Serial Interface - Rohde & Schwarz Hameg HM8115-2G Handbuch

S e r i a l i n t e r f a c e

Serial Interface

The HM8115-2 is well equipped for use in automated test sy-
stems. An optcoupler-isolated RS-232 interface is standard.
Interface parameters
N, 8, 1, Xon-Xoff:
(No parity bit, 8 data bits, 1 stop bit, Xon-Xoff.
A terminal program like HyperTerminal may be used for da-
ta transmission. After performing all settings in the terminal
program press the ENTER key once prior to sending the fi rst
command to the HM8115-2
Baud rate
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.
Serial interface
15
The RS-232 interface connector is located on the rear panel
(9pin submin D). The interface allows the transmission of data
from the instrument and its remote control.
F o r t h e c o n n e c t i o n b et w e e n t h e HM 8115 -2 a n d a
PC (COM port) any standard cable with 9pin 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.
HINT
Connections:
POWER METER
Pin name / function
2 Tx Data / output
3 Rx Data / input
5 Ground
38
Subject to change without notice
•
•
and keep it depressed
16
17
PC COM Port (9poles)
Pin name / function
2 Rx Data / input
3 Tx Data / output
5 Ground
Software
1. Installation
For the installation of the software HM8115-2 please start the
fi le setup.exe and follow the instructions of the installation
assistant.
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
interface (standard), USB interface (HO870) and GPIB interface
(HO880). If the USB interface is used, a virtual COM port has
to be installed. 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 cards, that are fully compatible
with the National Instruments cards.
STOP
The program is devided into 4 parts (Settings, Control panel,
Measurement, Instruction), which are described in the follow-
ing:
2.1 Settings
Six different parameters can be set:
Interface: In this fi eld 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 traffi c: This option offers the possibility of letting the
data traffi c in the editing fi elds 'Command'
and 'Answer' indicate.
Device locked: With this option activated the instrument on-
ly can be operated by software. The control
elements are locked!