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Device communication
10. Device communication
10.1 Ethernet interface
The Ethernet interface can be used for communication with Modbus, web server and
BCOM.
10.2 BCOM
BCOM is intended for communication between Bender devices via Ethernet.
In order to guarantee that all devices are able to communicate via BCOM, all devices must
have the same system name. Devices can be organised in subsystems. Each device requi-
res an individual device address.
For more information regarding BCOM, refer to the BCOM manual (D00256) at
www.bender.de/en/service-support/downloads
10.3 Modbus/TCP
Modbus is an international widely used protocol for data transfer between devices.
All measured values, messages and parameters are stored in virtual register addresses.
Data can be read at a specific register address with a read command. With a write
command, data can be written to a register address. The register addresses of the indi-
vidual measured values und parameters can be found in the manual "iso685–D Annex A"
with the title "ISOMETER® iso685 device family - Modbus settings" at
A maximum of 5 TCP/IP connections can be used simultaneously.
When address 0 has been set for the communication via BCOM the device
can be accessed via the network (e. g. for parameter setting, etc.) but it
cannot communicate with other devices.
In order to be able to parameterise the device externally via Modbus, the
menu item "Allow" must have been set in the "Write access" menu.
10.4 Web server
The ISOMETER®s of the isoxx685 device family feature an integrated web server which
displays the device data via a web browser. This way, measured values of the ISOMETER®s
can be read out and parameterised.
Preferably use the following browsers:
The web server is accessed by entering the IP address of the ISOMETER® into the web
browser. (Example: http://192.168.0.5) The current IP address of the respective ISOME-
TER® can be found in the device menu at
"Info" -> "Ethernet"
10.4.1 Conventions
10.4.2 Functions
The web server offers the following functions:
• Visualisation
– Display of device information (e.g. device type, software version, etc.)
– Display of present device settings
– Display of alarm messages
– Display of the Modbus information of the individual parameters
– Display of the interfaces in use
– Overview of the present measured values
– Detailed graphic representation of the insulation resistance (isoGraph)
– Fast and simple visualisation without any programming
• Parameter setting
– Easy and fast parameterisation of the device
– Easy assignment and editing options of device texts
• Maintenance
– Data storage of specific events for fast support by the Bender service
TCP connections
A maximum of 5 TCP/IP connections can be used simultaneously.
Only
one
device may access the web server at a time. If several devices try
to access the web server at the same time, this may result in timeouts.
Write access
The write access is deactivated by default in the device menu (= Deny). To
be able to set parameters via the web server, the write access must first be
activated in the device menu (= Allow).
