Ebyte E90-DTU 400SL30-ETH-V2, Руководство пользователя

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Chengdu Ebyte Electronic Technology Co., Ltd
E90-DTU(230SL22-ETH) User Manual
Copyright ©2012–2021, Chengdu Ebyte Electronic Technology Co., Ltd
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3.2.6KeepAlive function
Keep-Alive is the mechanism for detecting dead connections in a TCP connection. When the user does not send any data, the
"Keep-Alive" information is periodically sent on the TCP link to maintain the idle link, avoiding dead connections and consuming
unnecessary system resources. This setting is valid under TCP. Users can customize the Keep-Alive switch and other parameters.
keepalive parameter introduction
：
time
：
How many seconds after the TCP link does not receive data packet transmission to start the probe packet
；
intv
：
Time interval between the previous probe packet and the next probe packet
；
probes
：
The maximum number of probe failures. When the sniffing fails to this number, the TCP connection will be
disconnected.
。
3.2.7Timeout restart function
The timeout restart (no data restart) function is mainly used to ensure that the E90-DTU-(230SL22-ETH) works stably for a long
time. When the network port does not receive data for a long time, or the network does not receive data for a long time,
E90-DTU-( The 230SL22-ETH) will restart after the set time has elapsed to avoid anomalies affecting communication. The timeout
timeout can be set through the webpage. The normal working time of this function is set to 60~65535S, and the default value is 3600S.
0 is off, when the setting is out of range, it returns to the default value.
3.2.8Clearing the cache function
When the TCP connection is not established, the data received by the DTU will be placed in the buffer area. The
E90-DTU-(230SL22-ETH) receive buffer is 2Kbyte. When the TCP connection is established, the network cache data can be set or not
according to customer requirements.
The device has two buffer areas, which are the serial data buffer and the network data buffer. When the SOCKET clear cache
function is enabled, only the cache data of the relevant SOCKET link will be cleared, and the serial cache data will not be cleared.
3.2.9Link/ data transmission indication
Link indicates the status of the network connection. In TCP mode, when the network is not connected, the Link is off, and when
the connection is established, the Link is always on. The Link indicator is always on in UDP mode.
The other one is the data transmission indication, showing the transmission status of the DTU. When there is no data transmission
on the DTU, the data transmission indicator is off. When there is data transmission on the DTU, the flashing indicates that the period is