45
EN
Instruction Manual
EL 9000 HP Series
Date: 05-31-2011
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(RS232), IF-C1(CAN)
and IF-U1(USB) support a uniform communication proto-
col. 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 30 units by a PC, whereas
the total number of devices using IEEE is limited to 16
by the bus standard.
The network card IF-E1, on one hand, offers the same
text based SCPI protocol like with the IEEE card. On
the other hand, the card features an additional USB port
which can used with the binary communication protocol
as stated above.
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
interface cards can be found in their instruction manual.
Specialties
The control of the electronic load via one of the interface
cards and the supplied LabView VIs follow 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.
Programming in other environments
The implementation of the digital communication inter-
faces in other IDEs than LabView is generally possible.
The communication protocol follows no certain standard
and represents only the lowest level of the communica-
tion. At this level it provides lower safety against wrong
setup and wrong set values, which may lead to a misbe-
haviour of the addressed unit. A strict adherence of the
guidelines is mandatory.
Details about the communication protocol can be found
in the instruction manual of the interface cards.
Figure 16
Figure 17
Application examples
The following figures show only some of many possible
applications when controlling one or multiple electronic
loads by a PC. The same applies for mixed configurations
with power supplies.
The configuration shown in figure 17 can also be used
for RS232 with the interface card IF-R1, but with limita-
tions. The LabView VIs currently only support one unit
via RS232.
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