User manual
57
Remote control
13 Remote control
By default, the R&S®HMO Compact series includes a
HO720USB/RS-232interface.Youcanndthedrivers for
this interface on the product CD enclosed with the instru-
ment or on the ROHDE & SCHWARZ Homepage.
To achieve external control, the R&S®HMO Compact series
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.
13.1 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 oscilloscope 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
tog.13.1.
The maximum voltage variation at the Tx, Rx, RTS and CTS
connections is ±12 Volt. The RS-232 standard parameters
for the interface are as follows:
To enable communication, the selected interface and the respec-
tive settings in the measuring instrument must be identical to the
selections for the PC.
Fig. 13.1: Pin assignment of the RS-232 interface
Pin
2 Tx Data (data from oscilloscope to external device)
3 Rx Data (data from external device to oscilloscope)
7 CTS Clear to Send
8 RTS Request to Send
5 ground (reference potential, connected via oscilloscope
(measuring category 0) and power cable to the grounding
conductor
9 +5V supply voltage for external devices (max. 400mA)
❙ 8-N-1 (8 data bits, no parity bit, 1 stop bit)
❙ RTS/CTS hardware protocol: none.
The RS-232 interface parameters can be set in the SETUP
menu via soft menu key INTERFACE. Please make sure
that the RS-232 soft menu key is blue highlighted. A soft
menu will be opened where you can set and save all RS-
232 interface parameters.
13.2 USB
The USB interface must be selected in the menu of the os-
cilloscope and requires no further action. The actual 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®HMO
Compact series driver is installed, the operating sys-
tem answers with “Found New Hardware”. Only in this
case the USB driver must be installed. Further informa-
tionabouttheUSBdriverinstallationyoucanndinthe
HO720/HO730/HO732 installation guide internal of the dri-
verle.
In addition, you may use the free software HMExplorer.
This Windows application offers the R&S®HMO Compact
series a terminal function, the option to create screenshots
and to sort the measured data storage.
13.3 Ethernet (Option HO730 / 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.
13.3.1 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 themselves.
IP addresses are represented (with the IP version 4) as four
The currently available USB driver have been fully tested and re-
leased for Windows XP™, VISTA™, Windows 7™ and Windows
8™ (32 + 64 Bit).
The following requirement for USB driver installation are
necessary:
1 R&S®HMO Compact series 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.