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	RS485, specifications and in depth tutorial
		RS485 is the most versatile communication standard in the standard series defined by the EIA, as it performs well on all four points.
		RS485 repeaters are also available which make it possible to increase the number of nodes to several thousands, spanning multiple kilometers.
		RS485 is used as the electrical layer for many well known interface standards, including Profibus and Modbus.
	www.lammertbies.nl /comm/info/RS-485.html#char (1377 words)

	RS485 (Site not responding. Last check: 2007-11-02)
		RS485 is a balanced serial interface for the transmission of digital data.
		With RS485 it is possible to set-up a multi-point application with one master and several slaves.
		This means that when RS485 is used in a 4-wire application and the transmit and receive circuits are thus separated that you can add up to 64 devices on a segment.
	ckp.made-it.com /rs485.html (353 words)

	RS485, RS232, RS422, RS423, Quick Reference Guide
		RS485 meets the requirements for a truly multi-point communications network, and the standard specifies up to 32 drivers and 32 receivers on a single (2-wire) bus.
		RS485 extends the common mode range for both drivers and receivers in the "tri-state" mode and with power off.
		Also, RS485 drivers are able to withstand "data collisions" (bus contention) problems and bus fault conditions.
	www.rs485.com /rs485spec.html (1045 words)

	RS485 Tech info
		RS485 will support 32 drivers and 32 receivers (we are talking about bi-directional - half duplex - multi-drop communications over a single or dual twisted pair cable !!).
		The typical use for RS485 is a single PC connected to several addressable devices that share the same cable.
		The RS232 may be converted to RS485 with a simple interface converter - it can have optical isolation and surge suppression.
	www.arcelect.com /RS485_info_Tutorial.htm (1783 words)

	Eurotherm \| Knowledge \| RS232 / RS422 / RS485 (Site not responding. Last check: 2007-11-02)
		The RS485 standard allows one or more instruments to be connected (multi-dropped) using a two wire connection, with cable length of up to 1200M.
		The balanced differential signal transmission is less prone to interference and should be used in preference to RS232 in noisy environments.
		Although RS485 is commonly referred to as a ‘two wire’ connection, a separate cable is often provided for linking the circuit commons.
	www.eurotherm.co.uk /uk/eng/Knowledge/Communications/RS232.htm (339 words)

	RS232-to-RS485 Converter . User’s Guide
		A two-wire RS485 is a half duplex serial interface that utilizes a differential pair of wires to carry signal to long distance.
		It is the relative potential difference between the RS485 "+" and the "-" that determines whether a signal bit is a ‘0’ or a ‘1’.
		The RS485 transmit/receive state is directly controlled by the logic state of the /RTS signal on its RS232 interface.
	scmstore.com /english/adap485/tech.htm (1132 words)

	RS485. RS485 Converters (Site not responding. Last check: 2007-11-02)
		RS485 Converters are devices which enable connectivity between pieces of equipment which operate different communications protocols.
		As an example, RS232 devices may be connected to RS485 devices using protocol converters.
		RS485 also has multi drop network capability (up to 32 nodes).
	www.bb-europe.com /rs485/rs485_converters.html (152 words)

	The educational encyclopedia, rs232-485 (Site not responding. Last check: 2007-11-02)
		RS422 RS485 application note the purpose of this application note is to describe the main elements of an RS422 and RS485 system
		RS485 Bus Systems The RS485 interface is - like the RS422 interface - designed for serial high-speed data transmission over long distances and is widely used in industrial applications
		RS-485 Interface The RS-485 is the recommend standard by the Electronic Industries Association (EIA) that specifies the electrical characteristics of generators and receivers that may be employed for the interchange of binary signals in multipoint interconnection of digital equipments,...
	users.telenet.be /educypedia/computer/rs232485.htm (516 words)

	RS232-to-RS485 Converter. RS232 to RS485 Adapter
		For programming an PLC via its RS485 port so that its RS232 port can be freed for connecting to other devices such as HMI, SCADA, barcode scanner, smart card readers, etc.
		To transparently convert the PLC's RS485 port into an additional RS232 port for interfacing to third party RS232 devices.
		For programming an SCMT PLC via its RS485 port so that its RS232 port can be freed for connecting to other devices such as HMI, SCADA, barcode scanner, smart card readers, etc.
	www.scmstore.com /english/adap485 (394 words)

	Technman Electronics Ltd - RS485 And The 5001 Automatic Converter
		This is easily and economically achieved by the use of a Control-it 5001 RS232 To RS485 converter.
		The Control-it 5001 converter is designed to take advantage of this cost effective RS485 protocol whilst minimising line turnaround time, in order to increase overall data throughput by up to 80% over similar converters.
		To the right of 'C' the RS485 line is once again floating and available to any unit on the line to use.
	www.technman.com /articles/5001adv/5001adv.htm (824 words)

	Beckhoff Bus Terminal - RS485/RS232 Bus Coupler BK8000, BK8100
		The Bus Couplers BK8000 and BK8100 use the physics of the RS485 or RS232C (V.24) specification for data transmission.
		Application of the Bus Coupler with a serial interface is suited to those cases in which the use of a fieldbus system can be omitted.
		The input data from one device are copied directly to the outputs of the other, without the aid of an additional master – and vice versa.
	www.beckhoff.com /english/busterm/bk8000.htm (465 words)

	PCB Layout (485 converter) - A tutorial
		This page might be of interest to new designers wanting to learn principles, or to potential clients wanting to understand our processes more thoroughly.
		The project we have chosen as our example is an RS232 to RS485 converter.
		This is a often needed device which can demonstrate a lot of principles of circuit design, and hopefully the finished project will be useful to some people, just as it stands.
	www.airborn.com.au /layout/232cnv.html (217 words)

	ATI RS485 is AMD Socket M2 ready
		AMD is starting its move toward DDR 2 capable CPUs and ATI will be there to follow.
		The chipset is called the RS485 and it supports one single graphic slot only.
		ATI RS485 should have some mode advanced graphic core inside of the core logic but we still have many details about it.
	www.theinquirer.net /?article=27908 (241 words)

	RS485 Converter
		Any RTS controlled RS485 converter (and, like ours, that is how most of them work!) will only have mediocre performance under windows - and with some RS485 devices at higher baud rates it may well fail to operate.
		RS485 Transmission not just controlled by RTS, but also switched to 'Transmit' whenever the RS232 TxD line goes to space (active).
		If you are just interested in the RS485 converter, there is no reason to go through the whole tutorial - the two diagrams you will need will be the PCB layout and the schematic, and they are both reproduced below.
	www.airborn.com.au /layout/232to485.html (386 words)

	PIC Based SBC, Ethernet, USB, RS232, RS485, CAN BUS, Prototyping, PICMicro
		The RS485 line driver chip used on most of the MicroX Boards is the MAX485 or equivalent chip.
		The RS485 positive bus line is connected to pin 5 of the RJ45 connector, and the negative bus line is connected to pin 4.
		When using the power feature of the RS485 Data and Power Bus, it is VERY important that only one board supplies the power (Has a DC transformer connected to it’s 2.1mm power jack), and all the rest source power from the bus.
	www.modtronix.com /microx/daisy (371 words)

	Salescaster PC Connection > RS485
		For example, a group of signs could be in a Cable network that is connected to a PC via a Modem network.
		In an RS485 sign network, one or more signs are connected with RS485 cabling to a PC using the listed system components.
		RS485 Serial data cable (22AWG shielded, single twisted-pair, with drain wire) connects the units up to 8,000 ft.
	salescaster.com /PCSys.htm (241 words)

	Esis: Converters: RS232/RS422/RS485/ I-Loop/ Fibre Optic/ Radio
		RS485 is a two wire (twisted pair) network used for party lines where several RS485 devices are attached to the same line in daisy chain style (effectively in parallel).
		RS485 termination: The extreme ends of the RS485 line should be terminated with a 120 ohm resistor (i.e.
		In RS485 (2-wire) mode up to 32 receivers can be set up in a multidrop installation, making for a cost effective network configuration.
	www.esis.com.au /Converters/Converters.htm (4165 words)

	Serial Interfaces (RS232 and RS485) - Products and Services - National Instruments
		National Instruments serial interface boards for PCI are asynchronous serial interfaces for communicating with RS232, RS485, and RS422 serial devices.
		National Instruments serial interface boards for PXI are asynchronous serial interfaces for communicating with RS232, RS485, and RS422 serial devices.
		National Instruments Ethernet serial interface device servers are asynchronous serial interfaces for communicating with RS232, RS485, and RS422 serial devices.
	www.ni.com /serial (327 words)

	Automated Aquarium Systems - RS485 Serial Network
		The Electronics Industry Association (EIA) has produced standards for RS485 and RS232 that deal with data communications.
		While the standards bring uniformity to data communications, many areas are not specifically covered and remain as "gray areas" for the user to discover (usually during installation) on his/her own
		The RS232 may be converted to RS485 with a simple interface converter - it can have optical isolation and surge suppression (AAS 7520)
	www.automatedaquariums.com /tec485.htm (975 words)

	IP over RS485 (Site not responding. Last check: 2007-11-02)
		RS485 is used with Modbus protocol for data acquisition.
		However am interested in integrating IP with RS485 so that data transfer is transparent and independent of interfaces.
		You responded to the tail-end of the entire "RS485 communication thread".
	www.control.com /1026169435/index_html (602 words)

	RS485 RS232 USB Converters and Data Acquisition Modules from Integrity Instruments
		RS485 is sometimes termed as RS485 Multidrop LAN since it can connect several devices in a LAN network environment.
		However, I.C. manufacturers have developed RS485 drivers capable of allowing 128 to 255 nodes on an RS485 LAN.
		Quite frankly it is a pain in the posterior because it is a mix of RS485 multidrop and RS422 single ended.
	www.rs-485.com /commspec.asp (977 words)

	ADR Serial Data Acquisition Interfaces ( RS232, RS485, USB to Digital, Analog and Relay I/O )
		RS232 and RS485 ports, 8 single-ended or 4 differential analog inputs, 0 -5 VDC or +/-5VDC.
		RS232 and RS485 ports, 8 single-ended analog inputs, 0 -5 VDC, 0-10VDC, +/-5VDC, +/-10VDC.
		RS232 and RS485 ports, 8 relay contact outputs (0.5A@125VAC 1A@30VDC), 4, TTL or contact input lines, and one event counter which accepts contact or TTL inputs.
	www.ontrak.net /products.htm (660 words)

	RS485 or CAN Expansion for PIC Boards
		Once this board is then connected to the SBC45EC's frontend connector, the RS485 bus can be read and written to via the PIC's USART, for implementing RS485 to FTP, UDP or other types of interfaces.
		This board also can be used to implement a CAN bus interface, by removing the installed RS485 driver chip from the IC1 socket and inserting a CAN driver chip (such as the MCP2551) into the IC2 socket.
		RS485 bus signals, ground and optional positive supply (selected via straps) are made available on a 5-pin 3.81 mm terminal block connector.
	microcontrollershop.com /product_info.php?products_id=982 (331 words)

	USB485i USB485 - USB RS485 Isolated Serial Converters
		The converters take their power from the USB port and therefore require no external power supply, a big advantage in portable and industrial applications.
		They are ideal for use with RS485 two wire networks as another big advantage of the USB485 is that it automatically enables the RS485 transmitter when data is to be transmitted.
		In short an application program written to support RS232 comms with no flow control can be made to interface to RS485 without modification.
	www.mev.co.uk /usb485 (395 words)

	Fieldbus and Ethernet Serial Gateways DeviceNet, Profibus, LonWorks, SDS, RS232, RS422, RS485, Modbus, SAE RS485, and ... (Site not responding. Last check: 2007-11-02)
		Enabling instrument connectivity to industry standard networks easily and cost-effectively are the reasons why many people rely on our serial gateways.
		With standard configurations to convert serial RS232, RS422, RS485, Modbus to DeviceNet™ or Profibus™, our serial gateways are easy to configure to get your instruments up and running quickly.
		CDN067-3 is a compact RS485 to DeviceNet serial gateway which provides a flexible interface between DeviceNet systems and Modbus peripheral equipment.
	www.mksinst.com /CIT1.html (565 words)

	RS485 Analog and Digital I/O Module
		All Integrity Instruments products are guaranteed against defective workmanship and components for the life of the unit.
		This Integrity Instruments data acquisition module uses RS485 communication to access 16 digital I/O points.
		RS485 (8 data bits, no parity, 1 stop bit)
	www.rs-485.com /daqitemw.asp?record=69 (144 words)

	visual basic vb C# serial communications: rs232, rs422, rs485 training tutorials example source code
		For example Profibus is based on RS485 and Profibus runs at speeds up to 12 Mbaud (625 times faster than 19,200 baud).
		The problems with RS422 and RS485 is that the set-up is more difficult: you have to use more expensive cable (for proper impedance and capacitance), properly terminate the ends of the cables, set addresses, etc. But the advantages are longer cable lengths, higher baud rates, and multiple devices share the same communication network.
		Most of the changes for RS422 and RS485 are in the hardware and cabling.
	www.htservices.com /Tools/VBandC/SerialCommunications.htm (4097 words)

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