Instructions

Page 56
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PS 9000 3U Series
3.5 Remote control
3.5.1 General
Remote control is principally possible via any of the built-in interface ports USB, Ethernet/LAN, analog or optional
GPIB. Important here is that only the analog or any digital interface can be in control. It means that if, for example,
an attempt were to be made to switch to remote control via the digital interface whilst analog remote control is
active (pin REMOTE = LOW) the device would report an error at the digital interface. In the opposite direction a
switch-over via pin REMOTE would be ignored. In both cases, however, status monitoring and reading of values
are always possible.
3.5.2 Control locations
Control locations are those locations from where the device can be controlled. Essentially there are two: at the
device (manual operation) and outside (remote control). The following locations are dened:
Displayed location Description
- If neither of the other locations is displayed then manual control is active and access from
the analog or digital interfaces is allowed. This location isn’t explicitly displayed
Remote Remote control via any interface is active
Local Remote control is locked, only manual operation is allowed.
Remote control may be allowed or inhibited using the setting “Allow remote control” (see „3.4.3.1. Menu “General
Settings”“). In inhibited condition the status “Local” will be displayed in the status area (lower half, middle) of the
display. Activating the inhibit can be useful if the device is remotely controlled by software or some electronic device,
but it is required to make adjustments at the device or deal with emergency, which would not be possible remotely.
Activating condition “Local” causes the following:
• If remote control via the digital interface is active (“Remote”), then remote control is immediately terminated and
must be reactivated at the PC once “Local” is no longer active
• If remote control is via the analog interface is active (“Remote”), then remote operation is only interrupted until
remote control is allowed again, because pin REMOTE continues to signal “remote control = on”. Exception: if
the level of pin REMOTE is changed to HIGH during the “Local” phase
3.5.3 Remote control via a digital interface
3.5.3.1 Selecting an interface
The device only supports the built-in digital interfaces USB and Ethernet (standard models) resp. GPIB (optional).
For USB, a standard USB cable is included in the delivery, as well as a driver for Windows on the USB stick. The
USB interface requires no setup.
The Ethernet interface typically requires network setup (manual or DHCP), but can also be used with its default
parameters right from the start.
The GPIB interface requires you to select a unique address in case it is connected to other GPIB bus members.
3.5.3.2 General
For the network port installation refer to „1.9.8. Ethernet port“.
The digital interface require little or no setup for operation and can be directly used with their default conguration.
All specic settings will be permanently stored, but could also be reset to defaults with the setup menu item “Reset
Device”.
Via the digital interface primarily the set values (voltage, current, power) and device conditions can be set and mon-
itored. Furthermore, various other functions are supported as described in separate programming documentation.
Changing to remote control will retain the last set values for the device until these are changed. Thus a simple
voltage control by setting a target value is possible without changing any other values.
3.5.3.3 Programming
Programming details for the interfaces, the communication protocols etc. are to be found in the documentation
“Programming Guide ModBus & SCPI“ which is supplied on the included USB stick or which is available as down-
load from the manufacturer’s website.