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Remote Control
12 Remote Control
By default, the R&S®HMS-X includes a R&S®HO720 USB/
RS-232 interface. You can find the drivers for this interface
on the ROHDE & SCHWARZ Homepage.
To achieve external control, the R&S®HMS-X uses the
scripting language SCPI (= Standard Commands for
Programmable Instruments). The provided USB/RS232
dual interface (optional Ethernet/USB or IEEE-488 GPIB)
enables you to control the ROHDE & SCHWARZ
instrument externally via remote connection (remote
control). As a result, you can access nearly all functions
that are available during the manual operating mode via
front panel. To download a PDF document with a detailed
list of supported SCPI commands, please visit the ROHDE
& SCHWARZ homepage.
12.1 RS-232
The RS-232 interface is built with a 9-pin D-SUB connec-
tor. This bidirectional interface allows the transfer of setup
parameters, data and screenshots from an external device
(e.g. PC) to the power supply or vice versa. It is possible to
establish a direct connection from the PC (serial port ) to
the interface via 9-pin shielded cable (1:1 wired). The max-
imum length must not exceed 3 m. The pin assignment for
the RS-232 interface (9-pin D-SUB connector) please refer
to fig. 6.1.
The maximum voltage variation at the Tx, Rx, RTS and CTS
connections is ±12 Volt. The RS-232 standard parameters:
❙
8-N-1
(8 data bits, no parity bit, 1 stop bit)
❙RTS/CTS hardware protocol: none.
To enable communication, the selected interface and the respec-
tive settings in the measuring instrument must be identical to
the selections for the PC.
In order to set these parameter at the instrument, please
press the SETUP key and choose the menu item INTER-
FACE. Make sure that the RS-232 interface is chosen. The
softmenu PARAMETER opens a menu where you can set
all parameters for the RS-232 communication.
12.2 USB
The USB interface must be selected in the menu of the
spectrum analyzer and requires no further action. The ac-
tual USB driver can be downloaded from the ROHDE &
SCHWARZ homepage for free. If a connection between PC
and the instrument has been established and no R&S®HMS
USB driver is installed, the operating system answers with
“Found New Hardware”. Only in this case the USB driver
must be installed. Further information about the USB dri-
ver installation you can find in the R&S®HO720/HO732 ins-
tallation guide internal of the driver file.
In addition, you may use the free software HMExplorer.
This Windows application offers the R&S®HMS-X a termi-
nal, a screenshot and an EMC function.
12.3 Ethernet (Option R&S®HO732)
For the direct connection with a host (PC) or indirect con-
nection over a SWITCH, a doubly protected network
cable (e.g. CAT.5, CAT.5e, CAT.5+, CAT.6 or CAT.7) is re-
quired, equipped with an Ethernet plug type the RJ-45 at
each end. Either an uncrossed or a crossed network cable
(cross over cable) can be used.
12.3.1 IP networks (IP – Internet protocol)
In order that two or several network elements (e.g. measu-
ring instruments, host/PC‘s, …) can communicate over a
network with one another, some fundamental connections
have to be considered, so that data communication is error
free and unimpaired.
For each element in a network an IP address has to be as-
signed, so that they can exchange data among them-
selves. IP addresses are represented (with the IP ver-
sion 4) as four decimal numbers separated by points (e.g.
192.168.15.1). Each decimal number is represented by a bi-
nary number of 8 bits. IP addresses are divided into pub-
lic and private address ranges. Public IP addresses will be
The currently available USB driver have been fully tested and re-
leased for Windows XP™, VISTA™, Windows 7™, Windows 8™
and Windows 10™ (32 + 64 Bit).
The following requirement for USB driver installation are
necessary:
1 R&S®HMS-X with an activated USB interface.
2 A PC with operating system Windows XP™, VISTA™, Win-
dows 7™, Windows 8™ or Windows 10™ (32 or 64Bit).
3 Administrator rights are necessary for the installation of the
driver. If an error message regarding spelling errors appears,
the rights to install the driver are not given. In this case, ple-
ase contact your IT department to obtain the necessary
rights.
Fig. 12.1: Pin assignment of the RS-232 interface
Pin
2 Tx Data (data from instrument to external device)
3 Rx Data (data from external device to instrument)
7 CTS Clear to Send
8 RTS Request to Send
5 ground (reference potential, connected with instrument
(safety class II) and power cable to the grounding conductor
9 +5V supply voltage for external devices (max. 400mA)
Summary of Contents for HMS-X
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