RS232 Serial Cable Standard Connection and RS232 Pin Definition

RS232 Serial Cable Standard Connection and RS232 Pin Definition

RS232 serial cable is widely used in serial communication between devices. Serial port has high compatibility, widely used for desktop connections of various kinds of serial devices, such as Computers and tax control machines, digital machine tools, PDA, Modem, set-top boxes, barcode machine, industrial instrumentation, and other serial port equipment communication function.
RS232 serial port cable connection depends on the actual device connection. Let’s look at the pin definition. At present, the interface of the RS232 serial port line is the DB9 pin, and its interface pin is defined as follows:

As shown in the figure above, RS232 serial interface pins are divided into two rows above and below.
In the case of face to face and a large edge of the interface facing upward, there are 5 stitches in a row, from left to right, corresponding to 1-5 stitches respectively. Four stitches in a row, from left to right, correspond to six to nine stitches.