1. The main advantages of the RS485 serial server communication technology 1. Simple wiring: only 2 wires are needed, and now the shielded wire interface of the network cable is generally used.
2. Long communication distance: RS485 adopts differential mode communication method, the communication distance can reach 1.2KM, which is farther than RS232 communication distance, generally a few meters.
3. It can support multi-machine network communication: compared to RS232 which can only connect one-to-one, RS485 can mount multiple terminals on the line, and realize multi-machine communication by polling.
Second, the key technology of RS485 to Ethernet serial server RS485 To seamlessly upgrade to Ethernet, you need to seamlessly combine Ethernet technology and RS485 communication protocol for transition.
Its key technologies include: 9-bit technology, framing technology, master-slave mechanism, etc.
1.9-bit technology In 485 mode, users can send 9-bit data. And sometimes the 9th bit is used to indicate whether it is a data frame or an address frame. Since Ethernet is 8-bit data during network communication, there is no space for 9-bit. Xunji can convert the 9-bit data format of RS485 to 8-bit data of Ethernet through the protocol.
2. Framing technology Framing is a key technology that appears in serial to Ethernet (including RS485 to Ethernet), that is, when the serial server receives data from the serial device, when will the data be packaged and forwarded to Ethernet, need The user sets a parameter called longer packet length and longer packet interval.
Xunji serial server can make your serial device networked immediately. The serial port server can support the virtual serial port protocol, so that you do not need to change the original PC software, provide transparent data conversion between the serial port and the Ethernet port, and support DHCP and DNS. It is a full-duplex serial port server with no packet loss.
Shenzhen Xunji RS232, RS485, RS422 three-in-one serial port, RS232, RS485, RS485, RS422, RS232RS, 485 and other serial port combination of a full range of products. In addition, there are multiple serial ports and serial port servers that can be secondary developed. Can meet all applications. Serial server is widely used in access control / attendance, medical application, remote monitoring, computer room management and substation management.
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