R&S AFQ100A Owner's manual

R&S®AFQ100A, R&S®AFQ100B
I/Q Modulation Generator
Supplement
The following description relates to the Operating Manuals of the R&S®AFQ100A, and the
R&S®AFQ100B.
It encloses the following topics:
●LXI features, see Chapter 1, "LXI (R&S AFQ100B only)", on page 2.
●Note to the triggering when setting up several connected R&S AFQs, see Chapter 3, "Setting Up Sev-
eral Connected R&S AFQs", on page 19
●Tight@VNC instead of Ultra@VNC, see Chapter 2.1, "Remote Access via Tight@VNC", on page 12
●Standard password for remote desktop connection, see "Remote Access Password" on page 12
●TRIGGER KEY functions, see Chapter 2.3, "Activating Remote Desktop with the Trigger Key",
on page 18
●Using R&S VISA for remote control over LAN, see Chapter 2.2, "Remote Control over LAN using
VXI-11 Protocol", on page 13
Supplement
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(;ÙÓÜ2)

Contents
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Contents
1 LXI (R&S AFQ100B only).......................................................................2
2 Remote Control.................................................................................... 11
3 Setting Up Several Connected R&S AFQs.........................................19
1 LXI (R&S AFQ100B only)
Refers to "Configuring the R&S AFQ for Network Operation" in the Operating Manual.
1.1 LXI Configuration
LAN eXtensions for Instrumentation (LXI) is an instrumentation plattform for measuring
instruments and test systems that is based on standard Ethernet technology. LXI is
intended to be the LAN-based successor to GPIB, combining the advantages of Ether-
net with the simplicity and familiarity of GPIB.
Like GPIB, LXI determines and standardizes the way the instrument behaves in a LAN.
The LXI implementation by the Rohde & Schwarz Signal Generators allows you to
change certain LAN settings, to reset the LAN connection as well as to easy identify
the instrument.
For information about the LXI standard refer to the LXI website at http://www.lxistan-
dard.org. See also "News from Rohde & Schwarz, article 2006/II - 190".
The R&S AFQ complies with LXI and provides an integrated "LXI Status" dialog for LXI
status indication and reset of the LAN configuration (LAN Configuration Initialize, LCI).
To access the LXI Status dialog, press the SETUP key and select "Remote > LXI Sta-
tus".
For further information, see Chapter 1.2, "LXI Status", on page 10.
Firmware update
After a firmware update, shut-down and re-start the instrument in order to enable the
full LXI functionality.
Default state of the network settings
According to the LXI standard, an LCI must set the following parameters to a default
state.
LXI Configuration

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Parameter Value
TCP/IP Mode DHCP + Auto IP Address
Dynamic DNS Enabled
ICMP Ping Enabled
Password for LAN configuration LxiWebIfc
The LCI for the R&S AFQ also resets the following parameters:
Parameter Value
Hostname <Instrument-specific host name>
Description Vector Signal Generator
Negotiation Auto Detect
VXI-11 Discovery Enabled
The LAN settings are configured using the instrument's .
1.1.1 LXI Browser Settings
The instrument's LXI browser interface works correctly with all W3C compliant brows-
ers.
Typing the instrument's host name (LAN device name) or IP address in the address
field of the browser on your PC opens the "Instrument Home Page" (welcome page).
To access the instrument via the web browser:
► Type in the instrument's host name or IP address in the address field of the
browser on your PC, for example http://10.111.10.205.
Tip: The specific IP address (host address / instrument name) is used by the con-
troller programs to identify and control the instrument. It is automatically assigned
by the DHCP server the first time the instrument is registered on the network. The
host name is usually composed of the instrument name and the serial number:
<instrument name><serial number>, e.g. RSAFQ100B1000011.
Note: Do not add the missing zeros in the IP address, while opening the instru-
ment home page.
The instrument home page (welcome page) opens.
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The "Instrument Home Page" displays the device information required by the LXI
standard including the VISA resource string in read-only format.
The navigation pane of the browser interface contains the following elements:
●"LXI"
– "Home" opens the instrument home page.
The home page displays the device information required by the LXI standard,
including the VISA resource string in read-only format.
– "Device Indicator" activates or deactivates the LXI status indication.
When activated, the LXI LEDs flash, both in the browser dialog and in the LXI
dialog of the connected instrument. A green LXI status symbol indicates that a
LAN connection has been established; a red symbol indicates that no LAN
cable is connected.
– "Lan Configuration" allows you to configure LAN parameters and to initiate a
ping, see Chapter 1.1.2.3, "Ping Parameter", on page 7.
– "Status" displays information about the LXI status of the instrument.
– "Utilities" provides access to the LXI event log functionality required by the LXI
standard.
●"Instrument Control"
– "Web Control" provides remote access to the instrument, see Chapter 1.1.2.4,
"Web Control", on page 8 .
●"Diagnostics"
– "SCPI Remote Trace" records messages exchanged via the remote control
interface, see Chapter 1.1.2.5, "SCPI Remote Trace", on page 9.
●"Help"
– "Glossary" explains terms related to the LXI standard.
–www.rohde-schwarz.com opens the Rohde & Schwarz home page.
LXI Configuration

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► Press the "Inactive (press to toggle)" button to activate the connection.
A green flashing status LED indicates the active connection. If the LAN connection
fails, the LED turns red.
The status of the LAN connection is also indicated by the "LAN Status indicator" in
the "LXI Status" dialog.
The "Device Indicator" setting is not password-protected.
For further information, see section Chapter 1.2, "LXI Status", on page 10.
The navigation pane of the browser interface contains the following control elements:
●"LAN Configuration" opens the LAN Configuration page.
●"LXI Glossary" opens a document with a glossary of terms related to the LXI stan-
dard.
●"Status" displays information about the LXI status of the instrument.
1.1.2 LAN Configuration
The "LAN Configuration" web page provides access to the parameters required for
identifying the R&S AFQ in the network, and allows modification.
Password protection
Changing the LAN configuration is password-protected. The default password is Lxi-
WebIfc (notice upper and lower case characters). This password cannot be changed in
the current firmware version.
It comprises the following navigation entries.
●IP Configuration........................................................................................................ 5
●Advanced LAN Configuration....................................................................................6
●Ping Parameter......................................................................................................... 7
●Web Control.............................................................................................................. 8
●SCPI Remote Trace..................................................................................................9
1.1.2.1 IP Configuration
The "IP Configuration" page displays all mandatory LAN parameters.
LXI Configuration

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The "IP Address Mode" selects a configuration mode for the IP address of the
R&S AFQ. With static configuration, the entered IP address, subnet mask, and default
gateway are used. With dynamic configuration, DHCP or dynamic link local addressing
(automatic IP) are used to obtain the instrument IP address.
1.1.2.2 Advanced LAN Configuration
The "Advanced LAN Configuration" menu provides LAN settings that are not declared
mandatory by the LXI standard.
LXI Configuration

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The following advanced parameters are available:
●"mDNS and DNS-SD": The additional protocols "multicast DNS" and "DNS service
discovery" are used for device communication in zero configuration networks,
working without DNS and DHCP.
●"ICMP Ping enabled": Must be enabled to use the ping utility.
If you disable this setting, the instrument does not answer ping requests. The set-
ting does not affect the LXI ping client. You can ping other hosts from the instru-
ment, even if the setting is disabled.
●"VXI-11 Discovery": Must be enabled to detect the instrument in the LAN.
If you disable this setting, the instrument cannot be detected by the VXI-11 discov-
ery protocol mechanism. The setting does not affect other detection mechanisms.
Setting up a VXI-11 connection via the IP address or the host name is independent
of this setting.
1.1.2.3 Ping Parameter
The "Ping Client" page provides the ping utility to verify the connection between the
LXI-compliant instrument and another device.
The ping is initiated from the instrument. Using the ICMP echo request and echo reply
packets, the function checks whether the communication with a device via LAN works.
Ping is useful for the diagnosis of IP network or router failures.
The ping utility is not password-protected.
To initiate a ping from the instrument to the device:
1. Enable "ICMP Ping" on the "Advanced LAN Configuration" page (enabled after an
LCI).
2. Select the "Ping Client" page.
3. In the "Destination Address" field, enter the IP address of the device to be pinged
(without the ping command and without any further parameters), e.g.
10.111.10.203.
4. Select "Submit".
LXI Configuration

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1.1.2.4 Web Control
The web control functionality provides remote operation via VNC using a Web browser
(with HTML5). This mode does not require additional installation or activation. The
VNC protocol allows simultaneous operation from several remote devices. The instru-
ment remains locally operable.
The GUI of the R&S AFQ is visible. To perform the settings, you can operate the
instrument as with the manual control. The instrument controls are available via the
front panel simulation. File upload and download between the instrument and the
remote PC is also available.
Starting a Remote Control via the LXI web browser
This section assumes that the instrument and the controller PC are connected in the
LAN.
1. Start a web browser that supports html5 (W3C compliant).
2. Enter the IP address of the R&S AFQ in the browser's address bar.
The R&S AFQ's welcome page is displayed.
3. In the navigation pane, select "Instrument Control" > "Web Control".
Remote access to the instrument requires the password. The default password is
instrument.
4. Enter the password and confirm with the ENTER key.
After the connection is established, the current screen of the R&S AFQ is displayed
in the browser window.
LXI Configuration

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5. Use the mouse cursor and keyboard to access the functionality of the instrument
as you would directly perform the settings on the instruments front panel.
1.1.2.5 SCPI Remote Trace
The remote trace functionality allows you to trace input and output strings at the
remote control interface of the R&S AFQ.
A recorded trace (message log) can be evaluated directly in the dialog. Use the high-
lighting and navigation functions provided in the lower toolbar to locate error messages
and messages containing arbitrary search strings. You can also export the message
log to a *.csv file and evaluate the file using a suitable program.
To trace and display messages:
1. In the navigation pane, select "Diagnostics" > "SCPI Remote Trace".
2. In the toolbar bar of the "SCPI Remote Trace" page, select "live mode" > "on" and
"logging" > "on".
"live mode > on" displays all commands and responses, and "logging > on" also
traces messages.
3. If you now control the instument with SCPI commands, using an appropriate tool,
the SCPI remote trace records the information sent and received.
The function records all sent commands, received responses and messages, and
stores them in an internal database. If "live mode" is disabled, you can display the
recent traces upon request, using the "refresh" button. You can also store the log in
a file.
Note: The diagnostics functionality will be extended in later releases, e.g. to down-
load or upload SCPI command files from / to the instrument.
LXI Configuration

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Toolbars
The toolbar at the top of the dialog provides basic settings and functions.
●"Live mode" / "logging": If logging is switched on, messages are traced. They are
stored in an internal database and can be displayed upon request, using the
refresh button (live mode off) or they can be displayed automatically (live mode
on).
●"Filter": applies a filter to columns and/or rows when working (live mode off)
●"Refresh": reads the message log from the internal database and displays it
●"Download": stores the SCPI trace log to a *.csv file
●"Clear": deletes all message log entries in the database and on the screen
●"Details": displays details of the selected message, for example an SCPI command
in hex format (also possible by double\-clicking a message)
Columns
The following columns are available if no column filter is applied:
●"Rec": record number of the message within the message log
●I: number of the subinstrument
●"MT": indicates the type of the message. Possible values and related message
contents are:
– > = incoming command
– < = outgoing response to a query
– E = error message, highlighted by red color
– T = execution time, i.e. time required by the instrument to process the com-
mand internally
●"message": indicates the type of the message. Possible values and related mes-
sage contents are:
– > = incoming command
– < = outgoing response to a query
– E = error message, denoted in red
– T = execution time, i.e. time required by the instrument to process the com-
mand internally
1.2 LXI Status
Refers to "General Instrument Settings > Setup Key" in the Operating Manual.
The "LXI - LAN eXtensions for Instruments - Status..." dialog displays the settings and
status of the LAN and allows to reset the LAN connection.
For more information about LXI, seeChapter 1.1, "LXI Configuration", on page 2.
LXI Status

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LAN Status
The LED indicates the LXI status.
The LAN Status is also indicated with the LED "LAN Status" on the front panel of the
instrument.
"green" normal operation
"green (flashing)"
device identification
"red" LAN fault
LAN Reset
Initiates the network configuration reset mechanism for the instrument and resets the
hostname, MAC address, and IP address.
Alternatively, the LAN RESET button on the front panel of the instrument can be used.
To initiate the network configuration reset, press the button longer than 4 sec and wait
for the signal tone.
See "Default state of the network settings" on page 2 for information on the reset
parameters.
To open the "Instrument Home Page" (welcome page), type the instrument's computer
name (host name) or IP address in the address field of the browser on your PC, e.g.
http://10.111.10.205.
Note: A LAN reset may require an instrument reboot.
2 Remote Control
Refers to "Putting into Operation > Manual Remote Control via an External Controller"
in the Operating Manual.

Remote Control
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As an alternative to remote control using programmed commands, the R&S AFQ can
also be manually controlled from a remote location via remote access, or remote desk-
top.
These operating modes are fundamentally different, even though they are often seen
as interchangeable:
●Remote Desktop
In this mode, a Windows desktop connection from the remote computer (external
controller) and the R&S AFQ is established and you can set your application as
with manual operation.
●Remote Access
In this mode, the instrument is accessed from an external controller via a LAN con-
nection, using a standard Web browser and the common cross-plattform technol-
ogy VNC (Virtual Network Computing). While the instrument is in operation, the
user interface of the instrument is displayed on the remote computer, and VNC
provides access to all of the applications files and network resources of the instru-
ment.
The remote computer requires the VNC client, either as a stand-alone program or
as a plug-in for a browser.
●Remote Control
In this mode, all settings are configured from a remote PC using remote control
commands. The GUI of the instrument is not displayed. Remote control commands
can be executed either individually, or you can also create programs for repeating
applications, that are performed faster than with manual operation and are always
reproducible.
2.1 Remote Access via Tight@VNC
Refers to "Configuration for Manual Remote Control" in the Operating Manual.
Instead of the remote access via Ultra@VNC, the R&S AFQ allows you to remotely
control the instrument via the program Tight@VNC, an open source desktop software
application. It uses extended VNC RFB protocol, and additionally features e.g. listening
mode or password protection.
The software and additional information is available at the http://tightvnc.com/ website.
For the setting up and operating, you can proceed similarly as described to
Ultra@VNC in the manual.
Remote Access Password
The default password for remotely accessing the R&S AFQ is instrument.
1. To change the password, click the VNC icon in the windows task bar and select
"Properties".
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In the properties dialog, you can set your own password.
2. Enter the new password and confirm with "OK"
2.2 Remote Control over LAN using VXI-11 Protocol
Refers to "Remote Control Basics" > "Switchover to Remote Control " > "Remote Con-
trol over LAN Interface". "Remote Control over LAN using VXI-11 Protocol"substitutes
the description of "Setting up Control of the R&S AFQ in the 'Measurement & Automa-
tion Control' Program" in the user manual.
Rohde & Schwarz provides the standardized I/O software library R&S VISA for com-
munication via TCP/IP (LAN: HiSlip, VXI-11 and raw socket) or USB (USBTMC) inter-
faces.
R&S VISA is available for download at the Rohde & Schwarz website http://
www.rohde-schwarz.com/rsvisa.
In this example, the R&S VISA software library is used to set up a LAN remote control
link and remotely control the R&S AFQ. R&S VISA is running on a controller PC with
Windows operating system. When the connection is set up you can send commands to
the instrument, and receive the responses.
The remote control connection requires a VISA installation but no additional hardware
on the controller PC. The LAN I/O channel is selected at initialization time using the
VISA resource string (also referred to as "address string"). A VISA alias (short name) is
used to replace the complete resource string. The host address is either the
R&S AFQ's hostname or IP address. See "Remote Control Basics" > "Switchover to
Remote Control " > "Remote Control via LAN Interface" in the user manual of the
R&S AFQ.
In this example, it is assumed that:
●A LAN remote control link between the controller and the R&S AFQ is already set
up.
●The R&S VISA program is installed on the remote PC, see "http://www.rohde-
schwarz.com/rsvisa > RS VISA Release Notes".
Configuring the controller
To remote control the R&S AFQ, we use the R&S VISA Tester application.
Remote Control over LAN using VXI-11 Protocol

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The instrument is preconfigured for networks using DHCP (dynamic host configuration
protocol). If this configuration is used, enter the computer name in the position of the IP
address.
To enable the external controller to communicate with the R&S AFQ via TCP/IP proto-
col, set up a remote control link as follows:
1. Make sure that the controller and the instrument are connected in the network (net-
work cable) and switched on.
2. On the controller, start "R&S VISA > Tester 32bit" or "R&S VISA > Tester 64bit",
respectively.
3. In the menu bar, select "Choose VISA Implementation > Rohde & Schwarz Visa".
4. Select "Rohde & Schwarz Visa" and confirm with "OK".
5. In the menu bar, select "Find Resource" to search for the instrument in the LAN.
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6. Select "VXI-11" and "Find Resources".
R&S VISA scans the network for connected instruments and lists all detected instu-
ments in the "Resource" list.
Note: The search may take some time, particularly in large networks.
7. Select the required instrument and confirm with "Select".
The "Find and select resource" dialog closes and R&S VISA indicates the instru-
ments IP address in the "Resource" field of the main application window.
8. As an alternative to the IP address, you can assign an alias name to the R&S AFQ:
a) In the menu bar, select "RsVisaConfig".
b) In the toolbar, select "+" to access the "VISA Resource String Composer".
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c) Fill in the "Alias" name, the "VISA Resource String" and the "Device IP Address
or host name" as shown in the figure, and confirm with "OK".
The "Alias" name is assigned to the instrument.
d) Close the dialog.
The R&S AFQ is now registered in the program and can be addressed via the
resource string or alias name.
9. In the main window, select "Connect".
R&S VISA establishes the connection to the R&S AFQ.
Now you can send settings to configure the instrument and receive its responses.
Note: If the connection cannot be set up, R&S VISA displays an error in the log
view.
Check whether the controller and the instrument are connected to the network (net-
work cable) and switched on. Correct spelling of the IP address or the computer
name can also be checked. For further error location, inform the network adminis-
trator. In large networks, specification of additional addresses may be required for
link setup, e.g. gateway and subnet mask, which are known to the network admin-
istrator.
For further information on the functions to read and write to an open session, as
well as the utility applications the software provides, see the R&S VISA User Man-
ual.
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Starting a remote control over LAN (using VXI-11)
To set the instrument to remote control, you can use the addressed command &GTR, or
send any command from the controller.
1. Start the R&S VISA Tester and establish the connection to the R&S AFQ, see
"Configuring the controller" on page 13.
2. In the R&S VISA "Basics" tab, enter a SCPI command, e.g. "*IDN?" and confirm
with "Query".
The instrument is switched to remote control when it receives a command from the
controller.
Tip: Switching from manual operation to remote control and vice versa does not
affect the other instrument settings.
3. Select "Read" to obtain the instrument response.
Tip: If the "Show Log" checkbox is checked R&S VISA displays each VISA function
call in the log-view on the left. If you check the "Write Log" checkbox the log-view
entry is written to the log file as well. You can operate the log-view in two modes:
the "Live Mode" shows only the most recent messages whereas the "View Mode"
allows you to scroll the history.
4. To set, e.g. the frequency, enter SOURCE:STAT 1 and select "Write".
To check the performed setting, select SOURCE:STAT?"Read".
The instrument response is 1, i.e. the ARB generator is switched on.
While remote control is active, the REMOTE status LED on the front panel indi-
cates that the instrument is in remote control mode. The operation via the front
panel or via mouse and keyboard are locked, allowing a remote control program to
be performed without interruption.
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5. Although operation via front panel, mouse and keyboard is disabled, the dialog
boxes can still be opened, for example to verify settings. The buttons and setting
fields are grayed out and cannot be activated.
Additionally, you can disable the access to the dialogs with the command
SYST:KLOC ON to protect the instrument against unauthorized readings.
6. To prevent unintentional return to manual operation, use the command &LLO (see
section "VXI-11 Interface Messages" in the operating manual).
The instrument switches to "REM-LLO" state.
The automatic transition from local state to remote state by a subsequent remote
command, and the command *GTL are disabled.
To return to manual mode is only possible via remote control.
7. To return to manual operation send the interface command &GTL.
Note: Before returning to manual control, command processing must be comple-
ted. Otherwise, the instrument switches back to remote control immediately.
Use the &GTR to disable the "REM-LLO" state.
2.3 Activating Remote Desktop with the Trigger Key
Refers to "Trigger Key" in the Operating Manual.
Apart from triggering and LAN reset, the trigger key also enables you to activate
remote desktop operation:
●Pressing short
triggers manually
●Pressing long
executes an LXI (LAN) reset
●Pressing the trigger key during startup (while the LEDs are flashing)
enables you to modify the firewall settings, and temporarily enables access to the
instrument via remote desktop.
The start screen of the instrument software displays a dialog which allows you to
enable remote desktop operation either permanently or for the current session
only.
Refer also to chapter Putting into Operation > Booting the R&S AFQ in the Operat-
ing Manual.
Activating Remote Desktop with the Trigger Key

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3 Setting Up Several Connected R&S AFQs
Refers to "Setting Up Several Connected R&S AFQs for Precise Simultaneous Signal
Output" in the Operating Manual.
When setting up several connected instruments, the master R&S AFQ must be trig-
gered externally.