4/18/2021 0 Comments Serial Communication Interface
There are 5 pins on the top row and 4 pins in the bottom row.While in parallel communication the data is transmitted in a byte (8 bit) or character on several data lines or buses at a time.Serial communication is slower than parallel communication but used for long data transmission due to lower cost and practical reasons.Clock pulse is a signal used for synchronization of operation in an electronic system.
![]() In telephone lines, the baud rates will be 14400, 28800 and 33600. For example, If 011 is a number the parity bit0, i.e., even parity and the parity1, i.e., odd parity. As it obtains the voltage for the path used for the data exchange between the devices. ![]() As EIA defines, the RS232 is used for connecting Data Transmission Equipment (DTE) and Data Communication Equipment (DCE). The microcontrollers are not able to handle such kind of voltage levels, connectors are connected between RS232 signals. Serial Communication Interface Serial Port AndThese connectors are known as the DB-9 Connector as a serial port and they are of two types Male connector (DTE) Female connector (DCE). It is called as ON or spacing (high voltage level) whereas Binary 1 works with voltages up to -5V to -15Vdc. With its slew rate is up to 30 Vmicrosecond and the maximum bitrate will be 20 kbps. There are two devices connected to each other, (DTE) Data Transmission Equipment (DCE) Data Communication Equipment which has the pins like TXD, RXD, and RTS CTS. Now, from DTE source, the RTS generates the request to send the data. Then from the other side DCE, the CTS, clears the path for receiving the data. After clearing a path, it will give a signal to RTS of the DTE source to send the signal. Now again from DCE source, the request can be generated by RTS and CTS of DTE sources clears the path for receiving the data and gives a signal to send the data. This is the whole process through which data transmission takes place. The start bit is always 0, i.e., 12 V next 5 to 9 characters is data bits. If we use parity bit, then 8 bits data can be transmitted whereas if parity doesnt use, then 9 bits are being transmitted. The stop bits are sent by the transmitter whose values are 1, 1.5 or 2 bits after the data transmission. In DB-25, there are 25 pins available which are used for many of the applications, but some of the applications didnt use the whole 25 pins. So, the 9 pin connector is made for the convenience of the devices and equipments. These are of two types: Male Connector (DTE) Female Connector (DCE).
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