difference between router and modem in tabular form

DIFFERENCE BETWEEN ROUTER AND MODEM IN TABULAR FORM SERIAL

Stop bit - a bit indicating the completion of the message transmission, can take the values 1, 1.5 (Data bit = 5), 2.įor example, a reduction of 8E1 means that 8 data bits are transmitted, a parity bit is used in EVEN mode and a stop bit occupies one bit. Always 0 (SPACE), the parity bit will always be 0.Always 1 (MARK), the parity bit will always be 1.Oddness (ODD), takes on such value that the number of units in the message is odd.The parity (EVEN) takes such value that the number of units in the message is even.Parity bit - A bit intended for parity checking. The first bit is the less significant bit.

The start bit is the bit denoting the beginning of the transmission, usually 0.ĭata bits - 5, 6, 7 or 8 bits of data. One message sent over RS-232/422/485 consists of a start bit, several data bits, a parity bit and a stop bit.

The logical '0' (SPACE) corresponds to a voltage in the range from +3 to +15 V.

The logical '1' (MARK) corresponds to a voltage in the range from -3 to -15 V.

Information on the RS-232 interface is transmitted digitally by logical 0 and 1.

This is in contrast to the half-duplex mode, when one link is used to receive and transmit data, which imposes a restriction on simultaneous operation, so in a half-duplex mode at one time, either the reception or transmission of information is possible. The RS-232 interface operates in full-duplex mode, which allows you to send and receive information at the same time, because different lines are used for receiving and transmitting. At a minimum distance, the speed is usually 115.2 kbps, but there is hardware that supports speeds of up to 921.6 kbps. The speed of the RS-232 depends on the distance between the devices, usually at a distance of 15 meters the speed is 9600 bps. The RS-232 interface (TIA / EIA-232) is intended for the organization of data transfer between the transmitter or terminal (Data Terminal Equipment, DTE) and the receiver or communication equipment (Data Communications Equipment, DCE) in the point-to-point scheme. Information transmitted via RS-232, RS-422 and RS-485 interfaces is structured as a protocol, for example, the Modbus RTU protocol is widely used in the industry. You will learn more about this in the article. Typically, TxD, RxD and GND ground lines are used, the remaining lines are needed to control the data flow. * For the RS-232 interface, it is not necessary to use all contact lines. The table shows the main differences between RS-232, RS-422 and RS-485 interfaces.ģ2 (with repeaters larger, usually up to 256) The RS-422 and RS-485 interfaces are widely used in the industry for connecting various equipment.

DIFFERENCE BETWEEN ROUTER AND MODEM IN TABULAR FORM SERIAL

The RS-232 standard is better known as a normal computer COM port or serial port (although Ethernet, FireWire and USB can also be considered as a serial port). The RS-232, RS-422 and RS-485 designations refer to interfaces for digital data transmission. The main differences between RS-232, RS-422 and RS-485

Difference between router and modem in tabular form