Usb / Vcp; Ieee-488 (Gpib) - Hameg R&S HM8118 Benutzerhandbuch

9.2

USB / VCP

The interface includes a type B connector. To estab-
lish a direct connection with a host controller or an indi-
rect connection via USB hub requires a USB cable with a
type B socket on the one end and a type A socket on the
other end. It is not necessary to configure the measuring
instrument.
Type A Type B
The R&S®HO820 driver ZIP file contains a native USB and a
virtual COM port driver. The traditional version of the VCP
(virtual COM port) allows the user to communicate with
the measuring instrument using any terminal program via
remote commands once the corresponding Windows dri-
vers have been installed. The latest USB (VCP driver can
be downloaded from the Rohde & Schwarz website and
unpacked into an appropriate directory. If you do not have
a driver for the R&S®HM8118 bridge installed on the PC,
the operation system issues the message "New hardware
found" once the connection between the bridge and the
PC has been established. Additionally, the Found New
Hardware Wizard will be displayed. Installing the USB dri-
ver is only necessary if this occurs. For more information
on the USB (VCP) driver installation, please read the instal-
lation guide within the driver file.
The R&S®HO820 USB driver can only be installed on the PC if the
following minimum requirements are met:
1 A measuring instrument with integrated HO820 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 imperative for the driver installation.
If an error message or a write error are displayed it typically
means the required rights have not been assigned for the dri-
ver installation. If this is the case, please contact your IT de-
partment to obtain the necessary rights.
9.3

IEEE-488 (GPIB)

The GPIB address is set at the GPIB interface on the inst-
rument back panel and is connected to the PC with a GPIB
cable. The cable establishes a connection to a IEEE-488
controller (control unit of a IEEE-488 bus system). Any PC
equipped with the corresponding plug-in card can function
as IEEE-488 controller. If a IEC-625 cable must be used, an
appropriate plug-in adapter is required. The R&S®HO880
interface works in the Device mode, i.e. commands are re-
ceived by the controller and transmitted to the measuring
instrument, and signal data is sent to the controller if appli-
The optional IEEE 488 interface (GPIB) can only be factory-fit-
ted as it is necessary for this purpose to open the instrument and
break the guarantee seal.
cable. It is only possible to select settings prior to starting
the instrument. Once operation has started, it is no longer
possible to do so. Technical data as well as how to address
the interface is described in the manual of the R&S®HO880
interface.
We recommend using a National Instruments Adapter (NI-USB-
GPIB HS) as GPIB-USB adapter.
Fig. 9.2:
Type A and type B of
the USB interface
Remote Control
67