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42
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 rst 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 rst 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).
6.3.2 Ethernet settings
In addition to the USB interface, the optional interface card
R&S®HO730 resp. R&S®HO732 includes an Ethernet
interface. The required parameters are selected in the
power supply once ETHERNET has been selected as
interface. You can specify all parameters and assign a xed
IP address. You can also assign a dynamic IP address with
the activated DHCP function. Please contact your IT
management to congure the settings properly.
If the device has an IP address, it can be accessed via web
browser at this IP since the R&S®HO730 resp. R&S®HO732
includes an integrated web server. Enter the IP address in
the location bar on your browser (http//xxx.xxx.xxx.xx).
This opens a window that includes the instrument name
and type, serial number and interfaces with technical
information and congured parameters. For further infor-
mation, please refer to the R&S®HO730 resp. R&S®HO732
manual on the ROHDE & SCHWARZ homepgage.
PC and instrument have to be connected to the same network.
Otherwise a remote connection is not possible.
If DHCP is used and the system cannot assign an IP address to
the R&S®HMP (for instance, if no Ethernet cable is connected or
the network does not support DHCP), it may take up to three min-
utes until a timeout allows the interface to be congured again.
6.4 IEEE 488.2 / GPIB (Option R&S®HO740)
The optional interface card R&S®HO740 includes a
IEEE488.2 interface. The required parameters are selected
in the power supply once IEEE 488 has been selected as
interface. For further information, consult the R&S®HO740
manual.
In general, the R&S®HO730/HO732 works with a RAW-Socket
communication to control the instrument and to retrieve the
measuring values. Therefore, a TMC protocol or a similar protocol
will not be used.
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