Ea Elektro Automatik EA Elektro-Automatik EA-EL 9750-50 Electronic Load 0 - 50 A 0 - 750 Vdc 0 - 3000 W / 4800 W pk 33200253 데이터 시트

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33200253

Instruction Manual

EL 9000 A Series

Date: 11-16-2011

Remote control

9. Interface cards

General
The electronic load supports various interface cards.
The digital interface cards IF-R1(RS232), IF-C1(CAN)

and IF-U1(USB) support a uniform communication proto-

col. The IEEE/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 15

by the bus standard.
The network card IF-E1b, 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 with the USB card IF-U1.

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.

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 23 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.

Figure 22

Figure 23