Ethernet to serial port Because the serial port is simple, convenient and easy to use, the serial port is used as the transmission line in most data transmission lines. But once the various devices that are far away need to be managed uniformly, data transmission must be carried out through the Internet.
The Ethernet to serial port module is a convenient and stable solution for embedded devices, microcontrollers, and IoT acquisition systems to access networks based on the TCP/IP protocol. One end of it is an RS232/RS485 serial port, and the other end is an RJ45 network port that can be connected to a network cable. The serial port side does not require any more operations. It can directly send the data to the serial port of the module and then send the data to the designated network server, realizing the embedded protocol conversion of TCP/IP and providing two-way Ethernet transparent transmission from the serial port to the TCP/IP network. .
The key technology of Ethernet to serial port – serial port framing technology
Serial data can be sent continuously, while Ethernet data is sent in packets. This is related to the issue of how long the serial port data is packaged and sent as an Ethernet data packet.
Data packet length: The longest Ethernet data packet is more than 1500 bytes, so after the serial port to network port transponder receives 1500 bytes, it must be packaged and sent. Users can set the upper limit of this packet length.
Packet interval: In addition to the data packet length as the serial port framing rule, a more logical method is through the data packet interval. When the serial port to TCP IP transponder finds an idle time of T milliseconds in the serial port data stream, it is considered that the previously received serial port data can be sent as an Ethernet data packet. T here is the packet interval set by the user.
Zongheng Intelligent Control’s Ethernet to serial port module supports multi-channel Socket connections, DHCP, DNS, and serial port configuration. It is powerful and easy to use. It also supports Modbus RTU /TCP, MQTT, registration package/heartbeat package and other functions. It is widely used in meteorology, water conservancy, security, building automation, intelligent transportation, power systems, environmental monitoring, industrial automation and other fields.