A common 2-wire serial communications link, used for industrial applications due to it's high noise immunity, long distance, and multi-drop capability. Many pumps use this connection type for communication.
RS-485 is an upgraded version of RS-422 that supports up to 32 devices on the same connection. RS-485 is an electrical specification of a two-wire, half-duplex, multipoint serial connection. It enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (up to 10Mbit/s), and as it uses a differential balanced line over twisted pair (like RS-422), it can span relatively large distances (4000 feet or 1200 meters). RS-485 only specifies the electrical characteristics of the driver and the receiver. It does not specify or recommend any data protocol.
is used for multipoint communications. Similar to Ethernet networks which use coaxial cable, most RS 485 systems use Master/Slave architecture, where each slave unit has its unique address and responds only to packets addressed to this unit. These packets are generated by Master (e.g. PC), which periodically polls all connected slave units.
A physical electrical interface standard established by the Electronic Industries Association (EIA)
Standard defined by EIA, aka. EIA-485. Standard for electrical characteristics of generators and receivers for use in balanced multipoint systems.
The EIA standard for multi-point communication. http://www.arcelect.com/485info.htm
Standard for serial transfer of PC data. Comparable with the RS 232 - standard. Here, also 1.200 m can be bridged. There are complying modifiers on the market which can transform a RS 232 signal into a RS 485 standard. To top
RS-485 is an enhanced version of RS-422. It is compatible to RS-422 interface and provides 2 wire bus topology. By using RS-485 2 wire bus, you may establish a most economic network system. However, RS-485 only defines electronic signal specifications, users must define software protocol for 2 wire communication by themself.
RS-485 defines a system for interconnecting several data terminals to a common twisted pair balanced line. The interconnection is similar to RS-422, but all of the connected devices listen with their transmitters off. The host transmits a signal which addresses one of the devices. The addressed device turns on its data transmitter and transmits its data or response.
An industry standard for a network protocol used for factory automation and other applications. NVE makes RS-485 network signal couplers that combine spintronics coupling with network protocol functions in a single small package. SRAM (Static Random Access Memory) A conventional memory that is faster than DRAM but lower in density. Used for high-speed operations such as digital signal processing in cellphones and caches in computers. MRAM has the potential to match the speed of SRAM but with nonvolatility and much higher bit density.
A very robust serial data interchange standard. An RS-485 communications channel is a party-line (multi-drop) digital signal and, like RS-422, is balanced. It is very immune to interference, making it more reliable in demanding environments. It is usable at distances of 4,000 feet and beyond.
An enhanced version of RS-422, RS-485 allows up to 32 devices to communicate at half-duplex on a single pair of wires, plus a ground wire, at distances up to 1200 meters (4000 feet). Data is transmitted differentially on two wires twisted together, referred to as a "twisted pair." The properties of differential signals provide high noise immunity and long distance capabilities. An RS-485 network can be configured two ways, two-wire or four-wire. In a two-wire network the transmitter and receiver of each device are connected to opposite ends of a twisted pair. Four-wire networks have one master port with the transmitter connected to each of the "slave" receivers on one twisted pair. The "slave" transmitters are all connected to the "master" receiver on a second twisted pair.
A multidrop hardware configuration for serial communications. There is no intrinsic method of bus collision detection in RS-485, so higher layers in the protocol stack must take this into account.| | Scalable UPS A UPS that allows for expandability; for example, enables a UPS to accommodate a larger load by purchasing additional power modules.
A serial communications standard that provides for addressing of devices, so multiple devices can co-exist at individual addresses on the same pair of wires.
A data protocol used for transmitting data over longer distances more reliably.
Standard for multipoint interconnections.
The standard describing the electrical characteristics of a balanced interface used as a bus for master/slave operation. Allows up to 32 users to bridge onto the line (as opposed to RS-422's need to daisy-chain the interconnections).
Standard for allowing multiple devices to share a common set of serial data communication lines. The signaling is very similar to RS-422. The maximum number of devices allowed is 32.
Standard protocol for serial multi-point communication lines.
EIA serial interface standard for multipoint lines. Unlike its predecessors (RS-232, RS-422, etc.), RS-485 uses a tri-state driver. The third state the other interfaces lack is an off condition that allows equipment to communicate over shared wiring while another device sits quietly. It's tolerant to electrical noise, which makes it ideal for industrial users like manufacturing facilities and airports. RS-485 supports long cabling distances up to 4000 feet (1219.2 m) at 100 Kbps.
is an upgrade of RS-422. It also uses differential signals on twisted-pair cables, for distances up to 4000 feet without a repeater. RS-485 can be configured for either half duplex (using one twisted pair) or full duplex (using two twisted pairs). RS-485 is often used in industrial applications because of its noise immunity and long-distance capability. Opto 22 serial-based I/O units use RS-485. In addition, Opto 22's SNAP PAC System can communicate directly with serial devices that use RS-485/422, through a SNAP-SCM-485-422 serial communication module on the I/O unit.