RS232 serial port is used for MCU and RS485% E6% 8e% a5% E5% 8f% a3 &；; Ch = ww.xqy.chain "target =" _ blank "class =" link-baike "> RS485 interface, their composition definitions and logic levels are different, so other devices are needed to complete their communication.
1.PC/PPI cable.
Connect the single chip microcomputer and s7-200 through PC/PPI cable, and the data communication is correct;
2.RS232-RS485 adapter.
The RS232 interface described in the adapter is in DCE mode, which can be directly connected with the serial port of DTE terminal equipment, and needs to be connected with DCE equipment with a reticle.
Simple distinction between intersecting line and straight line of serial equipment connecting line;
If there are male and female terminals at both ends of the cable, direct connection is adopted;
If both ends of the cable are male or female, cross wires are used.
FX2N-485-BD lightning protection photoelectric isolation RS485 interface board of Mitsubishi FX2N series PLC is used for FX2N-485-BD interface board of Mitsubishi Corporation. This product adds lightning protection circuit and photoelectric isolation circuit on the basis of the original non-isolated interface board, and other functions and usage methods are exactly the same as the original non-isolated product. FX2N-485-BD is especially suitable for the following occasions:
Serious interference occasions, such as communication with frequency converter.
When the * * * mode voltage of each RS485 node is high, it is easy to damage the communication port.
Communication lines are vulnerable to lightning, such as overhead lines and communication lines without metal pipes.
Where long-distance signal transmission is needed.
Safety regulations require that communication must be isolated, such as communication between coal mines and underground, flammable and explosive occasions in chemical industry, etc.
Main technical parameters:
Isolation voltage: 1000VDC (maximum 3000VDC, please specify when ordering).
Built-in lightning surge protector with repeatable surge capacity: IPP =100a (10/700us, 4KV).
Compliance with standards: ITU-TK20/2 1, VDE 0433. 15kV ESD protection
Baud rate: 0 ~ 1 15.2kbps adaptive.
Maximum communication distance: 2000m (9.6Kbps),1200m (1 15.2Kbps).
Communication line: shielded twisted pair with cross-sectional area greater than 0.3mm 2.
With data transceiver indicator light
Working temperature:-40 ~+85℃