Ideally an RS485 system consists of a single linear cable (no branches) with 120 ohm resistors connected across the 2 wires at each end of the cable. RS485 can handle speeds of over 10 Mbits per second and line lengths of over 1 km.
Also to know is, what is rs485 used for?
The RS485 standard is used when high speed serial data communications of 10 Mbps is needed. RS485 was developed to provide high speed data. The standard is defined by industry telecommunications bodies and may be referred to most commonly as RS485, but references to EIA485 or TIA-485 may also be seen.
Also, what voltage is rs485?
Characteristics of RS485 compared to RS232, RS422 and RS423
| ||RS232 ||RS485 |
|Driver load impedance ||3..7 kΩ ||54 Ω |
|Receiver input sensitivity ||±3 V ||±200 mV |
|Receiver input range ||±15 V ||–7..12 V |
|Max driver output voltage ||±25 V ||–7..12 V |
Does rs485 need a ground?
RS485 is a differential signal so no common ground is required. Wikipedia says: "Connection of a third wire between the source and receiver may be done to limit the common mode voltage that can be impressed on the receiver inputs."
Is rs485 an Ethernet?
Why RS-485 Survived Ethernet Ethernet (IEEE 802.3) is the most broadly used network protocol these days. It is also a serial communication standard. The major drawback of RS-485 is its limited communication speed which is maxed out at 10 Mbaud. RS-485 is designed for a master/slave topology.