Remote Control; Rs-232; Usb; Fig. 9.1: Rs-232 Pin Assignment - Hameg HMF2525 Handbuch

R e m o t e C o n t r o l

9 Remote Control

The HMF series is basically supplied with an USB/RS-232
interface. The respective drivers are available on the enclosed
Product CD or can be downloaded at http://www.hameg.com.
To establish a basic communication a serial cable (1:1) as well
as a terminal program like Windows HyperTerminal is required.
The Windows HyperTerminal program is part of any Windows
operating system (Windows Vista not). A detailed instruction
how to setup a basic communication using HyperTerminal is
available at the HAMEG Knowledge Base at http://www.hameg.
com/hyperterminal.
The HMF2525 / HMF2550 uses SCPI (= Standard Commands
for Programmable Instruments) for remote control. Remote
control is possible via the built-in dual interface USB/RS-232
(options: Ethernet/USB, IEEE-488). The better part of the front
panel functions are available as remote control commands.
A detailed dokument about the provided SCPI commands is
available at http://www.hameg.com.
9.1

RS-232

The RS-232 interface is made as a 9 pole D-SUB connecter. Via
the bidirectional interface you can transfer settings, data and
screen dumps from an external device (PC) to the function
generator or vice versa. The direct physical link between the
function generator and serial port of the PC can be done via an
9 pole cable with shielding (1:1 wired). The maximal length must
below 3 meter. The exact pinning oft he plug is as follow:

Fig. 9.1: RS-232 pin assignment

Pin
2 Tx Data (data from function generator to external device)
3 Rx Data (data from external device to function generator)
7 CTS ready for sending
8 RTS ready for receiving
5 ground (ground reference, due to function generator (cate-
gory II) and power plug connected to earth)
9 +5 V supply voltage for external devices (max. 400 mA)
The maximum amplitude at Tx, Rx, RTS and CTS is ±12 Volt. The
standard RS-232 settings are:
8-N-1 (8 data bits,no parity, 1 stop bit), RTS/CTS hardware
protocol: none.
In order to set these parameter at the HMF, please press the
button MENU and the soft key Interface. Please make sure
that the RS-232 interface is chosen (menu text blue highlighted).
With the soft key menu Parameter you can set and save all
parameter for the RS-232 communication.
9.2

USB

The USB interface has to be chosen in the MENU of the func-
tion generator and does not need any setting. At the first
connection Windows™ asks for a driver. The driver you can
48
Subject to change without notice
find on the delivered CD or on our homepage www.hameg.com
at the download area for the HO720/HO730. The USB connec-
All descriptions regarding the USB interface are valid for
the HO720 interface card as well as for the optional HO730
USB part. All currently available USB driver are fully te-
sted, functional and released for Windows XP™, Windows
VISTA™ and Windows 7™ (32 + 64 Bit).
tion can be done via native USB or the virtual COM port (VCP).
The description how to install the driver you can find in the
HO720/730 installation manual.
If the virtual COM port (VCP) will be used, you have to
choose the USB interface internal of the function genera-
tor. On PC side the VCP has to be activated in the device
manager.
9.3 Ethernet (Option HO730)
The optional interface card HO730 includes an USB and Ether-
net interface. The settings of the parameter are done after
selecting the Ethernet interface and the soft key Para-
meter. You can set a fix IP adress. Alternative you can choose
a dynamic IP setting via the DHCP function. Please ask your IT
department for the correct setting of your network. If the func-
tion generator does have an IP adress you can open your web
browser and adopt the IP adress for the adress line (http//xxx.
xxx.xxx.xx). The web server will open with HMF device informa-
tion, the interface and it's setting.

Fig. 9.2: Web server with device data

With the function Screen Data you can transfer a screen
dump to the PC (using the right mouse click the screenshot can
be transferred to the clip board for further use). The link SCPI
Device Control opens a console to send remote SCPI
commands to the function generator.
In general, the HO730 works with a RAW-Socket com-
munication to control the instrument and to request the
measurement values. Therefore, a TMC or similar proto-
col is not supported.
9.4 IEEE 488.2 / GPIB (Option HO740)
The optional interface card HO740 does have a IEEE488.2 con-
nection. The settings of the interface can be done after choo-
sing the IEEE 488 interface and the soft key Parameter.
Further information you can find in the installation manual of
the HO740 on our homepage www.hameg.com.