Star Network Modem
E70-DTU(433NW30-ETH)_User Manual
Chengdu Ebyte Electronic Technology Co., Ltd.
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filtering.
The short connection function is applied in the TCP Client mode. After the short connection function is enabled, when
sending data. If no data is received from the serial port or network port within the setting time, the connection will be
automatically disconnected. The short connection function is turned off by default, and the disconnection time can be set after
the function is turned on, the range is 2~255S.
5.2
Registration packet mechanism
In the network transparent transmission mode, users can make the module send registration packets to the server. The
registration packet is for the server to identify the data source device, or as a password to obtain server authorization.
E70-DTU(433NW30-ETH) has 4 registration packet mechanisms:
Sending MAC when connecting: The module will send the its own MAC address to the device when the connection is
established.
Sending user-defined data when connecting: The module sends a user-defined data to the device when the connection is
established
Each packet of data sending MAC: The module will add its MAC address in front of each frame of data sent.
Each packet of data sending user-defined data: The module will add its user-defined data in front of each frame of data
sent.
Sending a registration packet when establishing a connection are mainly used to connect to a server that requires
registration. Data-carrying registration packets refers to accessing registration packets at the head of data in sending data,
which is mainly used for protocol transmission. The user-defined data packet defaults to hexadecimal data (ASCII code
optional) and the maximum packet length is 40 bytes.
5.3
Heartbeat mechanism
In the network transparent transmission mode, users can make the E70-DTU(433NW30-ETH) module send heartbeat
packets to the server. Heartbeat packets can be sent to the web server or sent to the serial device, they cannot run at the same
time.
Network heartbeat pocket: The heartbeat packet is sent to the network, in the heartbeat transmission cycle, the module
sends heartbeat packet data to the network server to maintain the connection with the network server. It only runs in the TCP
Client and UDP Client modes
。
Serial data packet: In the set heartbeat sending cycle, the module sends heartbeat packet data to the serial port, users can
do corresponding processing after the serial port receives the heartbeat data.
In an application in which a server sends a fixed inquiry command to a device, in order to reduce communication traffic,
users can choose to send a heartbeat packet (inquiry command) to the serial device side instead of sending a inquiry command
from the server.
User-defined data packet defaults to hexadecimal data (ASCII code optional), E70-DTU(433NW30-ETH) module
supports custom heartbeat packet content up to 40 bytes
5.4
Overtime restart
Overtime restart (no data restart) function is mainly used to ensure long-term stability of E70-DTU(433NW30-ETH)
When the network port cannot receive data for a long time, or if the network does not receive data for a long time, the E70-
DTU(433NW30-ETH)will restart after exceeding the set time, thus avoiding the influence of abnormal conditions on the
communication. The normal working time of this function is set to 60~65535S, default 300S. When the setting time is less
than 60S, the default setting is zero, that is, the function is turned off.
