Serial, RS485 - Revision history

Ravinglunatic: /* External links */

2011-01-29T00:09:37Z

External links

← Older revision		Revision as of 00:09, 29 January 2011
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	*[http://en.wikipedia.org/wiki/EIA-485 EIA-485 From Wikipedia]		*[http://en.wikipedia.org/wiki/EIA-485 EIA-485 From Wikipedia]
	*[http://www.lammertbies.nl/comm/info/RS-485.html Introduction to RS485]		*[http://www.lammertbies.nl/comm/info/RS-485.html Introduction to RS485]




			[[Category:Protocols]]
			[[Category:General Info]]
			[[Category:DIYC Index]]

Wvengineer: /* External links */

2009-03-18T02:33:01Z

External links

← Older revision		Revision as of 02:33, 18 March 2009
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	==External links==		==External links==
	*[http://focus.ti.com/docs/prod/folders/print/sn75176b.html SN75176B Differential Bus Transceiver]		*[http://focus.ti.com/docs/prod/folders/print/sn75176b.html SN75176B Differential Bus Transceiver]
			*[http://www.maxim-ic.com/appnotes.cfm/an_pk/723/ Selecting and Using RS-232, RS-422, and RS-485 Serial Data Standards]
	*[http://www.bb-europe.com/tech_articles/polarities_for_differential_pair_signals.asp Polarities for Differential Pairs]		*[http://www.bb-europe.com/tech_articles/polarities_for_differential_pair_signals.asp Polarities for Differential Pairs]
	*[http://en.wikipedia.org/wiki/EIA-485 EIA-485 From Wikipedia]		*[http://en.wikipedia.org/wiki/EIA-485 EIA-485 From Wikipedia]
	*[http://www.lammertbies.nl/comm/info/RS-485.html Introduction to RS485]		*[http://www.lammertbies.nl/comm/info/RS-485.html Introduction to RS485]

Wvengineer: /* Overview */

2009-03-18T02:15:51Z

Overview

← Older revision		Revision as of 02:15, 18 March 2009
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	==Overview==		==Overview==
	RS-485 is very similar to RS-422 where it is balanced pair communications in order to archive high bit rates over long distances with minimal or no noise introduced into the data. The other improvements over RS-422 was to allow higher speeds and Multi-drop capabilities		RS-485 is very similar to RS-422 where it is balanced pair communications in order to archive high bit rates over long distances with minimal or no noise introduced into the data. The other improvements over RS-422 was to allow higher speeds and Multi-drop capabilities
			<BR><BR>
	EIA-485 only specifies electrical characteristics of the driver and the receiver. It does not specify or recommend any data protocol. EIA-485 enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (35 Mbit/s up to 10 m and 100 kbit/s at 1200 m). Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 metres).		EIA-485 only specifies electrical characteristics of the driver and the receiver. It does not specify or recommend any data protocol. EIA-485 enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (35 Mbit/s up to 10 m and 100 kbit/s at 1200 m). Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 metres).

Wvengineer: /* Overview */

2009-03-18T02:15:35Z

Overview

← Older revision		Revision as of 02:15, 18 March 2009
Line 1:		Line 1:
	==Overview==		==Overview==
	RS-485 is very similar to RS-422 where it is balanced pair communications in order to archive high bit rates over long distances with minimal or no noise introduced into the data.		RS-485 is very similar to RS-422 where it is balanced pair communications in order to archive high bit rates over long distances with minimal or no noise introduced into the data. The other improvements over RS-422 was to allow higher speeds and Multi-drop capabilities

	EIA-485 only specifies electrical characteristics of the driver and the receiver. It does not specify or recommend any data protocol. EIA-485 enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (35 Mbit/s up to 10 m and 100 kbit/s at 1200 m). Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 metres).		EIA-485 only specifies electrical characteristics of the driver and the receiver. It does not specify or recommend any data protocol. EIA-485 enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (35 Mbit/s up to 10 m and 100 kbit/s at 1200 m). Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 metres).

Wvengineer: /* Pinouts */

2009-03-18T02:14:08Z

Pinouts

← Older revision		Revision as of 02:14, 18 March 2009
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	==Pinouts==		==Pinouts==
	EIA-485 or commonly refered as rs485 does not specify any connector or pinout. Circuits may be terminated on screw terminals, D-subminiature connectors, or other types of connectors.		EIA-485 or commonly refered as rs485 does not specify any connector or pinout. Circuits may be terminated on screw terminals, D-subminiature connectors, or other types of connectors.
			<BR><BR>

	The EIA-485 differential line consists of two pins:		The EIA-485 differential line consists of two pins:

Wvengineer: /* External links */

2009-03-18T02:13:44Z

External links

← Older revision		Revision as of 02:13, 18 March 2009
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	==External links==		==External links==
	*[http://focus.ti.com/docs/prod/folders/print/sn75176b.html SN75176B Differential Bus Transceiver]		*[http://focus.ti.com/docs/prod/folders/print/sn75176b.html SN75176B Differential Bus Transceiver]
			*[http://www.bb-europe.com/tech_articles/polarities_for_differential_pair_signals.asp Polarities for Differential Pairs]
	*[http://en.wikipedia.org/wiki/EIA-485 EIA-485 From Wikipedia]		*[http://en.wikipedia.org/wiki/EIA-485 EIA-485 From Wikipedia]
	*[http://www.lammertbies.nl/comm/info/RS-485.html Introduction to RS485]		*[http://www.lammertbies.nl/comm/info/RS-485.html Introduction to RS485]

Wvengineer: /* Overview */

2009-03-18T02:12:53Z

Overview

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 </TABLE>
 </CENTER>
 ==Advantages & Disadvantages==

Wvengineer: /* Advantages & Disadvantages */

2009-03-18T02:08:40Z

Advantages & Disadvantages

← Older revision		Revision as of 02:08, 18 March 2009
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	Advantages of RS-422 and RS-485:		Advantages of RS-422 and RS-485:
	<UL>		<UL>
	<LI>Higher data rates up to ~~10Mbps~~		<LI>Higher data rates up to 35Mbps
	<LI>Longer cable lengths up to 4000 Feet		<LI>Longer cable lengths up to 4000 Feet
	<LI>Noise rejection or total noise immunity		<LI>Noise rejection or total noise immunity

Wvengineer: /* Overview */

2009-03-18T01:52:56Z

Overview

← Older revision		Revision as of 01:52, 18 March 2009
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	<CENTER>		<CENTER>
	<TABLE Width="~~550~~">		<TABLE Width="90%">
	<TR><TD>In this image we are showing balanced differential communications where noise that is induced is canceled out by each other by the opposing pair basically being at 180 degrees out of phase in relation of each other at all times, thus allowing to achieve very high baud rates over greater distances.</TD><TD>[[Image:Twisted_immunity.png]]</TD></TR>		<TR><TD>In this image we are showing balanced differential communications where noise that is induced is canceled out by each other by the opposing pair basically being at 180 degrees out of phase in relation of each other at all times, thus allowing to achieve very high baud rates over greater distances.</TD><TD Width="30"></TD><TD>[[Image:Twisted_immunity.png]]</TD></TR>
	</TABLE>		</TABLE>
	</CENTER>		</CENTER>

Wvengineer: /* Advantages & Disadvantages */

2009-03-17T21:25:42Z

Advantages & Disadvantages

← Older revision		Revision as of 21:25, 17 March 2009
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	Disadvantages of RS-422 and RS-485:		Disadvantages of RS-422 and RS-485:
	<UL>		<UL>
	<LI>Only one transmitter for most applications		<LI>Only one transmitter for most applications (applies only to RS-422)
	<LI>More cabling required compared to RS-232		<LI>More cabling required compared to RS-232
	<LI>Not as common compared to RS-232		<LI>Not as common compared to RS-232