1. The interface and connection method of the RS232 serial cable: The RS232 serial cable is an interface for serial communication between devices and is widely used. When connecting the RS232 serial cable, you should choose the appropriate signal cable according to the specific situation. The standard RS232 serial cable uses a DB9 connector, and its pin arrangement order is: facing the connector, the large edge is facing up, and the order from left to right is 1, 2, 3, 4, 5, and the corresponding female connector is arranged from right to left 1, 2, 3, 4, 5.
2. Straight-through connection and crossover connection methods of RS232 serial cable: In the straight-through connection method, pin 2 of one device is connected to pin 2 of the other device, and pin 3 is connected to pin 3. In the cross connection method, pin 2 is connected to pin 3, and pin 3 is connected to pin 2.
3. Connect the DB9 to RJ45 adapter: First, connect the DB9 interface and the RJ45 interface in the order indicated by the adapter. The DB9 interface refers to the 9-pin connector of the RS232 serial communication interface.
4. Identify the COM port: When the five pins are on the top and the four pins are on the bottom, the leftmost pin is numbered 1 and the rightmost pin is numbered 9.
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