Remote control interfaces and protocols
R&S
®
NRP Series
45
Getting Started 1419.0170.02 ─ 18
matically when the USB connection is established. Apart from the USBTMC driver
(which comes with the installation of the R&S
NRP Toolkit), you do not have to
install a separate driver.
USB Test & Measurement Class Specification (USBTMC) is a protocol that is built
on top of USB for communication with USB devices. It defines class code infor-
mation of the power sensor that identifies its functionality to load the respective
device driver. Using VISA library, it supports service request, triggers and other
operations that are commonly found in GPIB devices.
Besides USBTMC, the NRP legacy protocol is available to ensure the compatibil-
ity of the R&S NRP power sensors with the R&S
NRP
‑
Z series of power sensors.
The usage of this protocol is not recommended for new applications.
The resource string represents an addressing scheme that is used to establish a
communication session with the power sensor. It is based on the power sensor
address and some power sensor- and vendor-specific information.
USB Resource String
The syntax of the used USB resource string is:
USB::<vendor ID>::<product ID>::<serial number>[::INSTR]
where:
●
<vendor ID> is the vendor ID for Rohde & Schwarz (0x0AAD)
●
<product ID> is the product ID for the Rohde & Schwarz power sensor
●
<serial number> is the individual serial number on the name plate at the rear
side of the power sensor
Table 6-2: R&S
NRPxxA(N) USB product IDs
R&S NRP power sensor
USB product ID
R&S
NRP6A
0x0178
R&S
NRP6AN
0x0179
R&S
NRP18A
0x014E
R&S
NRP18AN
0x014F
Table 6-3: R&S
NRPxxS(N) USB product IDs
R&S NRP power sensor
USB product ID
R&S
NRP8S
0x00E2
R&S
NRP8SN
0x0137
USB interface
