Network Operation and Remote Control
R&S
®
SMW200A
708User Manual 1175.6632.02 ─ 16
Socket connections are established on a specially defined port. The socket address is
a combination of the IP address or the host name of the instrument and the number of
the port configured for remote-control. All R&S SMW use port number 5025 for this
purpose. The port is configured for communication on a command-to-command basis
and for remote control from a program.
12.2.2 USB Interface
For remote control via the USB connection, the PC and the instrument must be con-
nected via the USB type B interface. A USB connection requires the VISA library to be
installed. VISA detects and configures the R&S instrument automatically when the
USB connection is established. You do not have to install a separate driver.
USBTMC (USB Test & Measurement Cass Specification) is a protocol that is built on
top of USB for communication with USB devices, like GPIB. It defines class code infor-
mation of the instrument, that identifies its functionality to load the respective device
driver. Using VISA library, it supports service request, triggers, and other specific oper-
ations, similar to GPIB.
12.2.2.1 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
= 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 on the rear of the instrument
[::INSTR] = indicates the instrument resource class (optional)
To set the USB resource string, see Remote Access Settings.
Example:
USB::0x0AAD::0x0092::100001
0x0AAD is the vendor ID for Rohde&Schwarz
0x0092 is the product ID for the R&S SMW
100001 is the serial number of the particular instrument
12.2.3 GPIB Interface (IEC/IEEE Bus Interface)
To be able to control the instrument via the GPIB bus, the instrument and the controller
must be linked by a GPIB bus cable. A GPIB bus card, the card drivers and the pro-
gram libraries for the programming language used must be provided in the controller.
Remote Control Interfaces and Protocols
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