Is serial cable directly connected or crossed?
May 18, 2023
Is serial cable directly connected or crossed?
1. Serial port interface and connection method Male and female headers are divided into three types: male-to-female, male-to-male, and female-to-female. The above three types of connection lines have crossover lines and straight lines, so there are a total of 6 connection modes.
2. What is the direct connection and the crossover connection serial cable: 2 pairs 2, 3 pairs 3, 5 pairs 5. Crossover serial cable: 2 to 3, 3 to 2, 5 to 5.
3. Why are there crossover and direct serial lines? The standard DB9 definition is that pin 2 is RXD and pin 3 is TXD. When designing the circuit, some people connect pin 2 to TXD and pin 3 to RXD in order to use a direct connection. If you don’t reversely connect the transceiver and the standard pin definitions when designing the circuit, you have to use a crossover cable.
Under normal circumstances: the two female ends are cross wires, and one male and one female are straight lines. Communication conditions: RXD is connected to TXD, TXD is connected to RXD, and the choice is crossover or direct connection according to the circuit design. Make a serial cable: when there is only a straight cable at hand, you can cut it off. Welding 2 to 3, 3 to 2, and 5 to 5 is a crossover cable.
