stop bit - определение. Что такое stop bit
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Что (кто) такое stop bit - определение

FORM OF SERIAL COMMUNICATION LACKING SYNCHRONIZATION CONTROL SIGNALS
Asynchronous communications system; Start-stop transmission; Stop bit; Asynchronous serial; Start bit; Asynchronous start-stop; Start-stop signalling; Asynchronous serial protocol
  • order of data bits]], the presence or absence of a parity bit, the form of parity (even or odd) and the transmission speed must be pre-agreed by the communicating parties. The "stop bit" is actually a "stop period"; the stop period of the transmitter may be arbitrarily long. It cannot be shorter than a specified amount, usually 1 to 2 bit times. The receiver requires a shorter stop period than the transmitter. At the end of each character, the receiver stops briefly to wait for the next start bit. It is this difference which keeps the transmitter and receiver synchronized.
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stop bit         
In serial communications, where each bit of the message is transmitted in sequence, stop bits are extra "1" bits which follow the data and any parity bit. They mark the end of a unit of transmission (normally a byte or character). For example, characters on an EIA-232 serial line may have one or two stop bits added. Some UARTs even allow for 1.5 stop bits but one is probably the most commonly used. A serial connection may be described as, for example, "8N1" which means eight data bits, no parity and one stop bit. (1995-01-24)
start bit         
<protocol> A bit which signals the start of transmission of a character on a serial line. For an RS-423 signal, the line is normally at logical zero which there is no data and the start bit is a logical one. The zero-one transition tells the receiver when to start sampling the signal to extract the data bits. [Is this upside-down?] (1995-02-02)
Asynchronous serial communication         
Asynchronous serial communication is a form of serial communication in which the communicating endpoints' interfaces are not continuously synchronized by a common clock signal. Instead of a common synchronization signal, the data stream contains synchronization information in form of start and stop signals, before and after each unit of transmission, respectively.
stop         
WIKIMEDIA DISAMBIGUATION PAGE
Stops; Stop (song); STOP; Stop!; Stop (disambiguation); Stop! (song); Stop! (disambiguation); STOP (disambiguation); Stop (album)
(stops, stopping, stopped)
Frequency: The word is one of the 700 most common words in English.
1.
If you have been doing something and then you stop doing it, you no longer do it.
He can't stop thinking about it...
I've been told to lose weight and stop smoking...
I stopped working last year to have a baby...
Does either of the parties want to stop the fighting?...
She stopped in mid-sentence.
VERB: V -ing, V -ing, V -ing, V n, V
2.
If you stop something happening, you prevent it from happening or prevent it from continuing.
He proposed a new diplomatic initiative to try to stop the war...
If the fire isn't stopped, it could spread to 25,000 acres...
I think she really would have liked to stop us seeing each other...
Motherhood won't stop me from pursuing my acting career...
VERB: V n, V n, V n -ing, V n from -ing
3.
If an activity or process stops, it is no longer happening.
The rain had stopped and a star or two was visible over the mountains...
The system overheated and filming had to stop...
VERB: V, V
4.
If something such as machine stops or is stopped, it is no longer moving or working.
The clock had stopped at 2.12 a.m...
Arnold stopped the engine and got out of the car...
VERB: V, V n
5.
When a moving person or vehicle stops or is stopped, they no longer move and they remain in the same place.
The car failed to stop at an army checkpoint...
He stopped and let her catch up with him...
The event literally stopped the traffic...
= halt
VERB: V, V, V n
6.
If something that is moving comes to a stop or is brought to a stop, it slows down and no longer moves.
People often wrongly open doors before the train has come to a stop...
He slowed the car almost to a stop.
= halt
N-SING: to a N
7.
If someone does not stop to think or to explain, they continue with what they are doing without taking any time to think about or explain it.
She doesn't stop to think about what she's saying...
There is something rather strange about all this if one stops to consider it...
People who lead busy lives have no time to stop and reflect.
= pause
VERB: V to-inf, V to-inf, V
8.
If you say that a quality or state stops somewhere, you mean that it exists or is true up to that point, but no further.
The cafe owner has put up the required 'no smoking' signs, but thinks his responsibility stops there...
= end
VERB: V adv
9.
A stop is a place where buses or trains regularly stop so that people can get on and off.
They waited at a bus stop.
N-COUNT: oft supp N
10.
If you stop somewhere on a journey, you stay there for a short while.
He insisted we stop at a small restaurant just outside of Atlanta...
VERB: V prep/adv
11.
A stop is a time or place at which you stop during a journey.
The last stop in Mr Cook's lengthy tour was Paris...
N-COUNT: usu with supp
12.
In music, organ stops are the knobs at the side of the organ, which you pull or push in order to control the type of sound that comes out of the pipes.
N-COUNT: usu pl
13.
If you say that someone will stop at nothing to get something, you are emphasizing that they are willing to do things that are extreme, wrong, or dangerous in order to get it.
Their motive is money, and they will stop at nothing to get it.
PHRASE: V inflects [emphasis]
14.
If you pull out all the stops, you do everything you can to make something happen or succeed.
New Zealand police vowed yesterday to pull out all the stops to find the killer.
PHRASE: V inflects
15.
If you put a stop to something that you do not like or approve of, you prevent it from happening or continuing.
His daughter should have stood up and put a stop to all these rumours.
PHRASE: V inflects
16.
If you say that someone does not know when to stop, you mean that they do not control their own behaviour very well and so they often annoy or upset other people.
Like many politicians before him, Mr Bentley did not know when to stop...
PHRASE: know inflects
17.
to stop dead: see dead
to stop short of: see short
to stop someone in their tracks: see track
stop         
WIKIMEDIA DISAMBIGUATION PAGE
Stops; Stop (song); STOP; Stop!; Stop (disambiguation); Stop! (song); Stop! (disambiguation); STOP (disambiguation); Stop (album)
I. v. a.
1.
Close, close up.
2.
Obstruct, close up, render impassable, block, close, blockade.
3.
Hinder, impede, shut in, bring to a standstill, stay, check.
4.
Hinder, repress, restrain, suppress, obstruct, stay, intercept, preclude, thwart, impede, interrupt, lay an embargo on, prevent, delay.
5.
Leave, cease from, desist from, refrain from, leave off, make an end of, discontinue, have done with, give over.
6.
Suspend, arrest, intermit, discontinue, quiet, put an end to, end, terminate.
II. v. n.
1.
Be at a stand-still, come to a stand, come to a stand-still, come to a dead lock, cease progress, halt, stand still.
2.
Cease, desist, forbear, leave off, break off.
3.
(Colloq., U. S.) Tarry, stay, lodge, take lodgings, have lodgings.
III. n.
1.
Pause, rest, intermission.
2.
Interruption, repression, cessation, obstruction, hindrance, check.
3.
Impediment, obstacle, obstruction.
4.
Point, mark of punctuation.
stop         
WIKIMEDIA DISAMBIGUATION PAGE
Stops; Stop (song); STOP; Stop!; Stop (disambiguation); Stop! (song); Stop! (disambiguation); STOP (disambiguation); Stop (album)
¦ verb (stops, stopping, stopped)
1. come or cause to come to an end.
discontinue an action, practice, or habit.
2. prevent from happening or from doing something.
instruct a bank to withhold payment on (a cheque).
refuse to supply as usual.
Boxing defeat (an opponent) by a knockout.
3. cease or cause to cease moving or operating.
(of a bus or train) call at a designated place to pick up or set down passengers.
Brit. informal stay somewhere for a short time.
4. block or close up (a hole or leak).
plug the upper end of (an organ pipe), giving a note an octave lower.
5. obtain the required pitch from (the string of a violin or similar instrument) by pressing at the appropriate point with the finger.
¦ noun
1. an act of stopping.
a place designated for a bus or train to stop.
2. an object or part of a mechanism which prevents movement.
Bridge a high card that prevents the opponents from establishing a particular suit.
Nautical a stopper.
3. Phonetics a consonant produced with complete closure of the vocal tract.
4. a set of organ pipes of a particular tone and range of pitch.
(also stop knob) a knob, lever, etc. in an organ or harpsichord which brings into play a set of pipes or strings of a particular tone and range of pitch.
5. Photography the effective diameter of a lens.
a device for reducing this.
a unit of change of relative aperture or exposure.
Phrases
pull out all the stops make a very great effort to achieve something. [with ref. to the stops of an organ.]
put a stop to cause to end.
stop dead (or short) suddenly cease moving, speaking, or acting.
Phrasal verbs
stop by (or in) call briefly as a visitor.
stop something down Photography reduce the aperture of a lens with a diaphragm.
stop off (or over) pay a short visit en route to one's destination.
stop out Brit. informal stay out later than expected.
stop something out cover an area that is not to be printed or etched.
Derivatives
stoppable adjective
Origin
OE (for)stoppian 'block up (an aperture)', of W. Gmc origin, from late L. stuppare 'to stuff'.
stop         
WIKIMEDIA DISAMBIGUATION PAGE
Stops; Stop (song); STOP; Stop!; Stop (disambiguation); Stop! (song); Stop! (disambiguation); STOP (disambiguation); Stop (album)
I
n.
halt
cessation
1) to make a stop
2) to put a stop to (the teacher put a stop to the cheating)
3) to bring to a stop (the driver brought the bus to a stop)
4) to come to a stop (the train came to a stop)
5) an abrupt, sudden; brief; dead; full; smooth stop
6) a flag (AE), request (BE); regular, scheduled; unscheduled; whistle (AE) ('very brief') stop
7) a bus; pit; streetcar (AE), tram (BE) stop
8) (misc.) to miss one's stop
place for resting
9) a truck stop (AE; BE has transport cafe)
punctuation mark
10) a full stop (BE; AE has period)
II
v.
1) to stop short
2) (D; tr.) to stop from (to stop smb. from doing smt.)
3) (G) they stopped talking
4) (BE) (J) to stop smb. doing smt.
5) (K) I can't stop his interrupting
6) (misc.) to stop dead in one's tracks; to stop at nothing ('to allow no scruples to interfere with one's efforts to achieve an end'); they stopped (in order) to chat
Stop         
WIKIMEDIA DISAMBIGUATION PAGE
Stops; Stop (song); STOP; Stop!; Stop (disambiguation); Stop! (song); Stop! (disambiguation); STOP (disambiguation); Stop (album)
·vi To cease from any motion, or course of action.
II. Stop ·vt To make fast; to Stopper.
III. Stop ·vi To cease to go on; to halt, or stand still; to come to a stop.
IV. Stop ·vt To point, as a composition; to Punctuate.
V. Stop ·vt To Obstruct; to render impassable; as, to stop a way, road, or passage.
VI. Stop ·noun That which stops, impedes, or obstructs; as obstacle; an impediment; an Obstruction.
VII. Stop ·vt To close, as an aperture, by filling or by obstructing; as, to stop the ears; hence, to stanch, as a wound.
VIII. Stop ·noun The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
IX. Stop ·noun The depression in the face of a dog between the skull and the nasal bones. It is conspicuous in the bulldog, pug, and some other breeds.
X. Stop ·vi To spend a short time; to reside temporarily; to Stay; to Tarry; as, to stop with a friend.
XI. Stop ·noun The act of stopping, or the state of being stopped; hindrance of progress or of action; cessation; repression; interruption; check; obstruction.
XII. Stop ·noun A device, or piece, as a pin, block, pawl, ·etc., for arresting or limiting motion, or for determining the position to which another part shall be brought.
XIII. Stop ·vt To regulate the sounds of, as musical strings, by pressing them against the finger board with the finger, or by shortening in any way the vibrating part.
XIV. Stop ·noun A point or mark in writing or printing intended to distinguish the sentences, parts of a sentence, or clauses; a mark of punctuation. ·see Punctuation.
XV. Stop ·vt To arrest the progress of; to Hinder; to Impede; to shut in; as, to stop a traveler; to stop the course of a stream, or a flow of blood.
XVI. Stop ·noun In the organ, one of the knobs or handles at each side of the organist, by which he can draw on or shut off any register or row of pipes; the register itself; as, the vox humana stop.
XVII. Stop ·noun The closing of an aperture in the air passage, or pressure of the finger upon the string, of an instrument of music, so as to modify the tone; hence, any contrivance by which the sounds of a musical instrument are regulated.
XVIII. Stop ·noun A member, plain or molded, formed of a separate piece and fixed to a jamb, against which a door or window shuts. This takes the place, or answers the purpose, of a rebate. Also, a pin or block to prevent a drawer from sliding too far.
XIX. Stop ·noun Some part of the articulating organs, as the lips, or the tongue and palate, closed (a) so as to cut off the passage of breath or voice through the mouth and the nose (distinguished as a lip-stop, or a front-stop, ·etc., as in p, t, d, ·etc.), or (b) so as to obstruct, but not entirely cut off, the passage, as in l, n, ·etc.; also, any of the consonants so formed.
XX. Stop ·vt To hinder from acting or moving; to prevent the effect or efficiency of; to cause to cease; to Repress; to Restrain; to Suppress; to Interrupt; to Suspend; as, to stop the execution of a decree, the progress of vice, the approaches of old age or infirmity.
Bit (horse)         
  • Horse skull showing the large gap between the front teeth and the back teeth. The bit sits in this gap, and extends beyond from side to side.
TYPE OF HORSE TACK
Horse bit; Horse bits; Champing at the bit; Chomping at the bit; Horse's bit; Horsebit
The bit is an item of a horse's tack. It usually refers to the assembly of components that contacts and controls the horse's mouth, and includes the shanks, rings, cheekpads and mullen, all described here below, but it also sometimes simply refers to the mullen, the piece that fits inside the horse's mouth.
request stop         
  • A request stop (''zastávka na znamení'') on [[Prague]] city bus line 151
  • [[Wondabyne railway station]] is a request stop, located north of Sydney.
TYPE OF RAILWAY STOP
Whistle stop; Whistlestop; Flag stop; Flagstop; Flag station; Train halt; Whistle-stop; Request stops; Optional stop; Flag-stop
¦ noun Brit. a bus stop at which the bus halts only if requested by a passenger or if hailed.

Википедия

Asynchronous serial communication

Asynchronous serial communication is a form of serial communication in which the communicating endpoints' interfaces are not continuously synchronized by a common clock signal. Instead of a common synchronization signal, the data stream contains synchronization information in form of start and stop signals, before and after each unit of transmission, respectively. The start signal prepares the receiver for arrival of data and the stop signal resets its state to enable triggering of a new sequence.

A common kind of start-stop transmission is ASCII over RS-232, for example for use in teletypewriter operation.