Lenze PC-based automation - Manual (Page 50)

Control technology| System manual
Remote maintenance and diagnostics
Redirecting screen contents/entries
50
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DMS 1.3 EN - 02/2011
7.5 Redirecting screen contents/entries
Comfortable programs for remote maintenance allow for a complete redirection of the en-
tire screen contents. Moreover, all keyboard entries or mouse movements are transmitted
from the local PC to the remote PC. Thus you can operate the remote PC as if you would be
directly in front of it. However, the quality of the remote connection is decisive as the speed
of the presentation of the screen contents depends strongly on it. A bad connection may
render the operation of a program using the mouse impossible since you cannot track the
movements of the mouse pointer. In such cases, you can use the command line-based pro-
tocols as FTP and Telnet, depending on the function to be executed.
The use of a screen redirection requires an existing local connection or remote connection.
For redirecting the screen contents, the following programs are available, depending on
the device type:
 EL100:
– VNC (see manual EL100)
 EL 1800-9800, CS 5800-9800, CPC 2800:
– Cerdisp/Cerhost
7.5.1 Virtual Network Computing (VNC)
Virtual Network Computing (VNC) is a software developed by Olivetti & Oracle Research
Laboratory (from 1999 AT&T), which shows the screen content of a remote computer (with
the VNC server software running) on a local computer (with the VNC viewer software run-
ning) and transmits the keyboard and mouse movements from the local computer to the
remote computer. Alternatively, an "only read" mode is possible, where local entries have
no impact on the remote computer.
VNC has an open source licence which means that the source code is free of charge for in-
terested developers so that further developments are allowed. Thus, various VNC versions
are available in the internet.
The VNC server is already installed in the devices of the HMI series EL100 by default. The
Engineering PC requires the VNC viewer software. It can be downloaded from the down-
load area of the Lenze homepage AKB and is enclosed to the CD which is supplied with the
devices.
7.5.2 Cerdisp/Cerhost
Microsoft provides the software combination Cerdisp/Cerhost for redirecting screen con-
tents and keyboard and mouse entries.
 The Cerdisp is installed on the Industrial PC. The IPCs of the
EL 1800 series are supplied completely installed.