RS232 serial lines are used in serial communication between equipment, and the applicable surface is wide. The RS232 serial connection method should be determined according to the actual connection device. Let’s first look at the definition of its pin. At present, the RS232 serial port interface is DB9 pin, and its interface pins are defined as follows:
pin definition symbol
Green Union RS232 serial line core color definition:
1 black
2 brown
3 red
4 orange
5 yellow
6 green
7 blue
8 purple
9 white
When the user needs the DIY Green Union RS232 serial line, it can correspond to the wiring according to this line color.
RS232 serial line wiring method schematic diagram
According to different needs,RS232 serial line
Theconnection method is divided into two types: direct connection and cross.
So what occasions are used for the direct connection between the RS232 serial line and the intercourse?
In general, the connection communication between the device and the computer needs to be directly connected to the RS232 serial line; and the connection communication of the device and the device will use the cross line of the RS232 serial line. When choosing, the user should choose the RS232 serial lines of different connections according to the actual situation between the two devices.