What is RS232 cable?
RS232 cable is a kind of cable used for RS232 serial data transmission, but technically the cable used for RS232 data transmission should be DB9 cable . RS232 is more of a customary name, so RS232 cable and DB9 cable are the same kinds of cable. If you don't know what RS232 is, you probably still can't understand it, so I think you may need to understand what RS232 is first. What exactly is RS232? First of all, it is a form of serial data transmission. Or simply put, it is a form of communication. Most people simply refer to it as a serial connection. At one time, it was the most common form of data transfer. You may recognize the standard 9-pin DB9 cable. In short, an RS232 connection uses a positive voltage of binary 0 and a negative voltage of binary 1 to transmit signals. But what is the use of RS232 for PLCs? PLCs use RS232 to communicate with other modules and even other PLCs. These modules can also use RS232, such as an operator interface or HMI, a com...