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              The definition of Ethernet cable to the M12X-coded connector
There are many different protocols for connecting M12 to Ethernet. Some common scenarios are:
1.EtherNet/Ip
2.ProfiBus
3InterBus
4.CANopen
5.ProfiNet
6.DeviceNet
8.EtherCAT
9.Sercos
10.Vavan
11.SFC-Interface
12.CC-Link
Commonly used physical interface types are RJ45, RJ45, RJ45, M12 A-coded,B-coded,D-coded,X-coded, M12 A-coded,B-coded,D-coded,X-coded, metal assembly M12 A-coded,B-coded,D-coded,X-coded.The use of standard CAT5 / CAT5E/CAT6 / CAT6A/CAT7 wire, 10 gbit/s 4 pairs of data transmission.
This article focuses on the protocol of Ethernet/IP Ethernet connection M12 X-Coded 8-Pole.

The implementation of Ethernet /IP protocol
1. Hardware
1) Adopt some interface boards that have already been designed.There is basically no need to care about the content of hardware. After the interface is inserted, the software equipped by the manufacturer can be used for Ethernet /IP communication.
2) MCU with embedded Ethernet /IP protocol stack.It is also necessary to design the peripheral circuit of the MCU, and the function of the MCU can be extracted from the pins to carry out Ethernet /IP communication.
3) Adopt the interface module embedded with Ethernet /IP protocol stack;Similar to scheme 2), the corresponding hardware circuit needs to be designed, and the interface module needs an MCU to master it before Ethernet /IP communication can be carried out.
4) Adopt gateway.It is similar to the interface board card. After the interface is inserted, the software equipped by the manufacturer can be used for communication. The characteristic is that it communicates between protocols, not for Ethernet /IP protocol alone.

2. Software
Integrate Ethernet /IP protocol stack into the MCU, that is, refer to the Ethernet /IP protocol document, write the code into the MCU by yourself, or buy the corresponding code from the software manufacturer and transplant it into the MCU.This allows for further development of Ethernet /IP devices.

Ethernet/IP Ethernet M12 male connector,8-pole, x-coded RJ45PLUG
M12X-coded        RJ45         Signal           wire colors
   1               1       TX+/POE1(D1+)    White Orange (WH/OG)
   2               2       TX/POE1(D1-)     Orange (OG)
   3               3       Rx +/POE2(D2+)   white green (Wh/Gn)
   4               6       Rx -/POE2(D2-)   green (Gn)
   5               7       POE1(D4+)        white brown (Wh/Bn)
   6               8       POE1(D4-)        brown (Bn)
   7               5       POE2(D3+)        White Blue (Wh/Bu)
   8               4       POE2(D3-)        blue (BU)

Ethernet /IP software layer features:
1) Serving all kinds of industrial automation applications;
2) Standards-based IEEE802.3 and TCP/IP Suite;
3) The application layer adopts the general industrial protocol CIP;
4) IT integration, including Web, OPC and other services;
5) Implementation of standards-based Ethernet controller in physical layer;
6) Specify the transmission PORT, UDP/IP(Port 44818), TCP/IP(Port 44818).

Ethernet /IP physical layer features:
1) The transmission medium can be copper cable twisted pair or optical fiber;
2) can accommodate an almost unlimited number of point-to-point nodes;
3) Linear, star and ring topology can be realized by embedded switch technology and device-level ring network technology;
4) Different physical interfaces can be selected according to requirements: basic Ethernet connection, support COTS off-the shelf commercial standard, suitable for IP 20 applications;Industrial grade applications require enhanced RJ-45 connectors, sealed RJ-45 connectors and more compact M12 connectors for IP 67/IP68 applications.