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Remote Control
one logical AND operation between IP address and subnet
mask. The result is the network quota of the IP address.
The host quota of the IP address takes place via the bit by
bit logical NAND operation between IP address and subnet
mask. By the variable allocation of IP addresses in network
quota and host quota via subnet masks, one can specify IP
address ranges individually for large and small networks.
Thus one can operate large and small IP networks and
connect if necessary to the Internet via a router. In smaller
local networks the subnet mask 255.255.255.0 is mostly
used. Network quota (the first 3 numbers) and host quota
(the last number) are simple here without much mathe-
matical expenditure to determine and it can with these
subnet mask up to 254 network elements (e.g. measuring
instruments, hosts/PC‘s...) in a network be operated at the
same time.
Often also a standard gateway is present in a network. In
most local networks is this gateway with the router to the
Internet (DSL router, ISDN router etc.) is identical. Using
this (gateway -) router a connection can be manufactured
with another network. Thus also network elements, which
are not in the same (local) network, can be reached and/
or network elements from the local network are able to ex-
change data with network elements from other networks.
For a network-spreading data exchange the IP address
of the standard gateway must also be preset. In local
networks, mostly the first IP address within a network for
this (gateway -) router is used. Mostly routers in a local
network to be used as gateway have an IP address with a
„1“ in the last place of the IP address (e.g. 192.168.10.1).
10.3.2 Ethernet settings
In addition to the USB interface, the interface card includes
an Ethernet interface. Select Ethernet as interface and
press the soft menu key PARAMETER to then determine
the settings for the necessary parameters directly within
the R&S®HMC804x . You can specify all parameters and
assign a fixed IP address. You can also assign a dynamic IP
address with the activated DHCP function. Please contact
your IT management to configure the settings properly.
PC and instrument have to be connected to the same network.
Otherwise a remote connection is not possible.
Fig. 10.12: Ethernet settings
If the device has an IP address, it can be accessed via web
browser at this IP since the Ethernet interface includes an
integrated web server. Enter the IP address in the brows-
er’s address bar (http://xxx.xxx.xxx.xxx). This will open
a window including the instrument type and the serial
number.
10.3.3 LXI
LAN eXtensions for Instrumentation (LXI) is an instrumen-
tation platform for measuring instruments and test sys-
tems that is based on standard Ethernet technology. LXI is
Operation in a Network intended to be the LAN-based
successor to GPIB, combining the advantages of Ethernet
with the simplicity and familiarity of GPIB.
The R&S®HMC804x is LXI certified and supports the ver-
sion 1.4 (LXI Core 2011). Advanced functions are not sup-
ported. IVI (Interchangeable Virtual Instrument) instrument
drivers are a central component for the LXI certification.
So called IVI.net drivers are made available that are based
on the .NET framework 4 by Microsoft. LabView and
LabWindows/CVI drivers, created on the basis of LabWin-
dows/CVI 2012, are also available.
10.3.4 Webserver
The Ethernet interface offers a web server, which can be
used with a web browser (e.g. Internet Explorer). The fol-
lowing functions are supported by the Webserver:
❙Display of the device information
If DHCP is used and the system cannot assign an IP address to
the R&S®HMC804x (for instance, if no Ethernet cable is con-
nected or the network does not support DHCP), it may take up to
three minutes until a timeout allows the interface to be config
-
ured again.
Fig. 10.13: Display of the device information
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