modbus serial communication

) { int value = 12345678;//a data waiting to be written Hslcommunication.operateresult write = Busrtuclient.write ("0", value); if (write. issuccess) { //write succeeded TextBox1.Text = "Write succeeded"; } else { MessageBox.Show (write. Tomessageshowstring ()); } }Other data refer to this on the line, if you do not understand, you can contact the QQ

Serial screen (touch screen) configuration Software + 51 single-chip Modbus RTU Multi-machine serial communication program source codeRealization of the touch screen (serial screen) and SCM communication, mainly to solve the probl

Single-chip microcomputer and (serial screen) touch screen communication based on Modbus Protocol (graphic)Introduction: Touch screen can be intuitive, vivid display of operating parameters and operating state, and through the touch screen screen can directly modify the system operating parameters, human-machine interaction is good. Touch screen and single-chip

Tags: arp application nic mobile number control Nid successful LAN AckPrefaceThis article will use a GitHub exposed component technology to implement a special-shaped Modbus TCP client, convenient for the special-shaped Modbus TCP server to read and write, this server can be computer-side C # design, can also be a special device to achieve, It can also be any other server that supports this

Tags: COM add blog electronic share mic int sig jpgModbus protocol display |modbus Communication display |modbus display electronic screen function code sharing, mainly used to achieve "preset multiple register function code." The "0X1F" function code of the MODBUS-RTU protocol is photographed as follows: An exampl

main software:Major software releases:2010Major Software revision:N/AMinor software:LabVIEW Development Systems>>labview Professional Development System Questions:(1) What is Modbus communication protocol? (2) What software should be installed in LabVIEW for Modbus

, the original author posted here to show respect for intellectual property rights, the original article some places have a little mistake, and has stopped updating, also did not provide convenient testing tools, the official Modbus The test tool is a trial version, you need to purchase serial number, so here is my own test tool, the address is as follows, the following examples are based on this tool to ac

Tags: declaring article sed analog serial port processing simulation another Erro preCopyright NOTICE: This article is for Bo Master original article, welcome reprint, and please indicate the source. Contact information: [Email protected] Many instruments/devices provide data acquisition interface, many of which are serial or network MODBUS/TCP protocol. The

other networks, messages that contain the Modbus protocol are converted to frames or packet structures used on this network. This transformation also extends the method of addressing the node address, routing path, and error detection based on the specific network.1, transmission on the Modbus networkThe standard Modbus port is a RS-232 compatible

address byte 3: Register address byte 4: Data length byte 5: Data length byte 6:CRC check byte 7:CRC checksum　　　　　　 　　　　　　 4, the function code commonly used 0x01 reads the status of the output relay 　　　　　　　 　　　　　　 0x02 read the status of the input relay 　　　　　　 0X03 Read multiple registers 　　　　　　 0x05 write the status of a single output relay 　　　　　　 0x0F write the status of multiple output relays 　　　　　　 0X10 Write multiple registers 　　　　　　 5, Example:

+3.65=11.95MS)After modifying the program can finally achieve the desired effect but I use three software debugging can read the data (Serial debugging assistant, Modbussim, Modscan) which only modscan receive data when the flash red but can read the data do not know why the adjustment of his poll time or not the other two software normal can also write data. Thought for a moment that these two days have done all these things. The program is written i

response fast; built-in dynamic management of multi-independent thread connections, while supporting the external application of multi-threaded structure calls; compatible with all development environments under the Windows system, including various versions of vb.net, C #, VC + +, As well as Deiphi, VB, LabVIEW, etc. support almost all of the PLC's CPU comes with communication port, communication expansio

The company is currently doing products are based on Modbus-rtu communication protocol, has been writing touch screen applications, more or less understand the touch screen Modbus-rtu module is how to work;"Upper Machine"Using the Cserialport class to achieve basic serial communica