If it is a communication line, the transmission at one end is connected to the reception at the other end. If it is an extension cord, the line number of the same name is connected If a ground wire is required, connect the ground wire directly, the purpose is to allow both parties to have a reference level In the production of serial cable, there are three very important principles: In the serial cable, the extension cable only increases the length of the line, so the line sequence is only the extension of the original line sequence, and the communication line must ensure the correct connection of the communication signal, so the way of making the line is not the same. In the serial communication standard, the pin definitions of RS-232C, RS-422, and RS-485 are different, so the way of wiring is also different. To know the production of the serial port line, you must first know the definition of the serial port pins, and then determine the order of the lines according to the role of the serial port connection line. Because the interface type is different, the interface pin is different the function of the connection line is different, the line sequence is different. The most typical restriction is the interface type and the function of the connection line. ![]() The serial connection line is subject to many restrictions. 1.Production and conversion of serial cable
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