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23
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NOVATEK-ELECTRO
ЕТ-485
bottom of the page, in order to delete unit from Overvis. This ensures that new unit will be used only by the
users who have right to do it.
connect to ET-485 with activation code, using instruction from the site of Overvis system.
Figure B.4
– Consecutive readdressing
For connection to other clients in ACC mode use the following recommendations:
the client should have a static IP address or a registered host name;
the client should open a familiar port which is not used by other applications (factory setting ET-485
– 20502,
other port can be used) in order to receive ACC from ET-485 units;
the client can be simultaneously connected with several ET-485 units, whose IP addresses and ports can be
used for identification during connection only for a limited time. Therefore, identification should be performed another
way, for example, according to one of the following ways:
a)unique MAC address is used for identification. The client saves MAC address of each connected unit, and
when the unit is required it either acts according to the program, set for each MAC address, or requires the user to
give MAC address which should worked with, etc.;
b)client uses unique MAC address of the unit for its identification. In order to provide the access for the user, the
unique activation code is given to each unit (herewith, Modbus write protection mode should be disabled). The user is
offered once to enter the activation code of the necessary unit. The code is available for reading while ET-485 is
being set through WEB interface. After the user enters a code,
an appropriate unit is added to the list of user’s units.
This way provides extra safety in the multiuser system;
as ACC protocol is based on Modbus TCP, the client should use Modbus address of ET-485 unit, in order to
perform identification. Modbus address of ET-485 can be identified, for example, in the following ways:
a)client holds set Modbus address of ET-485 for each MAC address of the unit;
b)client checks some range of MAC addresses, for example, 111-121. If type and version of ET-485 firmware
cannot be read at any address, the client closes connection;
c)the option of automatic sending of MAC address to the ACC client is used (factory setting - enabled, can be
disabled for interoperation). The client receives Modbus response with MAC address of the unit after its connection,
herewith, Modbus address is also contained in this response. This way speeds up and simplifies address
identification, and is recommended to use with Overvis system;
