rs485 pinout

Design As the RS485 only specifies the electrical characteristics of the serial port, as for the transmission of the bitstream interpretation, communication between the two sides how to answer, it is not hard to set. Therefore, the application of the equipment is a variety of applications, the communication protocols used are also various, such as for the device controller, but also for the LED display, but in the final analysis, the agreement to com

In industrial control, IoT, intelligence and other projects Modbus-rtu equipment is one of the most common types, it uses rs485/232 bus communication mode, MODBUS-RTU protocol has a long history of mature and reliable. What we're talking about today is using the PHP language to apply the OHSCE framework for general control of MODBUS-RTU devices.First, preparePHP 5.4 and aboveOhsce V0.1.26 (FIX20170120) and aboveA computer (acting as an upper machine)M

process. 1. Hardware Platform The hardware platform for this improvement test is the lpc22eb06i experimental platform developed by intime Based on the lpc2294 arm controller. Its main functional modules include: ① 2 MB flash, 1 mb sram (expandable to 4 MB), 256b E2PROM with I2C interface and other memory;② Two RS232 (one of which can be connected to modem), RS485, can and other communication bus interfaces;③ Two debugging interfaces: LPT and JTAG;④ M

require a Port Pin to implement some timer functions. Some processors also have drain output and high current output capabilities, you can easily directly drive relays or solenoid coils without the support of additional drive hardware. When counting the processor I/O pins, we must take into account some pins that are used in a time-limited manner using the processor's internal functions (such as serial interfaces and timers. 1. 2. Number of interfaces to be usedThe main function of the embedded

can pick up valid signals from ground interference, and the difference receiver can distinguish the potential difference of more than 200mV. If interference and noise are mixed in the transmission process, the interference and noise can be offset by the difference amplifier. Therefore, the effects of ground interference and electromagnetic interference can be greatly reduced or avoided.RS-422A transfer rate (90 Kbps), transmission distance up to 1200 meters. RS-485 is a point to multi-point com

C51 is almost the same. Next, let's look at the old tree'sArticleBeijing's college students have nothing to do with the development and look for the resistance, capacitance, transistor, chip, and connectors in the old tree's article, find out how the motherboard, Nic, sound card, and video card are drawn on your computer and find the feeling that these boards are a masterpiece of experts. Create a small product, follow the ideas in the old tree Article **, find a protel99se book, start from

main chipsThe processor uses stc11f04e, which has the following features: (1) powerful encryption, high speed, high reliability, and low power consumption (2) Strong Antistatic and strong anti-interference Cd4069 driver for ultrasonic emission Cx20106 integrated circuit is used for ultrasonic reception, which is highly integrated and not prone to faults. The network communication uses the maxcompute chip, which has short-circuit current limit and can be output to high-impedance status through t

video interfaces, RS485 serial interface control, protocol interface control, and system software management, it mainly provides video compression or decompression function to complete image data acquisition or restoration, etc. currently popular Based on MPEG-4 or H. 264 of image data is compressed, and data and audio data are processed over the Internet. Development of DVS After recent years of development, video transmission has gradually evolved

have time to get angry, I don't have time to be unhappy, and my technology is still poor. But I believe that after a while, I can be an exquisite electronic engineer with excellent technology and exquisite life.Thank you for reading this article. Appendix 1: My long-term embedded technology learning plan:1. MCU classification: four-digit machine, 51, PIC, *** R, and MSP430 Series for learning;2. hardware knowledge: components, PCB wiring, classic circuits, communication protocols, EMC, developm

and Baosteel Steel Pipe CompanySl4: 7.x driver, which connects SIEMENS S5, S7, AND Ti series PLC over Ethernet from Layer 4-ISO Transport Layer of Siemens network.S5: supports 115u, 135u, and 155u, and cp143 or cp1430 communication modules.S7: supports 300 and 400 series PLC, but does not support CP443-TCP modules.Ti: supports 545, 555, 560, and 565 series, and cp1434tf communication modules.Standard Ethernet Card: 3ComS7 200 PPI: third-party OPC Server Driver, supplier softwarw.lbox, support S

, which requires not only the external hardware to have real-time processing capabilities for interfaces, in addition, the processor must efficiently process interface data at a sufficient speed. For example, at91rm9200 is an industrial arm9microprocessor produced by ATMEL. It is based on the ARM920T core and can process up to 200 MIPS, at the same time, the processor is configured with USB, Ethernet, infrared serial port supporting RS485, IIC, SPI, S

scene in real time with the ARM hardware platform as the core, and transmits video images to the host through wireless networks, in order to achieve analysis, storage, display, and other functions, compared with the traditional analog monitoring system: its networking costs are greatly reduced, the system volume and weight are greatly reduced, and operation and maintenance are easier. 1 monitoring system solution introduction The network structure design of the remote monitoring system direct