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...
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I need to capture the startup and shutdown messages of windows, so I need an interface. After I do boot, the program does call my method in the background, but there is no interface, so I cannot receive the shutdown message of windows. But if I open the ...
as mentioned in the title, I will describe the problems encountered in detail and post my upload code first the diamante in the vue component is as follows async upLoadFiles(){ base64 this.$refs.cropper.getCropDa...
doesn t understand how helper functions get multiple states in a document. Can you give a detailed and simple description of the mapState helper function when a component needs to obtain multiple states, declaring these states as computational proper...
1. Using Android webview development, the js and click events in the written html can be triggered, but the ajax request cannot be sent. Why? ...