Interface Cards - Elektro-Automatik Serie EL3000A Benutzerhandbuch

Handling the device

9. Interface cards

General
The electronic load supports various interface cards. All are
galvanically isolated up to 2000V.
The digital interface cards IF-R1(RS22), IF-C1(CAN) and
IF-U1(USB) support a uniform communication protocol. The
IEE/GPIB card IF-G1 uses a text based protocol according
to the SCPI standard. All cards can be used to monitor and
control 1 to 0 units by a PC, whereas the total number of
devices using IEEE is limited to 16 by the bus standard.
Setup for the different cards
The cards require different setup parameters that need to
be configured at least once. They are described in section
„7. Device configuration".
Further information and technical specifications of the inter-
face cards can be found in their user instruction guide.
Specialties
The control of the electronic load via one of the interface
cards and the supplied LabView VIs follows the operating
conditions and nominal values of the device. Set values are
checked for plausibility and are corrected if necessary, or
forced to nominal values.
LabView
We provide ready-to-use LabView VIs for the interface cards.
These do not support all of the features of the electronic load,
but are constantly under development and enhancement.
New versions can be downloaded from the download section
of the EA web page (www.elektroautomatik.de).
Programming in other environments
The implementation of the digital communication interfaces in
other IDEs than LabView is generally possible. The commu-
nication protocol follows no certain standard and represents
only the lowest level of the communication. At this level it
provides lower safety against wrong setup and wrong set
values, which may lead to a misbehaviour of the addressed
unit. A strict adherence of the guidelines is mandatory.
Details about the communication protocol can be found in
the user instruction guide of the interface cards.
Application examples
The following figures show only some of many possible ap-
plications when controlling one or multiple electronic loads
by a PC. The same applies for mixed configurations with
power supplies.
The configuration shown in figure 23 can also be used for
RS22 with the interface card IF-R1, but with limitations. The
LabView VIs currently only support one unit via RS22.
© 2008, Elektro-Automatik GmbH & Co. KG
Figure 22
Figure 2
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