~
22
~
ЕТ-485
NOVATEK-ELECTRO
ET-485 units are connected according to one of the above mentioned diagrams.
Figure B.3
– Connection of two independent Modbus networks to the third network
Those units, to which an access should be provided without specifying their IP addresses, are set for active
connection to the Internet. In the course of operation in ACC mode, ET-485 automatically maintains connection to the
client. If automatic sending of unique MAC address is enabled, after connection ET-485 shall transfer MAC address as
Modbus response (herewith, query is not sent by the client). Then ET-485 awaits queries from clients as well as from
other Modbus TCP clients. Since ACC mode is based on Modbus TCP with some changes (ET-485 connects the client
and then functions as Modbus server), the client should maintain ACC mode. For example, Overvis system (Internet
address "overvis.com") can be used to access ET-485.
Overvis is the system for monitoring and remote control of the production processes. Overvis allows data reading
of units, including ET-485 and devices connected to them via RS-485, carrying periodic readouts within 24 hours,
automatic saving data in the base, convenient data overlooking, receiving alert messages about incidents via SMS or
E-Mail.
Overvis system maintains ACC mode, used in ET-485, acting as a data collection server of many simultaneously
connected units and providing access to the data of units, connected in ACC mode, only by the permission of ET-485
owner.
Factory settings of ET-485 are ready for connection to Overvis, herewith, ACC mode is off and should be
remotely activated by the user.
According to setting instructions for ET-485 through WEB interface (p. 7.3) for connection of a new unit to the
Overvis system in ACC mode it is necessary to:
set ET-485 for access to the Internet and enable ACC mode;
disable write protection mode, if necessary to enable other protection modes (filters, passwords);
Note - the Overvis system, while connecting ET-485 unit to it in ACC mode, makes a record in ET-485 of
the activation data in appropriate ACC identification control registers. Therefore, while connecting ACC to
the Overvis system, Modbus write protection mode in ET-485 unit should be off. Other protection modes
(filters, passwords) do not affect ACC and can be used with it.
check on the parameter page that ACC is connected and activation code is received.
Note - if on the parameter page it is pointed for new unit, connected to Overvis through ACC, that
connection is activated, for reasons of safety it is necessary to press the button “Reset activation” at the
