A HMI connects four PLC with the same parameters (19200, N, 8, 2) through COM2 port RTU485. Because it is one-to-many, I use for loop to traverse four PLC to read variables. You only need to set the station number. by monitoring a second variable insi...
client initiates tcp connection con1:Aip: Aport- > Bip:Bport, does not have a problem, do not close the connection, initiate tcp connection con2:Aip:Aport- > Cip:Bport, will address already in use, according to the quad, the two connections are not the ...
problem description the iis7.5 80 port that the server is running is unmodifiable apache2.4 8080 port runs other services now it has done iis redirection to www.b.com--> www.b.com:8080 now access always has 8080 port number apache how to hide the ...
The default port of the page that pops up after 1, npm install-g create-react-app 2, create-react-app my-app 3, cd my-app 4, npm start is 3000. How to modify the default port? The server is not under the premise of this port number. Added: to packa...
give an example, the local client accesses the remote mysql server 3306 port. requires access to remote port 3306. my question is: does the network of the local client need to apply? Local access to remote port 3306, which port is used by the local...
< button onclick = {this.btn (data)} > Btn < button > Why do you run this function btn = (data) = > {console.log (data)} then btn = (data) = > () = > {console.log (data)} however, when parameters are not passed < button onclick = {...
I use the following to loop out data for nearly 23 seconds. Is there a better way to optimize < del > Thank you < del > export async function getOrgTree(treeArray){ let r = []; let tmpMap ={}; for(let i = 0, len = treeArray.length; i < len...
printCnt() { 1.html 2.-sharpprint window.document.body.innerHTML = document.getElementById( orbitIframe ).contentWindow.document.getElementsByTagName( body ).innerHTML; window.print(); : location.reload(); } w...
recently, when writing React, to define a class method, I saw the following two writing methods: fun1 and fun2, both of which are not problematic to use. After reading the introduction guide of Master Ruan, I found that they are all written in fun1, so ...
1. I am a rookie, in the process of learning springboot to do annotation mode of the full table fuzzy query, the result set of the query is always empty, but the sql statement in the navicat test can normally find the data, please answer the doubt, than...