~ 14 ~
ET-485
NOVATEK-ELECTRO
When a request for client connection to the Modbus TCP port is received, the unit starts verifying the client's IP-address
(if connection filtering over IP is activated). If this address does not correspond with the preset value, the connection is
rejected. Otherwise, the unit starts checking the list of available connections. In case of no available connections, the unit
(depending on the configuration) can connect a new client instead of the previously connected one (if no activity of the client
was registered over a set period of time, or if the connection is maintained longer than prescribed).
When a client is connected to a Modbus TCP port, the unit adds it to the internal list of clients (the number of clients
cannot be greater than provided under specifications). In case of any request from the client, if the request is addressed to ET-
485, the unit processes it and provides a response to the client. If the request is addressed to another unit, the unit sends the
request into the Modbus network and waits for a response from a unit on the network (“
RS-485
” indicator is activated in this
case). “
RS-485
” indicator is deactivated if the data is received or the waiting time is out. If the response is provided in a proper
format, ЕТ
-485 transmits it to the client that requested it. In case of any format errors, an “Error” indicator shall become
activated for 0.5 seconds and no response is provided to the client. If no response is provided, ET-485 generates and
transmits the proper Modbus exemption code to the client (code 11).
7. SETTING
7.1 General information
Configurable parameters are described in section 7.2. All parameters are saved at the power off.
Unit configuration can be done in two ways:
through WEB-interface, see Section 7.3;
through Modbus-interface, see Section 7.4;
WARNING! ANY CHANGES IN UNIT CONFIGURATION MAY RESULT IN BLOCKING OR OBSTRUCTION WHILE
TRYING TO REACH THE UNIT OVER THE NETWORK.
In this case, all parameters should be factory reset (see Section 3.2).
