The 232 cable is the serial cable. RS232 is the serial communication interface, is now one of the mainstream serial communication interface.
RS232 interfaces are widely used in computer serial interface peripherals, connecting cables and mechanical, electrical characteristics, signal functions and transmission processes.
The RS232 interface is divided into male and female heads, usually 9-pin serial interfaces.
There are two methods for RS232 serial port connection, namely direct connection method and cross connection method. Under normal circumstances, the connection of the device and the computer for communication, need to use the RS232 serial port line directly connected; The connection communication between the device and the device will use the cross line of the RS232 serial port line.