Most computer devices have an RS-232C interface, although its performance is not very good. With a wide range of market support, it will always win. In terms of use, RS-232 does have its advantages: Only 3 wires are needed to transmit data in full duplex between two digital devices. However, RS-232C control is more difficult to control than printer interface using parallel communication. RS-232C uses far more registers than the parallel port. These registers are used to implement serial data transfer and handshake and flow control between RS-232C devices. This article will describe the principles of serial communication and specific software design of PC and MCS-51 respectively.
RS-232C introduction and PC hardware:
RS-232C uses -3 to -25V to represent digital "1", and uses 3V to 25V to represent digital "0". RS-232C is in a logic "1" state when idle. At the beginning of transmission, a start bit is generated first. The start bit is a logic "0" of width, followed by the data to be transmitted, the lowest bit of the data to be transmitted starts to be sent, and the end of the byte is indicated by a stop bit. The end bit is a width. The logical "1" state.
The PC generally uses the 8250 or 16550 as a serial communication controller and uses a 9-pin or 25-pin connector to send out the serial port signal. The signal of this socket is defined as follows:
DB-25DB-9 Signal Name Direction Meaning 23 TXD Output Data Send End 32RXD Input Data Receive End 47RTS Output Request Send (Computer Requires Sending Data) 58CTS Input Clear Send (MODEM Ready To Receive Data) 66DSR Input Data Device Ready 75SG- Signal Ground 81DCD Input Data Carrier Detect 204DTR Output Data Terminal Ready (Computer) 229 RI Input Ring Indicator.
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