Rs 422 Cable Connection

This represents the rs 422 connections of a device card or converter.

Rs 422 cable connection.

How long can i run a cable for rs 422 or rs 485 communications. Normally this connection is made at one end of the main cable. Several sources provide a log log plot of cable length vs. Rs422 serial port connector pin layout.

Rs 422 is a serial communications standard that provides asynchronous communication capabilities such as hardware flow control software flow control and parity check. Earth connection of the shield. Unlike rs 232 rs 422 is capable of data transmissions over long distances up to 4000 feet. Rs 422 also known as tia eia 422 is a technical standard originated by the electronic industries alliance that specifies electrical characteristics of a digital signaling circuit.

Dls c fls c rs 422 connection to rs 485 page 4 7 laser distance sensors illustration 1. Signal ground is used as a common reference. This is a 4 wire connection one pair of twisted wires is used for receive the other for transmit. Rs 485 a descendant of rs 422 that can be used as a bus in multidrop configurations mil std 188 a system like rs 232 but with better impedance and rise time control eia 530 a high speed system using rs 422 or rs 423 electrical properties in an eia 232 pinout configuration thus combining the best of both.

Foreword this manual contains text diagrams and explanations which will guide the reader in the. Figure 1 applies to many ethernet serial servers and a few b b rs 485 converters such as the 485sd9tb 485lprj 485sd9r 485sd9rj. The cable shield must be earthed only in one point. Several dls fls c h sensors connected to a rs 485 line.

It was intended to replace the older rs 232c standard with a standard that offered much higher speed better immunity from noise and longer cable lengths. Manufacturers of equipment with rs 422 and rs 485 interfaces note a maximum of 4000 feet 1200m but the higher the communication frequency the shorter the maximum cable length. Rs 422 systems can transmit data at rates as high as 10. The termination resistance must be equal to the cable impedance recommended.

These cable can take a variety of forms in terms of the physical methods used for construction as well as the number of connections that are incorporated within the overall rs232 cable. Whenever rs232 is used rs232 cables will be needed to provide the required electrical connection. Go back to modbus rs485 cabling rules 8.