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...
how to optimize readability and simplification, here are two pieces of code: the first paragraph of code const defaultObj = { content: { }, }; defaultObj.content.address = res.after.temporary.address.data; defaultObj.content.people = res.afte...
now I want to get a content-type=application json callback data. Oddly enough, I can t get the data using @ RequestBody, as shown in the following code: @Data public class BaiduDocNofityResponse { private String messageId; private String messa...
at first I thought css was simple, but I just wrote some styles now it is found that these attributes influence each other and produce different effects, such as the effect of an attribute, in this case, in that case, it feels a little messy now yo...
the RabbitTemplate class is used in spring-boot projects. Some businesses need manual ack, and some can automatically ack. What do you need to do? my idea: I don t know if it works? can you create multiple RabbitTemplate @ Bean to deal with differen...
cookie.setDomain("www.gateway.com"); cookie.setMaxAge(60*60*24*30); response.addCookie(cookie); I added a cookie to response. and the Set-Cookie, also exists in the response returned by the page request, but the browser does...