rs232 rj11

I have no intention to describe the usage of each class and interface of comm API in detail here, but I will introduce the class structure of comm API and several important API usage.All comm APIs are located under the javax. Comm package. From the javadoc of comm API, it only introduces the following 13 classes or interfaces: Javax. comm. commdriver javax. comm. comport javax. comm. parallelport javax. comm. serialPort javax. comm. commp ortidentifier javax. comm. commp ortownershiplistener j

Install and configure Rose ha 1.1.1 install Rose ha Copy three installation files of roseha to/data/install to facilitate installation of the two hosts. Before installing Rose HA, modify the hosts file and enter the corresponding host name and IP address. The modification method is the same as that of the Windows Hosts file, we can enter the host name. Modification method: [[Email protected] # vi/etc/hosts Add. Shape: Ota-db1 Ota-db2 Hardware Installation Connect the COM ports of Server 1

operating system with rich application resources. With these resources and powerful system functions, users can quickly develop embedded systems for complex applications based on embedded Linux. Therefore, combined with the advantages of the system, the system can meet the requirements of embedded systems and remove redundancy. This article provides a Linux-based development method for the system and a specific embedded application development example.1. hardware development environment1.1 Deve

chart conforming to the national military standards of the Department of air security of the haisi, and pre-processes the electronic chart data in advance, delete redundant data, compress two-dimensional geometric data, and create a grid index. On this basis, the software design of the marine navigation system is carried out, which greatly speeds up the system response.1. system hardware structure and software development platformThe overall system structure 1 is shown in. The system uses the M

This article feels good. It is helpful to understand the network data transmission using the GPRS module. I don't know if the 3G module is similar in principle, but it is just a matter of speed, this is because when I develop network programs on my andiroid mobile phone (started from 3G), I use socket-related APIs to communicate with the internet server, which is different from the conclusion, to be confirmed! Conclusion: 1.CPUCommunication with GPRS requires

Development Board, is used as the communication interface of the serial port terminal, which has been obtained from the RS232 interface, but uart1 and uart2 are not obtained from the RS232 port, instead, the corresponding COM1 and con3 pins are obtained respectively. During the test, the RS232 conversion circuit is required. Therefore, you need to modify the abo

devices, you can also manage the links of the same device.The management of several links of the same device means that, for example, a channel used for SDP communication and a channel used for RFCOMM communication are opened at the same time, these channels are managed to distinguish them from each other without mutual interference.SDP (Service Discovery Protocol) Using Bluetooth technology, you can enjoy a variety of services, such as headset, hands-free phone, dial-up, input devices, image t

be expressed in table 2. Table 2 Requirements of the device debugging system The following uses the 4 + 1 view method recommended by RUP to design architectures from different views to meet different requirements in different categories.Logic view: design an architecture that meets functional requirements First, we will conduct a preliminary design based on the functional requirements and divide responsibilities at a large granularity. 5. * The application layer displays the device status and p

requirements. Logical View: Architecture designed to meet functional requirements First, according to the functional requirements of the preliminary design, a large granularity of responsibility division. As shown in Figure 5. The application layer is responsible for the display of the device status and provides a simulation console for the user to send debug commands. The application layer interacts with the communication layer and the embedded layer, but the application layer does not know th

, can solve even a minor problem for your project, it is enough.Although my introduction to this series of things is not a web framework, nor any open source server, but I believe that as a programmer, what kind of problems will be encountered. Sometimes the more simple the problem is, the less it is, the harder it is to find the guy. As long as you are not dealing with "architecture", "widget" or "frame" all day, believe what I say you will use.1 Introduction to Serial communicationMany applica

interface adapters or download lines to work together, which may increase user investment and costs. To implement ISP programming, the P89LPC932 chip relies on a segment preset at the factory, this code is stored at the high-end 512b address of Sector 7 in the P89LPC932 code space (the 8 KB program memory in P89LPC932 is organized into 8 sectors, each of which has 1 kb ). This Code provides an interface between the device's underlying operation code (such as erasure and programming) and serial

then sent to the GPRS terminal by the BSS. 2 Embedded GPRS Communication System implementation 2.1 Hardware Design of GPRS module The Embedded GPRS wireless communication module consists of a single-chip microcomputer (msc1210y5) embedded with TCP/IP, a GPRS module, a SIM card holder, an external interface, and extended data storage. Figure 2 shows the hardware diagram of the system. The MSC1210 control the information received and sent by the GPRS module, and communicate with the external cont

easily tested because it is a software system supporting hardware products, otherwise, it will be difficult to distinguish between hardware faults and software faults. In addition, it must have high performance. The specific performance indicator is "display of device status refresh five times per second, it also supports sending a complete command word ". 1-3. 　　　　　　　　　　　　　　　　Figure 1-3 CRC card: main objectives of the device Commissioning System Then, the software architect must plan the spec

The connection string is also divided into two parts: pass-through and cross. The connection is generally used to prolong the connection between the PC and the device. 2, 3, and 5 are connected to 2, 3, and 5 respectively, because the PC is generally a public head, most of the devices are headers, so they are common and can be used for extension or connection. Crossover is generally used for connection between PCs, set 2 to 3, 3 to 2, 5 to 5. Generally, both ends are mother-headed! Before the co

The serial cable can be divided into straight chain and intersection. Generally for straight line extension PC equip, will 2, 3, 5 connect 2, 3, 5, because PC universal male. But the devices are mostly female, so they are just plain, and it can also be used to extend the connection; the crossover PC is connected to the PC with 2 pairs of 3, 3 pairs of 2, 5 to 5, and the general two are female at both ends!Before the computer appeared, the EIA established the

1.rs232 levelOr the serial level, some even say the computer level, all these statements, refers to the computer 9-pin serial port (RS232) level, using negative logic,-15v ~ -3V Rep 1+3V ~ +15v Rep 02.rs485 and RS422 levelSince both use differential transmission (balanced transmission), so they are level mode, generally have two pin, a, bVoltage difference between the sending side AB+2 ~ +6v:1-2 ~ -6v:0Volt

The serial line also points through and crosses, pass-through is generally used to extend the PC and equipment, will be 2, 3, 5 respectively connected 2, 3, 5, because the PC is generally male, and the device is mostly female, so just they are universal, can be used for extension can also be used for connection; crossover is generally used for PC docking with PC, 2 to 3, 3 to 2, 5 to 5, usually both ends are female!Before the computer appeared, the EIA established the

Android Development (37) android uses android_serialport_api to operate the serial port to solve the permission problem. androidserialport Recently, we have a project where we want to use the android device to operate the serial port zebra GK888T printer and print the QR code using the printer. Hardware Device connection method: Android devices connect to the serial port of the zebra printer through serial port RS232 Solve the problem of using Andro

, such as Ethernet, T. R., FDDI, ATM, SOCC, and SLIP. A non-TCP/IP network is used to provide a communication path that replaces TCP/IP for HACMP to monitor nodes in the HA environment (Cluster, it can be used to connect nodes with RS232 serial lines, or set the scsicard or SSA card of each node to the Target Mode. 1. Two servers (host A and host B) Running the Hacmp software simultaneously; 2. The server serves as the backup host of the other Party i

the RS232 interface, but uart1 and uart2 are not obtained from the RS232 port, instead, the corresponding COM1 and con3 pins are obtained respectively. During the test, the RS232 conversion circuit is required. Therefore, you need to modify the above Code to enable the corresponding device. Modify as follows: Int devicespeed = b115200;Int ttyspeed = b115200;Int