1. Right-click (WinXP my computer, win7 computer, win10 this computer) and click Manage.
2. Click Device manager and click port.
3. Select the corresponding serial port number and right-click the attribute.
4. Find the advanced port settings.
5. Then you can change the port number.
1. Check the port number through the device manager, whether there is a port number and an exclamation mark
2. Check if any port numbers are the same. If they are the same, please change the port number.
3. The installed driver needs to use the PL2303V200 version of the driver.
4. If you have installed more than V400, please uninstall the program in the control panel and find all the word drivers of PL2303 to uninstall, and reinstall the PL2303V200 version of the driver.
1. From the device manager, check whether the driver is successfully installed and whether there is a port number.
2. You can use copper wire or conductive objects to short the TX and RX pins (2 and 3 feet) of the product to determine whether there is a problem with the product by testing the self-collection function with a friendly assistant.
3. You need to go to the 232 serial port definition diagram of the device. Through comparison, check whether the definition is wrong, and make sure whether you need to add a 232 crossover line in the middle.
1. From the device manager, check whether the driver is successfully installed and whether there is a port number
2. You can take two copper wires to connect to the terminal (TR+ to RX+, TR- to RX-) without connecting to the device, and use a friendly assistant to test whether there is a problem with the self-receiving and self-delivering products
3. Check the debugging software, port number, baud rate and other serial port parameters, and check whether there is a problem with debugging (the baud rate parameter must be consistent with the serial port parameters of the device, if you do not know, you can communicate with the device manufacturer to obtain it)
(out1 display screen)
1. Use a broken network cable to connect to the receiving end, and check whether the screen is transmitted to the remote end
(Short-network images still cannot be transmitted, basically it can be judged that there is a problem with the product, if the customer has multiple sets, the receiver will be exchanged for testing)
2. Look at the network port light, whether it is always on and flashing
(out1 does not display the screen)
1. Determine whether there is a problem with the audio and video cables, and whether the computer recognizes the second screen
2. Determine the mode of the multi-screen display of the computer (it is recommended to expand the screen, in case the remote screen does not support high resolution)
