rs232 to rj11

a clear definition of the size of the connector and the placement of each pin. (Yangtou)MAX232: Converts the TTL level from 0V and 5V to between 3v~15v or -3v~-15v.Discrete components achieve RS-232 level and TTL level conversion circuitry.TXD for low Q3 conduction pcrxd (if PC interrupts accepted), TXD send high level, Q3 cut-off, pcrxd internal high resistance, PCTXD usually -3~-15v, pull down pcrxd.The PC sends the signal: When the PCTXD is low, the Q4 cutoff, the RXD is high, and when the P

for the communication of the Arduino board."The Widgeduino provides two basic operating modes: widgeduino through the serial port: in the widgeduino application and the Arduino board between the serial communication. Based on a point-to-point (using RS232) or wireless point-to-multipoint (via Xbee 802.15.4). widgeduino Through the network: IP-based networking makes the internet of things possible. Such a pattern can also be used as a hy

Encapsulate the communication as a class "The features of the program have advantages:Traditional wording when the bar code scanning head stop, abnormal power, network anomalies, communication terminal, the program can not resume the connection, the loss of data caused by failure, I write the program, whether the scan head power off or the production line restart, can be the first time to restart the connection and communication, stability is very good.This is also in a friend old program consta

equipment through the Internet.2, communication "refers to data communication only, that is, through the computer network system and communication system to achieve the end-to-end transmission." The communication "letter" refers to the information (information), the information carrier is the binary data, the data can be used to express the traditional media form of information, such as sound, image, animation and so on. "Communication" weighs on the means of transmission or use, from this poin

. Baud rate Index according to the signal to the carrier modulation rate, it is in the unit time the carrier modulation state changes the number of times to express, its unit is Porter (Baud). The baud rate is related to the bit rate: bit rate = baud rate x the number of bits corresponding to the individual modulation state. Obviously, the bit rate of the two-phase modulation (a single modulation state corresponds to 1 bits) is equal to the baud rate, the bit rate of the four-phase modulation (

(after DAC input into the PLC) input general connected photoelectric coupling circuit and microcomputer input interface circuit (input data register, circuit, interrupt request circuit) on-site commonly used output: solenoid valve, CONTACTOR, relay, signal lamp, motor, etc. Its circuit composition and input are similar: output interface circuit and Power drive circuit (relay mode output, Thyristor mode output, transistor mode output)) 4, Power 5, Backplane and rack 6, PLC external equipment (pr

the outset, we plan to develop it in the open." There will be no difference between the developer and the external contributor who is committed to Qt within Nokia. ”According to plans, Nokia will release a beta release by the end of 2011; The final release will be in 2012 years. From five aspects:1, the introduction of open management model, QT5 project more open. One of the appearances is the Android version management system.2,QML's class citizenship, and the engine behind it has been iterati

Temperature Recorder Overview Temperature Recorder , 32-way universal input (configurable input: standard current, standard voltage, thermocouple, thermal resistance, frequency, millivolt, etc) 16-way alarm output, one RS232 communication interface or RS485 communication interface, can provide sensor distribution and 16-way relays contact output, with powerful display function, real-time trend curve display, history curve recall, high [1] precision b

) I need to create a line with both ends with a public header to connect to GPRS and the Development Board. The connection method is: 1---3. That is, two or three calls, and other direct connections. The relationship between colors and pins (do not know whether this relationship is universal ): 1 black, 2 Brown, 3 red, 4 orange, 5 yellow, 6 Green, 7 blue, 8 purple, 9 white. Serial Communication Flow ControlIn the process of serial communication, we often see the two options, namely, RTS/

When a third-party device, such as RS232/485 converter, is used in the network, the problem may be caused by the converter, or the converter wiring is incorrect. Check carefully according to the cable connection diagram, or change the converter for testing. Some converters require external power supply and are easy to ignore. 3. Programming Problems Check whether the hardware connection is correct.ProgramWhether the problem exists, including setting

and half-character and byte read/write Signals• The 230-foot tqfp package comes with an independent test frame test point, and the core board user can provide the test frame according to the data volume.Bottom Board requirements:Onboard standard JTAG interface• Two independent on-board Camera Interfaces• Onboard RS232 serial port x 3,• Onboard VGA, supporting 1024*768 resistive or capacitive touch screen or common display• Onboard 3 USB Host 2.0 and

low. USB can be connected to up to 127 devices in series. Hot swapping is supported. The latest USB 3.0 specification is available. RJ-45 InterfaceIs the most common interface for Ethernet. RJ45 is a common name, which refers to the eight locations (8-pin) defined by IEC (60) 603-7 using the International connector standard) modular Jack or plug. Serial Port Properties 1. portname: Default Value of Serial Port name: COM1 The serial port is a file for the operating system. If you set p

How to interconnect single-chip serial communication rxd with txd Category:8051 2012-04-0711: 35 Read by 348 Comment (0) Favorites Report Reprinted from: http://blog.csdn.net/sdwuyulunbi/article/details/6632382 I believe many people are confused about how to connect rxd and txd when the microcontroller communicates with a computer or chip. In some circuit diagrams, some are the direct connection method and some are the cross connection method, which makes people

This article from: http://www.cnblogs.com/tony-yang/archive/2009/06/03/learnserialport.html C # has a lot of SerialPort learning materials on the Internet. Here I mainly sort out the materials used in my learning and classify them. First, we didn't have serial port hardware when learning, so we went to find a tool to simulate virtual serial ports. I'm using vspm.exe, http://www.skycn.com/soft/30517.html Start to learn about SerialPort. First, let's take a look at some basic knowled

baud rate bit/s. The default value is 9600. Bit Rate = baud rate X binary digits corresponding to a single modulation state. RS232 is to use a maximum distance of 30 m on close-range transmission. RS485 is used for long distance transmission with a maximum distance of 1200 m 3. databits: Get or set the length of standard data bits for each byte. The default value is 8. When a computer sends an information package, the actual data is not 8 bi

access technique, for example accesses the relational database, APIs and DLLs and controls are not very convenient, while high-end scripts are the VBA family, efficient access tools, sophisticated control resources, and powerful API calls.5. Communication DriverCommunication driver correspondingly slow development, this is also because it is too mature, first of all, its framework is the use of encapsulated communication framework and development of data flow combination, that is, developers do

copied to the Keil/uv2 directory. (If it is Kile3, then Uv3,kile4 is UV4)② Open the tools.ini file under the Keil folder and type C51 under [UV2] (above [CDB0=UV2\STC]). CDB ("STC"), then save the exit and add it. (If it is Kile3, then Uv3,kile4 is UV4)To use: When setting options for the target, click on the Device page and select STC in database. When you create a new project, select "STC" in the Select a CPU Date Base file.Note: The STC database provided by Acer's official website is REG51.H

I. Basic knowledge1. Serial communication and parallel communication: More and more serial communication is used at present. The advantage of serial communication is that the connection is simple, the transmission distance is far, the disadvantage is slow transmission speed. 2. Serial communication: Divided into synchronous communication and asynchronous communication; asynchronous communication means that the sending and receiving devices use their own clock control to transmit and receive data

consumption. The embedded system market is no exception. Similar to the 90 's PC market, today's fast-growing MIPI interface smartphone and tablet market offers embedded designers an excellent opportunity to integrate a variety of lower-cost and proven components into the board as long as they address compatibility issues. With a new generation of programmable bridging solutions based on the Uld FPGA, embedded designers are now able to overcome these hurdles by leveraging the benefits of MIPI d

Teach you to buy Huafeng handheld IC card reading and writing machine: F8 handheld IC card reader with 32-bit ARM 9 core microprocessor, with high performance, low cost, strong scalability and so on, with the wince operating system, with multi-tasking capabilities, providing advanced maintenance and management functions, It greatly improves the maintenance and development efficiency of the application and ensures the stability of the application. Support reading and writing RFID contactless IC c