Ebyte E90-DTU(433L30E) User Manual page 12

E90-DTU(Ethernet) wireless transceiver
6.4 Overtime restart
Overtime restart (no data restart) function is mainly used to ensure long-term stability of E90-DTU. When the network
port cannot receive data for a long time, or if the network does not receive data for a long time, the E90-DTU 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.
6.5 TCP multi-connection function
TCP multi-connection function is mainly to solve that in the TCP Sever mode, the user has multiple clients to connect
E90-DTU and send and receive data at the same time. When E90-DTU is used as a TCP Server, up to 6 connections can be
established at the same time, the TCP Server sends data to multiple (up to 6) TCP clients on the connection at the same time.
When the number of established connections exceeds six, the connection established at the beginning will be actively
disconnected, that is, the old connection will be kicked off.
6.6 Clearing cached data
When the TCP Client connection is not established, the data received by the serial port will be placed in the buffer area,
the E90-DTU serial port receive buffer is 400 bytes. When the connection is established, the serial port buffer data can be
set whether to clear according to customer needs.
6.7 Link and data transfer instructions
Link indicates the network connection status of the module. In TCP mode, when the network is not connected, the link
goes out. When the connection is established, the link is always on. Link indicator is on in UDP mode.
The other is the data transmission indication, which shows the data transmission status of the serial port of the module.
When there is no data transmission on the serial port, the data transmission indicator is extinguished. When there is data
transmission on the serial port, the flashing indicates that the period is 60ms and the indicator lit 10ms.
Chengdu Ebyte Electronic Technology Co., Ltd.
E90 series user manual
11