RS232 MCQ Quiz – Objective Question with Answer for RS232

A slightly different serial port called RS232 is used for long-distance communication, otherwise the clock may get skewed. The low voltage signal also affects long-distance communication.

For small distance communication, the clock signal which allows a synchronous transmission of data is more than enough, and the low voltage signal of TTL or CMOS is sufficient for the operation. But for long-distance communication, the clock signal may get skewed and the low voltage can be affected by the cable capacitance. So for long-distance communication RS232 can be used.

The IBM PC has one or two serial ports called the COM1 and the COM2, which are used for the data transmission between the PC and many other peripheral units like a printer, modem, etc.

In RS232, several lines are used for transmitting and receiving data and these also provide control for the hardware handshaking.

The data is transmitted asynchronously in RS232 which enhances long-distance communication, whereas SPI, and I2C offer short-distance communication, and therefore, they are using synchronous data transmission.

The serial interface is divided into two, the physical interface and the electrical interface.

The RS232 is also known as the physical interface and it is also known as EIA232.

The MC1489 is an interface chip that can take a 5V and generate internally the other voltages which are needed to meet the interface specification.

The RS232 is a physical interface. It does not follow the serial protocol.

M-Bus or Motorola Bus is an ideal interface for LCD controllers, A/D converters, EEPROMs, and many other components which can benefit from the faster transmission.