Serial line - Revision history

Jnc: /* Further reading */ +Comparison of Data Transmission Techniques

2024-07-27T13:41:34Z

‎Further reading: +Comparison of Data Transmission Techniques

Jnc: New cat, +/* See also */

2022-05-23T13:12:35Z

New cat, +‎See also

Jnc: +break

2021-08-05T14:30:39Z

+break

Jnc: move mark/space here

2020-03-21T14:11:55Z

move mark/space here

Jnc: better car

2018-12-13T18:56:15Z

better car

Jnc: +cat

2018-12-13T04:44:56Z

+cat

Jnc: Proper cat

2018-10-21T12:42:03Z

Proper cat

Jnc: Add links

2018-09-12T19:35:02Z

Add links

Jnc: add 'self-clocking' term

2017-10-15T01:57:52Z

add 'self-clocking' term

Jnc: A start

2017-10-14T01:23:27Z

A start

New page

A '''serial line''' is a means of transmitting data in bit serial fashion, often over a communication link such as a telephone line. There are two principal forms:

* [[asynchronous serial line]]s, in which the format is such that the start location of each character can be inferred from the data stream, and
* [[synchronous serial line]]s, where each character starts immediately after the previous one.

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 * [[EIA RS-232 serial line interface‎]]
 * [[EIA RS-422 serial line interface‎]]
 [[Category: Communication Basics]]
 [[Category: Serial Lines]]

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 * [[synchronous serial line]]s, where each character starts immediately after the previous one, and is therefore not self-clocking
-Both serial line [[protocol]]s requires two signal levels: '''idle''' ('''mark''', high [[voltage]]), and '''asserted''' ('''space''', low voltage). (The polarity is a legacy from telegraphy, where the line was held high in order to show that the line was not broken, and that the transmitter was functional.)
+Both serial line [[protocol]]s requires two signal levels: '''idle''' ('''mark''', often high [[voltage]]), and '''asserted''' ('''space''', often low voltage). (The polarity is a legacy from telegraphy, where the line was held high in order to show that the line was not broken, and that the transmitter was functional.)
 If the line is held in the 'asserted' state for longer than a character time, this is called a '''break''' condition, and it can be detected by the receiver and signalled to the user specially. This is often used to [[interrupt]] the computer on the other end of the line.
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 [[Category: Communication Basics]]

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-A '''serial line''' is a means of transmitting data in [[bit]] serial fashion, often over a [[communication link]] such as a telephone line. There are two principal forms:
+A '''serial line''' is a means of transmitting data in [[bit]] [[serial]] fashion, often over a [[communication link]] such as a telephone line. There are two principal forms:
 * [[asynchronous serial line]]s, in which the format is self-[[clock]]ing (i.e. the start location of each character can be inferred from the data stream), and
 * [[synchronous serial line]]s, where each character starts immediately after the previous one, and is therefore not self-clocking
-Both serial line [[protocol]]s requires two signal levels: idle (mark, high), and asserted (space, low). (The polarity is a legacy from telegraphy, where the line was held high in order to show that the line was not broken, and that the transmitter was functional.)
+Both serial line [[protocol]]s requires two signal levels: '''idle''' ('''mark''', high [[voltage]]), and '''asserted''' ('''space''', low voltage). (The polarity is a legacy from telegraphy, where the line was held high in order to show that the line was not broken, and that the transmitter was functional.)
 {{semi-stub}}
 [[Category: Communication Basics]]

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 * [[asynchronous serial line]]s, in which the format is self-[[clock]]ing (i.e. the start location of each character can be inferred from the data stream), and
 * [[synchronous serial line]]s, where each character starts immediately after the previous one, and is therefore not self-clocking
 {{semi-stub}}
 [[Category: Communication Basics]]

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← Older revision		Revision as of 12:42, 21 October 2018
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	* [[synchronous serial line]]s, where each character starts immediately after the previous one, and is therefore not self-clocking		* [[synchronous serial line]]s, where each character starts immediately after the previous one, and is therefore not self-clocking

−	{{stub}}	+	{{semi-stub}}

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 A '''serial line''' is a means of transmitting data in bit serial fashion, often over a communication link such as a telephone line. There are two principal forms:
-* [[asynchronous serial line]]s, in which the format is such that the start location of each character can be inferred from the data stream, and
+* [[asynchronous serial line]]s, in which the format is self-clocking (i.e. the start location of each character can be inferred from the data stream), and
-* [[synchronous serial line]]s, where each character starts immediately after the previous one.
+* [[synchronous serial line]]s, where each character starts immediately after the previous one, and is therefore not self-clocking
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