Common questions

What is a null serial cable?

What is a null serial cable?

A null modem serial cable (frequently called a crossover cable) is used to connect two DTE devices together without the use of a DCE device in between. For this to happen, the Transmit (TXD) and Receive (RXD) pins on one of the serial connectors are flipped.

What is RS232 pinout?

Below is the pinout of a typical standard male 9-pin RS232 connector, this connector type is also referred to as a DB9 connector. A computer’s serial COM port (DTE) is usually a male port as shown below, and any peripheral devices you connect to this port usually has a female connector (DCE).

Which pins are used when the RS232 communication is implemented?

The RS232 protocol uses a 9 pin serial port that can have either male or female connectors. The most recent version of the protocol is known as RS232C.

How do you use a null modem cable?

The null modem cable (crossover cable) should be used when interfacing between a serial port and a DTE device. To enable handshaking between the two devices, the Request to Send (RTS) pin of one device must be connected to the Clear to Send (CTS) pin of the other device.

What is a RS232 and RS232 pinout connector?

RS232 connector is a port used for data exchange between equipments. RS232 uses serial communication protocol where data exchange is done bit by bit. Although RS232 is later replaced by faster USB (Universal Serial Bus); it is still popular in some areas. RS232 used to have 25 pin, now it is shrunk to just 9 pin.

How many pins is RS232?

9 pins
The original pin layout for RS232 was developed for a 25 pins sub D connector. Since the IBM-AT, 9 pins RS232 connectors are commonly used.

How many pins are in RS232?

When configuring an RS232 connector which pin is used for data set ready information?

RS232 used to have 25 pin, now it is shrunk to just 9 pin….RS232 Pin Configuration.

Pin Number Pin Name Description
8 CTS Clear To send(Set by MODEM to tell PC that it is ready to receive data)

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Ruth Doyle