Generex CS141 Series - Page 23

Date: 2021-08-17
Copyright of the European Union is effective (Copyright EU) (c) 2021 GENEREX Systems GmbH, Hamburg, Germany, All rights reserved
TEL +49(40)22692910 - EMAIL generex@generex.de - WEB www.generex.de (This and all other product datasheets are available for download.)
23
Webserver
to increase security, the configuration by using SSH
console is no longer allowed, the integrated web server is
the only communication option for configuring the CS141.
Disabling HTTP will restart the device without starting the
web interface. By disabling, no further configuration is
possible. The CS141 therefore issues a direct alert before
disabling this option. Ensure your configuration is done
perfectly - Disabling the HTTP Server cannot be
withdrawed without physical access to the device.
Why it is possible to deactivate this server?
In some cases, it is necessary to ensure a minimum of possible interactions. The CS141 takes care even in this seldom cases:
Depending on its configuration only additional sftp-access is possible in order to download data logs. Therefore, the admin
password can be known without consequences of network security.
Note:
The rescue system on the CS141 has not only saved the last firmware, but also the last configuration before your update.
If you intend to deactivate the http functionality, it is recommended to perform a firmware update before this last configuration
step:
By doing it, you will be able to access the system by its build-in rescue mode.
SNMP
The Simple Network Management Protocol (SNMP) is a network protocol developed by the IETF to monitor and control network
elements from a central station.
The protocol controls the communication between the monitored devices and the monitoring station. Thereby SNMP describes
the structure of the data packets that can be sent as well as the entire communication process.
It was designed to ensure any network-capable device can be implemented into monitoring systems.
Possible tasks of network management using SNMP include:
- monitoring of network components,
- Remote control and remote configuration of network components
- Error detection and error notification.
With its simplicity, modularity and versatility, SNMP has become the standard supported by most management programs as well
as endpoints.
If you want to use SNMP in your network, leave the check mark active for this function.
Modbus
Fieldbuses are bus systems that connect field devices like sensors or actuators inside a complex operating scenario to allow
communication to an according full-automated managing system.
If several communication partners send their information over the same line, it is necessary to ensure communication about
fixed rules:
- who (identifier)
- what (measure, command) and
- when (initiative)
To ensure this communication, there are standardized protocols to be used.
Some historical facts about Modbus:
The Modbus protocol was launched in 1979 by Gould-Modicon for communicating with its programmable logic controllers and
has become an unofficial standard for industrial usage due to its open protocol standard.
Since 1999, fieldbuses have been standardized worldwide in the IEC 61158 standard (Digital data communication for
measurement and control - Fieldbus for use in industrial control systems). The second generation of fieldbus technology is
based on real-time Ethernet.