rs485 pinout

so on.In these three devices, We Need To concatenate a single table and three tables, connect two electric meters to the concentrator, and finally passProgramWrite the table numbers of the two electric meters into the concentrator. All the data we obtain is obtained through the concentrator. The concentrator provides GPRS, RS485, and remote carrier methods to connect the concentrator and obtain its data. In fact, the main work is this concentrator, w

the device driver. (4) Diversity of communication links. communication methods such as RS232, RS485, RS422, RJ45, and 3G/4G may be supported for the same device, therefore, a device must correspond to multiple communication methods (Serial Port and Network), which also causes great obstacles to our development. (5) the link between the device driver, I/O channel, and the actual on-site hardware terminal is complex and may be: one device driver corres

modules, the WCDMA downlink speed can reach 21 M/s (optional) Angular Extension There are up to 320 picking feet to meet your various scaling needs Camera Interface Support for 2 million cameras/5 million cameras HDMI Interface Standard HDMI v1.4, 1080p HD resolution LCD interface LCD connected to RGB Signal WIFI 802.11b/g, 802.11n (1x1) BT 2.1 + EDR/Bluetooth 3.0 TF card interface One TF card interface

more complicated ). The Android kernel is the Linux kernel. To avoid the Hardware abstraction layer (HAL -- Hardware Abstarct Level) that Google adds to Android, it is to encapsulate specific Hardware logical operations. Because the Linux kernel must follow the GPL Protocol requirements to be open-source. If Android is completely open-source, hardware shanzhai cannot be imagined, which has a devastating impact on hardware vendors.The Android framework must have seen the following figure before.

For more information, please click here:http://www.topeetobard.comShop:https://arm-board.taobao.comCore board:provide 1G and 2G memory version, full machine welding, eliminate manual, batch worry-free. Core Board supports battery management, charging and discharging circuitry and fuel gauge for handheld applicationsDevelopment Board Interface Introduction: million cameraUSB cameraVGA moduleRFID Module Serial Adapter Board can/rs485 ModuleRelay ModuleD

Serial Communication Overview There are many kinds of serial communication protocols, such as rs232,rs485,rs422, even the popular USB is serial communication protocol. And the application of serial communication technology is everywhere. Perhaps everybody sees most is the computer serial port and the modem communication. Remember when the PC was first popular in China (about five years before the 90 's), when someone even used a serial line to share

Operating frequency: 433MHZ (ISM free band, no need to apply for a fee) Transmitting power: 50MW~1000MW Reception sensitivity: 17dbm (WPLC-C1), 27dbm (WPLC-C2), 30dbm (WPLC-C3) Tx Current: Receiving Current: Sleep Current: Serial Port rate: 1200/2400/4800/9600/19200/38400bit/s Switching volume Channel: 1~4 switch input/output channel, OC Gate or 0~5v TTL voltage Signal Transmit/Receive conversion time: Interface Data format: 8e1/8n1/ Working power: 9~24v (±0.5v) (rs232/

common serial port protocol through a dedicated chip PB331, directly compatible with the original RS485 scheme, such as modbus-rtu,dlt654 Meter protocol, cj/t 188 household metering instrument data transmission. No development risk is required. Powerbus from many years of mature application of fire bus technology, after years of experience in engineering verification. Power line Carrier TechnologyPowerline Communication (Power line Communication

Tags: style blog http color ar sp Data div 2014Recently in the Modbus TCP, encountered a TCP sticky packet problem, because the client sent packets of fewer bytes and speed (10ms/times), resulting in the server side received a few packets!There are several types of general adhesive packages:When dealing with TCP sticky packets, many people define a frame's data structure, containing information such as identity, length, and data.I think Modbus TCP frame structure is very good, can be widely used

); } } Catch(IOException e) {e.printstacktrace (); } } } Static voidListports () {System.out.println ("All ports!!! "); @SuppressWarnings ("Unchecked") Java.util.Enumerationcommportidentifier.getportidentifiers (); while(Portenum.hasmoreelements ()) {Commportidentifier Portidentifier=portenum.nextelement (); System.out.println (Portidentifier.getname ()+ " - " +Getporttypename (Portidentifier.getporttype ())); } }

ASIC chip compression, the task of packaging sent by the THTTPD completed. In the case where multiple monitor-side requests exist, the instruction response itself is thttpd, so we only need to implement data transfer. In the main function, execute get_device,driver_init,device_init and Alloc_resource,interrupt_enable,device_start in sequence before starting the main loop. The coding compression of the video stream begins. Add Timer response function, (void) tmr_create ((struct timeval*) 0, Tr

Reference: http://blog.chinaunix.net/uid-26119273-id-3356414.htmlLearn Linux, ready to do products, do not regard Linux as the ultimate goal (of course, this is for the application), to have just the idea of Linux as a platform . More important also in a variety of products required by the professional technology , such as communications, such as can, RS485, GPRS and so on, or industrial control, IO control, real-time characteristics and so on. Linxu

Understanding Serial Communications There are many kinds of serial communication protocols, such as rs232,rs485,rs422, or even the current popular USB is serial Communication protocols. And the application of serial communication technology is everywhere. Maybe everyone sees the computer serial and mode. M's communication. Remember when the PC first began to catch on in China (about five years before the 90 's), when there were even A man uses a seria

node units send information at the same time, depending on the node identifier (often referred to as ID, also packaged in a fixed data format) to determine their priority relationship, so the ID is not to represent the destination address of the data sent, but represents the priority of each node access bus. So the CAN bus does not have the concept of "address" similar to other bus, when adding node units on the bus, the hardware and software of the other node units connected to the bus need no

Cai Mao CM550 Series Intelligent Wireless Remote Control Terminal (hereinafter referred to as wireless RTU), in order to meet the market demand and self-developed collection of data acquisition, long-range and wireless communication functions as one of the wireless terminal control products. RTU integrates analog signal acquisition, switching volume input, switching output, pulse count, support Ethernet communication, serial communication, RS485 commu

With the continuous enrichment of communication services, more and more users need to rent the network resources of telecom operators to carry out various business communication or set up a special network. China's accession to the WTO will further and deepen the introduction of competition mechanism, will not only lead to domestic emerging telecom operators and traditional operators of telecommunications competition, At the same time, it will cause competition with the corresponding business pr

converted two machines how to communicate, generally depends on the lower machine. TCP/IP is generally supported. But the lower machine generally has a more reliable unique communication protocol, buy the next time, will bring a lot of manual CD, tell you how to use the unique protocol communication, which will give a lot of examples, generally for programmers to look at the same thing, using some new API. 　　Multi-language Support function module, generally supporting several high-level languag

1.ModbusModbus technology has become an industry standard. It was developed and developed by the Modicon company. Its communication mainly usesrs232,rs485 and other communication media. It provides users with an open, flexible and standard communication technology that reducesDevelopment and maintenance costs.Modbus communication protocol by the main device to establish a message format, the format includes the device address, function code, data addr

next data block, the data check using vertical accumulation and calibration, you can also use 16-bit CRC check. belongs to the simple Arq (automatic request retransmission) protocol, so it is also suitable for use in a 2-wire half-duplex RS485 network. 2.1 TerminologyBefore specifically describing the specifics of the Xmodem agreement, we first give the term "Diagram 2", which is used in the protocol.Term numeric meaning remarksDecimal hexadecimalSOH

Tags: equipment digital industry pressure STR Preface Dbus mod Communication ProtocolObjectiveModbus is one of the most widely used communication protocols in the automation industry, like RS485 and RS232.ApplicationIndustrial field control equipment, there are relays, proximity switches, solenoid valves, pressure gauges and so on. By signal type can be summarized as: DI (digital input), do (digital output), AI (analog input), AO (analog output).Modbu