LCX_UserManual_en_08_1.pdf - 第155页

Network operation and remote control R&S ® LCX Series 155 User Manual 1 179.2260.02 ─ 08 driver . Using the VISA library , it supports service request trigger , and other specific operations, similar to GPIB. For con…

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Network operation and remote control
R&S
®
LCX Series
154User Manual 1179.2260.02 ─ 08
To assign a user-specific port number, see Section 10.5, "Adjusting interface
addresses", on page 169.
FTP communication
ftp://<host address>[::<port>]
port = determines the used port number
By default, instruments from Rohde & Schwarz use port number 21 for FTP communi-
cation.
Example:
ftp://192.1.2.3/
To assign a user-specific port number, see "Assigning the FTP port address manually"
on page 171.
VNC communication
vnc://<host address>[::<port>]
port
= determines the used port number
By default, instruments from Rohde & Schwarz use port number 5900 for VNC commu-
nication.
Example:
vnc://192.1.2.3
To assign a user-specific port number, see "Assigning the VNC port manually"
on page 170.
10.2.2 USB interface
For remote control using USB, the PC and the instrument must be connected over the
USB B interface.
The USB B connector is at the rear panel of the instrument.
Software for instrument control and the VISA program library must be installed on the
controller. VISA detects and configures the Rohde & Schwarz instrument automatically
when the USB connection is established. You do not have to install a separate driver.
You can communicate with the instrument over the USB TMC class or the CDC class
protocols:
●
USBTMC
(USB Test & Measurement Class Specification) is a protocol that is built on top of
USB for communication with USB devices, like GPIB. It defines class code informa-
tion of the instrument that identifies its functionality to load the respective device
Remote control interfaces and protocols
Network operation and remote control
R&S
®
LCX Series
155User Manual 1179.2260.02 ─ 08
driver. Using the VISA library, it supports service request trigger, and other specific
operations, similar to GPIB.
For control, you can use the SCPI terminal function of the R&S HMExplorer soft-
ware. This software also provides logging of measurement values, or graphical dis-
play.
●
CDC
(Communications Device Class, also known as VCP Virtual COM Port) is a proto-
col used for emulating serial ports over USB. Using the CDC protocol, you have to
install the USB VCP driver corresponding to the Windows operating system of the
controller PC, available for download on the Rohde & Schwarz product site at
www.rohde-schwarz.com/driver/lcx/.
To select the USB interface, see "Selecting the USB communication class protocol"
on page 172-
USB resource string
The resource string represents an addressing scheme that is used to establish a com-
munication session with the instrument. It is based on the instrument address and
some instrument- and vendor-specific information.
The USB resource string syntax is as follows:
USB::<vendor ID>::<product ID>::<serial number>[::INSTR]
USB
= denotes the used interface
<vendor ID> = is the manufacturer ID for Rohde & Schwarz
<product ID> = is the product identification of the instrument
<serial number> = is the individual serial number at the rear of the instrument
[::INSTR] = indicates the instrument resource class (optional)
To select the USB communication protocol, see "Selecting the USB communication
class protocol" on page 172.
Example:
USB::0x0AAD::0x01DD::100001
0x0AAD is the vendor ID for Rohde & Schwarz.
0x01DD is the product ID for the R&S LCX.
100001 is the serial number of the particular instrument.
10.2.3 GPIB interface (IEC/IEEE bus interface)
Option: R&S NG-B105 GPIB (IEC 625/IEE 488) bus interface
The GPIB interface is at the rear panel.
To control the R&S LCX over the GPIB bus, the instrument and the controller must be
connected with a GPIB bus cable. A GPIB bus card, the card drivers and the program
libraries for the programming language used must be provided in the controller.
Remote control interfaces and protocols
Network operation and remote control
R&S
®
LCX Series
156User Manual 1179.2260.02 ─ 08
See Remote control via SCPI for additional information on the characteristics, control
commands and messages of the GPIB interface.
GPIB address
The controller addresses the instrument with the GPIB bus channel, see Section 9.2.1,
"Interface settings", on page 125. GPIB provides channel addresses from 0 to 30. The
GPIB address is preset to 20 (factory-set), but you can adjust it according to your net-
work environment, see "Assigning the GPIB address manually" on page 173. An instru-
ment preset does not affect the GPIB address.
The GPIB resource string syntax is as follows:
GPIB:://<channel>[::INSTR]
GPIB
= denotes the used interface
<channel address> = the used channel
[::INSTR] = indicates the instrument resource class (optional)
If the VISA implementation supports the GPIB interface, you can optionally define the
VISA Instrument Control Resource (INSTR). It is used to define the basic operations
and attributes for a device, such as reading, writing, or triggering.
Example:
GPIB::28
28 is the selected GPIB bus channel.
10.2.4 Status reporting system
The status reporting system saves all information on the current operating state of the
instrument and the errors that have occurred. This information is saved in the status
registers and in the error queue. You can query the status of the registers remotely, i.e.
over the USB, GPIB or LAN interfaces with the commands of the Section 11.17, "STA-
Tus subsystem", on page 228.
Remote control interfaces and protocols