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Subject to change without notice
R e m o t e C o n t r o l
8 Remote Control
If the instrument is being addressed via the interface (remote
control), the LED of the Remote button will light up white. Press
the Remote button in order to return to local control. This will
not work, if the instrument’s local control is locked out. In this
case the instrument can not be operated via the front panel.
8.1 Dual Interface HO820 (USB/RS-232)
The dual interface HO820 provides an USB and a RS-232 in-
terface, which are both galvanically isolated. Optional a GPIB
interface (HO880) is available. We recommend the installation
ex factory.
RS-232 Interface (9 pin):
The RS-232 interface uses a standard 9pin subD connector.
This bidirectional interface allows the exchange of measure-
ment parameters between an external device (DTE, e.g. a pc
with suitable measurement software) and the HM8118 (DCE).
Also commands can be transmitted and data read. The chapter
„Reference listing of commands“ contains a survey of available
commands. A direct link between the serial port of a pc and the
instrument’s RS-232 interface may be established by a standard
9 conductor shielded cable (1:1); only shielded cables of max.
3 m may be used.
Pin assignment RS-232:
The HAMEG RS232 interface is arranged as a 9-pole D-SUB
jack. This bidirectional interface is intended to send and recei-
ve setup parameters, data and remote commands from a PC
(serial port) to the HAMEG device. A connection to the PC can
be established with a 9-pole, shielded (1:1 wired) cable with
D-SUB plugs on each end.
Fig. 8.1: Pin Assignment RS-232
The pin assignment:
2 Tx Data (Data from the HAMEG device to the PC)
3 Rx Data (Data from the PC to the HAMEG device)
7 CTS Ready to send
8 RTS Ready to receive
5 Ground (Reference potential connected via the HAMEG
instrument of safety class I with the line cord and thus to
the safety earth of the wall outlet)
The maximum voltage swing at the terminals Tx, Rx, RTS and
CTS is ±12 V. The standard RS-232 parameters are:
Oscilloscopes:
8-N-2 (8 Data bits, no parity bit, 2 stop bits)
System devices:
8-N-1 (8 Data bits, no parity bit, 1 stop bit)
RTS/CTS-Hardware protocol: None
These parameters may be set or changed at the instrument.
USB interface:
The interface is equipped with a Type B female connector. For
direct connection with a host controller or an indirect connec-
tion via a USB hub a USB cable is required which is equipped
with a Type B connector at one end and a Type A connector at
the other side.
You do not have to change the configuration of the instrument.
If required, the baud rate can be changed. Connect the HM8118
with your PC using an USB cable and install the USB drivers as
described in the manual of the interface HO820.
Driver Installation HO820:
Connecting the instrument with the PC for the first time, the
operating system answers “Found New Hardware”. In addition
the “Found New Hardware Wizard” is displayed. The USB Driver
is located on the CD included in delivery or in the download area
on our website www.hameg.com.
8.2 IEEE-488 (GPIB) interface HO880
IIt is only necessary to set the GPIB address on the rear panel
and to connect the instrument to a pc with a GPIB cable. Settings
are only possible before the instrument is started, this is not
possible during operation. Technical details and addressing of
the interface you can find on the CD included in delivery or in
the download area on our website www.hameg.com.
8.3 Communication
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. A detailed instruction how to setup a basic
communication using HyperTerminal is available at the HAMEG
Knowledge Base at http://www.hameg.com/hyperterminal.
For the Remote Control the LCR bridge HM8118 uses SCPI
(= Standard Commands for Programmable Instruments) for
remote control. Remote control is possible via the built-in dual
interface USB/RS-232 (options: IEEE-488). This allow access
to nearly all functions which are available in the manual mode
on the front panel.
Fig. 8.2:
Typ A and Typ B of the
USB-Interface
Typ A
Typ B
Summary of Contents for HM8118
Page 1: ...P r o g r a m m a b l e L C R B r i d g e H M 8 1 1 8 Handbuch Manual Deutsch English...
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Page 58: ...58 Subject to change without notice C o m m a n d r e f e r e n c e N o t e s N o z i z e n...
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