switches to Local mode.
SDC (Selected Device Clear)
• Clears program messages (commands) being received, and the output queue.
• The *OPC and *OPC? commands are invalid during execution.
• The *WAI command closes immediately.
PPC (parallel poll configure), GET (group execute trigger), and TCT (take control) are not
supported.
Responses to Multiline Messages (Universal Commands)
LLO (Local Lockout)
Disables the front panel SHIFT+CLEAR operation, and prohibits switching to Local
mode.
DCL (Device Clear)
Same operation as SDC.
SPE (Serial Poll Enable)
Places the talker function of all devices on the bus in Serial poll mode. The controller
polls each device in order.
SPD (Serial Poll Disable)
Cancels Serial poll mode for the talker function of all devices on the bus.
PPU (Parallel Poll Unconfigure) is not supported.
Definition of Interface Messages
Interface messages are also called interface commands or bus commands, and are
commands that are issued from the controller. Interface messages come in the following
categories.
Uniline Messages
A message is sent through a single command line. The following are the three types of
uniline messages.
IFC (Interface Clear)
REN (Remote Enable)
IDY (Identify)

2-8 IM AQ6370C-17EN
Multiline Messages
A message is sent through eight data lines. Multiline messages come in the following
categories.
Address Commands
These commands are valid when the device is specified as the listener or the talker.
The following are the five types of address commands.
Commands valid for devices specified as listeners
GTL (Go To Local)
SDC (Selected Device Clear)
PPC (Parallel Poll Configure)
GET (Group Execute Trigger)
Commands valid for devices specified as talkers
TCT (Take Control)
Universal Commands
These commands are valid for all devices regardless of whether they are specified as
listeners, talkers, or neither. The following are the three types of universal commands.
LLO (Local Lockout)
DCL (Device Clear)
PPU (Parallel)
Additionally, an interface message can consist of a listener address, talker address, or
secondary command.
Interface Messages
Uniline
messages Address
commands
Universal
commands
IFC
REN
IDY GTL
SDC
PPC
GET
TCT
LLO
DCL
PPU
SPE
SPD
Listener
address
Talker
address
Secondary
command
Multiline messages
A star indicates an interface message supported by this instrument.
Note
Differences between SDC and DCL
Of the multiline messages, SDC is an address command requires specification of the talker
or listener, and DCL is a universal command that does not require specification of the talker
or listener. Therefore, SDC is applicable only to certain devices, but DCL is applicable to all
devices on the bus.
2.5 Responses to Interface Messages