Hameg HM8115-2 Manual page 38

S e r i a l i n t e r f a c e
8 Interface
The HM8115-2 is well equipped for use in automated test
systems. An optcoupler-isolated USB/RS-232 interface is
standard. The respective drivers are available on the enclosed
Product CD or can be downloaded at http://www.hameg.com.
For using the USB interface you don´t have to change the
configuration.
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 serial connection between the HM8115-2 and a PC (COM
port) any standard cable with 9 pin submin D on both sides may
be used, provided it is shielded and < 3 m.
If a PC has a 25pin connector an adapter 25 to 9pin
has to be inserted, only 3 wires are used.
Connections
POWER METER
Pin name / function
2 Tx Data / output
3 Rx Data / input
5 Ground
RS-232 Interface parameters
N, 8, 1, Xon-Xoff:
(No parity bit, 8 data bits, 1 stop bit, Xon-Xoff.
1200 or 9600 Baud
Changing interface parameters
Only the baud rate can be selected as either 1200 or 9600 baud.
In order to do this proceed as follows:
– Turn off the HM8115-2.
– Turn the instrument back on.
– Press the lefthand FUNCTION pushbutton
– Press the lefthand pushbutton
until the LED WATT lights up.
This new baud rate will be stored permanently unless changed.
38
Subject to change without notice
PC COM Port (9poles)
Pin name / function
2 Rx Data / input
3 Tx Data / output
5 Ground
10
and keep it depressed
10
9 Software
9.1 Installation
For the installation of the software HM8115-2 please start the
file setup.exe and follow the instructions of the installation
assistant.
9.2 The program
The software HM8115-2 was developed for the programmable
Hameg Instruments Power Meter HM8115-2. The power meter
can be connected with the PC by 3 different interfaces: Serial /
USB interface (standard) HO820 and GPIB interface (HO880). If
the USB interface is used, a virtual COM port has to be instal-
led. The COM port driver can be downloaded from our website
www.hameg.com
Picture 2.1: User interface
IMPORTANT WITH GPIB!
This software only supports National Instruments
GPIB cards and such cards, that are fully compa-
tible with them.
The program is devided into 4 parts (Settings, Control panel,
Measurement, Instruction), which are described in the following:
9.2.1 Settings
Six different parameters can be set:
Interface: In this field the interface can be selected,
which is used for the connection to the PC.
Available settings: Com1-4, GPIB
GPIB address: Setting of the GPIB address the HM8115-2
(only with GPIB)
Beep enable:
Activation/Deactivation of acoustic signals
Show data traffic: This option offers the possibility of letting the
data traffic in the editing fields 'Command'
and 'Answer' indicate.
Device locked:
With this option activated the instrument only
can be operated by software. The control
elements are locked!
Autotransfer:
With this button the automatic data transfer
between PC and HM8115-2 can be turned on