EIA-485


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EIA-485

(communications, standard)
(Formerly "RS-485") An EIA serial line standard which specifies 2-wire, half-duplex, differential line, multi-point communications. Maximum cable length is 1200m. Maximum data rates are 10Mbps at 1.2m or 100Kbps at 1200m. EIA-485 can implement a truly multi-point communications network, and specifies up to 32 drivers and 32 receivers on a single (2-wire) bus.

Differential SCSI uses EIA-485.

Details on RS-232, 422, 423, and 485.
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3 (Ethernet), copper base, cat 7 inclusive Network infrastructure components - 1 pc control system installed on LCD touch panel PC installed in control cabinet front, - Connection to a home network with remote access via WEB-Access, - ModBus RTU via EIA-485 for connection of heat pump management system, - M-Mus for recording consumption values, - BACnet over IP for connection of 3 ventilation centers, - Ring bus system for controlling and monitoring approx.
The BACnet system used for this hotel is MS/TP on EIA-485 twisted pair wire.
Communication varies from RS422/423 and EIA-485 serial-communication to interconnectivity solutions including gateways and integrated DeviceNet, Ethernet and Palm for supporting applications from a remote location.
A rear serial communications port is available as either an EIA-232 or an EIA-485 interface.
It comes equipped with one switch-selectable serial port and can communicate via EIA-232, EIA-422 or EIA-485.
It offers wired EIA-232, EIA-485 and Ethernet connectivity as well as wireless Zigbee connectivity to remote sensors and thermostats.
The hard-wired system works through dedicated EIA-485 (formerly called RS485) cabling or through an Ethernet connection that uses an existing network.
For the data acquisition in the measurement system are used the Advantech ADAM 4015 modules, which are able to communicate with the master system using the ModBus/ASCII protocol over the EIA-485 industrial bus.
Communication varies from RS-422/423 and EIA-485 serial-communication to interconnectivity solutions including gateways and integrated DeviceNet, Ethernet and Palm for supporting applications from a remote location.
With the UltraPort SI, Perle is the first vendor to incorporate EIA-232, EIA-422 and EIA-485 interfaces on a single PCI serial card and provide the ability to individually configure each interface type using software commands.
The rational from the addendum sums things up: Although EIA-485 practice allows for a third wire to connect transceiver common or reference points together so the receiver common mode rejection voltage limit is not exceeded, the BACnet specification in Clause "9.
The system shall utilize intelligent distributed control modules, which communicate over an EIA-485 BACnet controller network The system shall provide the Direct Digital Control (DDC), Energy Management and Building Automation System for the air conditioning, heating and ventilating systems and shall interface with other microprocessor based building subsystems.