Instructions
ECL Comfort 210 / 310, communication description
5.
Modbus/TCP, Ethernet description
The ECL 310 has a Modbus/TCP communication interface that
allows the ECL to be connected to an Ethernet network. This
allows remote access to the ECL 310 controller based on
standard communication infrastructures.
For specific details, please consult the Modbus guide
Modbus_Messaging_Implementation_Guide_V1_0b.pdf
which can be found on
http://www.Modbus.org/
Specific implementation details:
The ECL 310 listens for communication on TCP port 502.
Opened Modbus/TCP connections are closed by the ECL 310
controller after approximately 75 seconds without any data
exchange.
If multiple controllers are present on the same network they
must use different IP addresses.
If multiple controllers are present on a single Internet IP
address, a router/firewall must perform port translation so
that it is possible to distinguish the controllers by port
number. See Figure 5-1 for an example.
Note that not all routers support this and some ISPs (Internet
Service Providers) do not allow customers to reconfigure the
routers.
Default IP address is 192.168.1.100
Security Note:
The Modbus/TCP implementation guide does not specify a
specific security model.
The ECL 310 controller does not use any form for access control
restriction and it is therefore strongly advised to only use it on a
secure local network where a router/firewall provides security
to other local networks or the internet. In most routers it is
possible to set simple access restrictions for which kind of
internet traffic that are allowed to reach the ECL 310.
Modbus/TCP communication is not affected by the removal of
the key from the ECL controller. It is still possible to change all
settings through communication even if the key has been
removed in order to prevent this!
5.1.1
Recommended security measures
Place the ECL310 behind a router. Set rules in the firewall that
limits the port forwarding range to the ECL to what is needed.
If possible limit the number of IP addresses that can
communicate with the ECL310 to a few trusted addresses.
5.2
Static IP address
The ECL 310 uses a static IP address as default. DHCP is an
option for software version 1.30 and higher. When installing
multiple ECL 310s on an Ethernet network then be sure to
give them unique IP addresses, as they will all have the same
default IP address.
Remember also to change the gateway address, net mask and
DNS addresses if needed.
It is necessary to reset the controller when internet settings
have been changed in order for the changes to take effect for
software versions lower than 1.30.
It is recommended to only change Ethernet settings directly at
the ECL or via the Modbus RS-485 or USB interface.
Danfoss District Energy
VI.LG.V3.02
DEN-SMT/DK
8