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Serial port communication of RH series card points out that did not find the card or card type is unknown?

Answer:

Serial port line must be straight connect other, and check whether the serial lines' connection is good

Serial port line is too long that communication becomes unreliable, use short serial port line to change bit rate to 9600, and then come back to the long line. (Baud rate 9600 can communicate 50 meters, and the standard distance of baud rate 115200  is 15 meters)

ƒUSB to serial cable port is usually more than COM1, and check whether the USB driver is installed successfully

Replace the serial port line, the computer or the control card at a convenient time, please judge quickly.

 

 
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