Knowledge (XXG)

Serial port

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332: 352: 296: 515: 368: 33: 1953:; some serial ports allow many arbitrary rates to be selected, but the speeds on both sides of the connection must match for data to be received correctly. Bit rates commonly supported include 75, 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 bit/s. Many of these standard modem baud rates are multiples of either 1.2 kbps (e.g., 19200, 38400, 76800) or 0.9 kbps (e.g., 57600, 115200). 316: 485: 180: 2852: 351: 2132:
is done with extra signals, often the RS-232 RTS/CTS or DTR/DSR signal circuits. RTS and CTS are used to control data flow, signaling, for instance, when a buffer is almost full. Per the RS-232 standard and its successors, DTR and DSR are used to signal that equipment is present and powered up so are
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The data/parity/stop (D/P/S) conventional notation specifies the framing of a serial connection. The most common usage on microcomputers is 8/N/1 (8N1). This specifies 8 data bits, no parity, 1 stop bit. In this notation, the parity bit is not included in the data bits. 7/E/1 (7E1) means that an even
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is a method of detecting errors in transmission. When parity is used with a serial port, an extra data bit is sent with each data character, arranged so that the number of 1 bits in each character, including the parity bit, is always odd or always even. If a byte is received with the wrong number of
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printing terminal. The order of bits is not usually configurable within the serial port interface but is defined by the host system. To communicate with systems that require a different bit ordering than the local default, local software can re-order the bits within each byte just before sending and
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The only connector specified in the original RS-232 standard was the 25-pin D-subminiature, however, many other connectors have been used to save money or save on physical space, among other reasons. In particular, since many devices do not use all of the 20 signals that are defined by the standard,
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The advantage of software handshaking is that it can be done with absent or incompatible hardware handshaking circuits and cabling. The disadvantage, common to all in-band control signaling, is that it introduces complexities in ensuring that control messages get through even when data messages are
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Connectors mounted on DTE are likely to be male, and those mounted on DCE are likely to be female (with the cable connectors being the opposite). However, this is far from universal; for instance, most serial printers have a female DB25 connector, but they are DTEs. In this circumstance, the
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Odd parity is more useful than even parity since it ensures that at least one state transition occurs in each character, which makes it more reliable at detecting errors like those that could be caused by serial port speed mismatches. The most common parity setting, however, is
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state. When the receiver's buffers approach capacity, the receiver sends the XOFF character to tell the sender to stop sending data. Later, after the receiver has emptied its buffers, it sends an XON character to tell the sender to resume transmission. It is an example of
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Serial standards provide for many different operating speeds as well as adjustments to the protocol to account for different operating conditions. The most well-known options are speed, number of data bits per character, parity, and number of stop bits per character.
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This list includes some of the more common devices that are connected to the serial port on a PC. Some of these such as modems and serial mice are falling into disuse while others are readily available. Serial ports are very common on most types of
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1s, then it must have been corrupted. Correct parity does not necessarily indicate absence of corruption as a corrupted transmission with an even number of errors will pass the parity check. A single parity bit does not allow implementation of
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training software used a code key connected to the serial port to simulate actual code use; the status bits of the serial port could be sampled very rapidly and at predictable times, making it possible for the software to decipher Morse code.
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to control the flow of data. The XON and XOFF characters are sent by the receiver to the sender to control when the sender will send data, that is, these characters go in the opposite direction to the data being sent. The system starts in the
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for musical instrument control, use serial data rates other than the teleprinter standards. Some serial port implementations can automatically choose a bit rate by observing what a connected device is sending and synchronizing to it.
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Stop bits sent at the end of every character allow the receiving signal hardware to detect the end of a character and to resynchronize with the character stream. Electronic devices usually use one stop bit. If slow electromechanical
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is employed, an overrun receiver might simply fail to receive data from the transmitter. Approaches for preventing this include reducing the speed of the connection so that the receiver can always keep up, increasing the size of
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with a frequency of 1.843200 MHz are sold specifically for this purpose. This is 16 times the fastest bit rate, and the serial port circuit can easily divide this down to lower frequencies as required.
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The individual signals on a serial port are unidirectional and when connecting two devices, the outputs of one device must be connected to the inputs of the other. Devices are divided into two categories:
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Aside from uncommon applications that use the last bit (usually the 9th) for some form of addressing or special signaling, mark or space parity is uncommon, as it adds no error detection information.
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In modern serial ports using a UART integrated circuit, all these settings can be software-controlled. Hardware from the 1980s and earlier may require setting switches or jumpers on a circuit board.
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connectors, the male connectors have protruding pins, and female connectors have corresponding round sockets. Either type of connector can be mounted on equipment or a panel; or terminate a cable.
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A converter from USB to an RS-232 compatible serial port—more than a physical transition, it requires a driver in the host system software and a built-in processor to emulate the functions of the
1433:, some applications used the control lines of a serial port to monitor external devices, without exchanging serial data. A common commercial application of this principle was for some models of 278:, which would have multiple small-scale integrated circuits to implement shift registers, logic gates, counters, and all the other logic needed. As PCs evolved serial ports were included in the 2168:
blocked, and data can never be mistaken for control signals. The former is normally dealt with by the operating system or device driver; the latter normally by ensuring that control codes are
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on pin 1, which is intended to be connected by each device to its own frame ground or similar. Connecting Protective Ground to Signal Ground is a common practice but not recommended.
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The capability to set a bit rate does not imply that a working connection will result. Not all bit rates are possible with all serial ports. Some special-purpose protocols such as
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form, implementing the timing and framing of data specified by the serial protocol in hardware. The IBM PC implements its serial ports, when present, with one or more UARTs.
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is used in circumstances where a transmitter might be able to send data faster than the receiver is able to process it. To cope with this, serial lines often incorporate a
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working over serial data links will typically have higher-level mechanisms to ensure data validity and request retransmission of data that has been incorrectly received.
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The advantage of hardware handshaking is that it can be extremely fast, it works independently of imposed meaning such as ASCII on the transferred data and it is
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Operating systems usually create symbolic names for the serial ports of a computer, rather than requiring programs to refer to them by hardware address.
2743: 2678: 2164:. Its disadvantage is that it requires more hardware and cabling, and both ends of the connection must support the hardware handshaking protocol used. 2882: 2783: 162:) commonly use serial console ports for configuration, diagnostics, and emergency maintenance access. To interface with these and other devices, 2837: 447:
connectors with fewer pins are often used. While specific examples follow, countless other connectors have been used for RS-232 connections.
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for the other connections; it appears on two pins in the Yost standard but is the same signal. The DB-25 connector includes a second
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technique. These early home computers often had proprietary serial ports with pinouts and voltage levels incompatible with RS-232.
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usually asserted at all times. However, non-standard implementations exist, for example, printers that use DTR as flow control.
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represents a string identifying the specific port; the syntax of that string depends on the operating system and the device. On
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character framing, only 80% of the bits are available for data; for every eight bits of data, two more framing bits are sent.
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are DCE. If it is necessary to connect two DTE (or DCE) devices together, a cable with reversed TX and RX lines, known as a
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The configuration for serial ports designed to be connected to a PC has become a de facto standard, usually stated as
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to the more standard 9-pin DE-9 connector (and frequently mounted on a free slot plate or other part of the housing).
481:, usually the smaller 2.5 or 3.5 mm connectors and the most basic 3-wire interface—transmit, receive and ground. 2517: 3254: 2209: 1938:
Serial ports use two-level (binary) signaling, so the data rate in bits per second is equal to the symbol rate in
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which used the control lines to signal loss of power, low battery, and other status information. At least some
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so it can keep up averaged over a longer time, using delays after time-consuming operations (e.g. in
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connector has been used by most IBM-compatible PCs since the Serial/Parallel Adapter option for the
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Serial computer mice may draw their operating power from the received data or control signals.
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parity bit is added to the 7 data bits for a total of 8 bits between the start and stop bits.
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parity means that the parity bit is always set to the mark signal condition (1 bit value).
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Note that EIA/TIA 561 combines DSR and RI, and the Yost standard combines DSR and DCD.
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Serial Port Complete: COM Ports, USB Virtual COM Ports, and Ports for Embedded Systems
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and various types of virtual serial ports do not necessarily have names starting with
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A standard series of rates is based on multiples of the rates for electromechanical
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to control screen functions by external computer, other AV components or remotes
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parity always sends the parity bit in the space signal condition (0 bit value).
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The following table lists commonly used RS-232 signals and pin assignments:
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computers may use a serial port as a control console for diagnostics, while
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Conventionally, computers and terminals are DTE, while peripherals such as
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common on motherboards and add-in cards which is usually converted via a
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that breaks the card's DC-37 connector into four standard DE-9 connectors
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Most serial communications designs send the data bits within each byte
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means that the parity bit is set so that the number of 1 bits is even.
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means that the parity bit is set so that the number of 1 bits is odd.
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The parity bit in each character can be set to one of the following:
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Intel Server Board S5000PAL/S5000XAL Technical Product Specification
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to implement a serial port. This IC converts characters to and from
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means that no parity bit is sent and the transmission is shortened.
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Since the control signals for a serial port can be driven by any
3338: 3232: 2832:; 2nd Edition; Jan Axelson; Lakeview Research; 380 pages; 2007; 2776:"Courier 56K Business Modem: User Guide: Controlling Data Rates" 1983: 1962: 1939: 1872: 1845: 1817: 1750: 1716: 1226: 639: 621: 504: 492: 237: 2871: 2223: – Device that motivated serial port development 66:
through which information transfers in or out sequentially one
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are used, one-and-one half or two stop bits may be required.
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Communication interface transmitting information sequentially
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List of Bluetooth profiles § Serial Port Profile (SPP)
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standard defines a pinout using this connector, while the
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favor the related RS-422 standard, mostly using circular
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can quickly and easily add a serial port to a modern PC.
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The number of data bits in each character can be 5 (for
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operating systems usually label the serial port devices
2749:. Multi-Tech Systems, Inc. January 2019. Archived from 507:
computers and network devices, such as equipment from
2622:"AN519 Implementing a Simple Serial Mouse Controller" 74:, which communicates multiple bits simultaneously in 434:
appropriately gendered connectors on the cable or a
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serial card with a 25-pin connector (obsolete 8-bit
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A Cisco rollover cable using the 8P8C Yost standard
144:systems and some industrial and consumer products. 2229: – A software representation of a serial port 546:laptops had only one combined port to save space. 1384:Software debuggers that run on a second computer 337:A four-port serial (RS-232) PCI Express ×1 1389:microprocessor development or evaluation boards 495:connectors are also used in many devices. The 3416:History of computing hardware (1960s–present) 2883: 2597:"AN-681 PC Mouse Implementation Using COP800" 1352:Test and measuring equipment such as digital 8: 2673: 2671: 1211:is a common trademark-free abbreviation for 465:Some miniaturized electronics, particularly 3303: 2915: 2890: 2876: 2868: 2077:To allow detection of messages damaged by 1997:first; this was used, for example, by the 1993:first. Also possible, but rarely used, is 1452: 578: 247:Very low-cost systems, such as some early 51:computer along with the serial port symbol 2863:RS-232 and other serial port pinouts list 2391:"Cabling Guide for Console and AUX Ports" 552:connectors can be found on some devices. 220:Learn how and when to remove this message 2512: 2510: 2296:. Lantronix. 2006-03-29. Archived from 2239: 503:(or Yost standard) is commonly used on 291: 2249:"Serial Port Definition & Meaning" 1256:environments refer to serial ports as 422:Generally, serial port connectors are 2724:from the original on January 10, 2020 1900:, stage lighting and effects network 477:equipment, have serial ports using a 438:can be used to correct the mismatch. 7: 3421:List of pioneers in computer science 2518:"Yost Serial Device Wiring Standard" 1264:Common applications for serial ports 202:adding citations to reliable sources 70:at a time. This is in contrast to a 2786:from the original on August 4, 2017 2319:"IBM PC AT Serial/Parallel Adapter" 2176:) or omitted by design (such as in 396:data circuit-terminating equipment 325: ×1 card with one serial port 94:, and directly between computers. 25: 2557:"RS-232D EIA/TIA-561 RJ45 Pinout" 2451:. National Instruments. July 2013 1387:Console or debugger interface to 2850: 2627:. Microchip Technology Inc. 1997 2343:"TI-73...92+/V200 TI Link Guide" 2294:"RS232 - DTE and DCE connectors" 1978:), 6 (rarely used), 7 (for true 1284:Configuration and management of 1233:hardware serial ports are named 366: 361:compatible serial port hardware. 350: 330: 314: 294: 178: 2273:"Serial Cable Connection Guide" 2247:Beal, Vangie (September 1996). 1374:management and status reporting 189:needs additional citations for 125:or a related standard, such as 2712:"BACnet MS/TP Overview Manual" 2442:"Serial Quick Reference Guide" 555:Another common connector is a 1: 3411:History of computing hardware 1812:compression, low cost serial 80:history of personal computers 3279:Network interface controller 2689:. 2018-12-04. Archived from 2653:. 2018-04-22. 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1242: 1238: 1234: 1218: 1204: 1195: 980:Request To Send 670:(ALTPIN option) 625: 620: 574: 557: 556: 534:Many models of 518:Pair of female 479:phone connector 444: 420: 410:, roll-over or 384: 379: 378: 377: 374: 371: 362: 355: 346: 335: 326: 319: 310: 299: 259:pin, using the 226: 215: 209: 206: 195: 183: 172: 121:compliant with 28: 23: 22: 15: 12: 11: 5: 3470: 3468: 3460: 3459: 3454: 3449: 3444: 3434: 3433: 3427: 3426: 3424: 3423: 3418: 3413: 3407: 3405: 3401: 3400: 3397: 3396: 3394: 3393: 3388: 3383: 3378: 3373: 3368: 3363: 3358: 3351: 3349: 3345: 3344: 3342: 3341: 3336: 3331: 3326: 3321: 3316: 3310: 3308: 3301: 3295: 3294: 3292: 3291: 3289:Expansion card 3286: 3281: 3276: 3275: 3274: 3269: 3259: 3258: 3257: 3247: 3246: 3245: 3240: 3226: 3216: 3215: 3214: 3209: 3199: 3194: 3193: 3192: 3190:Microprocessor 3181: 3179: 3173: 3172: 3170: 3169: 3168: 3167: 3162: 3152: 3151: 3150: 3145: 3140: 3130: 3125: 3119: 3117: 3109: 3108: 3106: 3105: 3100: 3095: 3090: 3089: 3088: 3078: 3073: 3072: 3071: 3060: 3058: 3056:Output devices 3052: 3051: 3048: 3047: 3045: 3044: 3043: 3042: 3032: 3031: 3030: 3020: 3015: 3010: 3009: 3008: 2998: 2993: 2987: 2985: 2981: 2980: 2978: 2977: 2972: 2967: 2962: 2960:Pointing stick 2957: 2952: 2951: 2950: 2940: 2935: 2930: 2924: 2922: 2913: 2907: 2906: 2897: 2895: 2894: 2887: 2880: 2872: 2866: 2865: 2860: 2846: 2845:External links 2843: 2842: 2841: 2825: 2822: 2819: 2818: 2797: 2767: 2735: 2703: 2667: 2638: 2613: 2587: 2562: 2548: 2534: 2506: 2480: 2461: 2430: 2419:WhiteFiles.org 2406: 2382: 2358: 2334: 2331:on 2020-02-24. 2310: 2285: 2264: 2238: 2237: 2235: 2232: 2231: 2230: 2224: 2218: 2212: 2205: 2202: 2185:no handshaking 2108: 2105: 2099: 2096: 2086: 2083: 2064: 2063: 2057: 2051: 2045: 2039: 2010:Main article: 2007: 2004: 1971: 1968: 1935: 1932: 1915: 1914: 1912: 1909: 1906: 1902: 1901: 1895: 1892: 1889: 1885: 1884: 1862: 1859: 1856: 1852: 1851: 1840: 1837: 1834: 1830: 1829: 1803: 1800: 1797: 1793: 1792: 1786: 1783: 1780: 1776: 1775: 1765: 1762: 1759: 1755: 1754: 1744: 1741: 1738: 1734: 1733: 1731: 1728: 1725: 1721: 1720: 1714: 1711: 1708: 1704: 1703: 1697: 1694: 1691: 1687: 1686: 1680: 1677: 1674: 1670: 1669: 1663: 1660: 1657: 1653: 1652: 1650: 1647: 1644: 1640: 1639: 1633: 1630: 1627: 1623: 1622: 1616: 1613: 1610: 1606: 1605: 1603: 1600: 1597: 1593: 1592: 1578: 1575: 1572: 1568: 1567: 1565: 1562: 1559: 1555: 1554: 1547:Bell 103 modem 1544: 1541: 1538: 1534: 1533: 1531: 1528: 1525: 1521: 1520: 1514: 1511: 1508: 1504: 1503: 1501:Bell 101 modem 1498: 1495: 1492: 1488: 1487: 1485: 1482: 1479: 1475: 1474: 1471: 1465: 1462: 1450: 1447: 1431:digital signal 1426: 1425: 1422: 1408: 1399: 1394: 1391: 1385: 1382: 1375: 1369: 1364: 1357: 1350: 1344: 1338: 1328: 1318: 1304: 1302:load balancers 1282: 1275: 1265: 1262: 1194: 1191: 1171: 1170: 1167: 1164: 1161: 1158: 1155: 1152: 1149: 1146: 1143: 1140: 1137: 1134: 1131: 1128: 1124: 1123: 1120: 1117: 1114: 1111: 1108: 1105: 1102: 1099: 1096: 1093: 1090: 1087: 1084: 1081: 1077: 1076: 1073: 1070: 1067: 1064: 1061: 1058: 1055: 1052: 1049: 1046: 1043: 1040: 1037: 1034: 1031: 1027: 1026: 1023: 1020: 1017: 1014: 1011: 1008: 1005: 1002: 999: 996: 993: 990: 987: 984: 981: 977: 976: 973: 970: 967: 964: 961: 958: 955: 952: 949: 946: 943: 940: 937: 934: 933:Ring Indicator 930: 929: 926: 923: 920: 917: 914: 911: 908: 905: 902: 899: 896: 893: 890: 887: 886:Data Set Ready 883: 882: 879: 876: 873: 870: 867: 864: 861: 858: 855: 852: 849: 846: 843: 840: 837: 833: 832: 829: 826: 823: 820: 817: 814: 811: 808: 805: 802: 799: 796: 793: 790: 787: 783: 782: 779: 776: 773: 770: 767: 764: 761: 758: 755: 752: 749: 746: 743: 740: 737: 733: 732: 729: 726: 723: 720: 717: 714: 711: 708: 705: 702: 699: 696: 693: 690: 687: 683: 682: 679: 676: 671: 665: 662: 659: 656: 650: 649: 643: 637: 632: 618: 613: 608: 603: 600: 594: 590: 589: 588:Connector pin 586: 583: 573: 570: 501:rollover cable 469:and hand-held 443: 440: 436:gender changer 428:D-subminiature 419: 416: 383: 380: 376: 375: 372: 365: 363: 356: 349: 347: 339:expansion card 336: 329: 327: 320: 313: 311: 300: 293: 290: 289: 288: 249:home computers 228: 227: 186: 184: 177: 171: 168: 41:D-subminiature 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3469: 3458: 3455: 3453: 3450: 3448: 3445: 3443: 3440: 3439: 3437: 3422: 3419: 3417: 3414: 3412: 3409: 3408: 3406: 3402: 3392: 3389: 3387: 3384: 3382: 3379: 3377: 3374: 3372: 3369: 3367: 3364: 3362: 3361:Parallel port 3359: 3356: 3353: 3352: 3350: 3346: 3340: 3337: 3335: 3332: 3330: 3327: 3325: 3322: 3320: 3317: 3315: 3312: 3311: 3309: 3305: 3302: 3300: 3296: 3290: 3287: 3285: 3282: 3280: 3277: 3273: 3270: 3268: 3265: 3264: 3263: 3260: 3256: 3253: 3252: 3251: 3248: 3244: 3241: 3238: 3234: 3230: 3227: 3225: 3222: 3221: 3220: 3217: 3213: 3210: 3208: 3205: 3204: 3203: 3200: 3198: 3195: 3191: 3188: 3187: 3186: 3183: 3182: 3180: 3178: 3177:Computer case 3174: 3166: 3163: 3161: 3158: 3157: 3156: 3153: 3149: 3146: 3144: 3141: 3139: 3136: 3135: 3134: 3131: 3129: 3126: 3124: 3121: 3120: 3118: 3116: 3110: 3104: 3103:Graphics card 3101: 3099: 3096: 3094: 3091: 3087: 3084: 3083: 3082: 3079: 3077: 3074: 3070: 3067: 3066: 3065: 3062: 3061: 3059: 3057: 3053: 3041: 3038: 3037: 3036: 3033: 3029: 3026: 3025: 3024: 3021: 3019: 3016: 3014: 3011: 3007: 3004: 3003: 3002: 3001:Graphics card 2999: 2997: 2996:Image scanner 2994: 2992: 2989: 2988: 2986: 2982: 2976: 2973: 2971: 2968: 2966: 2963: 2961: 2958: 2956: 2953: 2949: 2946: 2945: 2944: 2941: 2939: 2936: 2934: 2931: 2929: 2926: 2925: 2923: 2921: 2917: 2914: 2912: 2911:Input devices 2908: 2904: 2901: 2893: 2888: 2886: 2881: 2879: 2874: 2873: 2870: 2864: 2861: 2858: 2853: 2849: 2848: 2844: 2839: 2835: 2831: 2828: 2827: 2823: 2814: 2807: 2801: 2798: 2790:September 26, 2785: 2781: 2777: 2771: 2768: 2760:September 26, 2752: 2745: 2739: 2736: 2728:September 26, 2720: 2717:. Neptronic. 2713: 2707: 2704: 2693:on 2019-09-28 2692: 2688: 2684: 2680: 2674: 2672: 2668: 2657:on 2019-09-28 2656: 2652: 2648: 2642: 2639: 2623: 2617: 2614: 2598: 2591: 2588: 2577: 2573: 2566: 2563: 2558: 2552: 2549: 2544: 2538: 2535: 2524:on 2020-06-17 2523: 2519: 2513: 2511: 2507: 2496:on 2010-08-11 2495: 2491: 2484: 2481: 2477:. p. 38. 2473: 2472: 2465: 2462: 2450: 2443: 2437: 2435: 2431: 2420: 2416: 2410: 2407: 2396: 2392: 2386: 2383: 2372: 2368: 2362: 2359: 2348: 2347:merthsoft.com 2344: 2338: 2335: 2327: 2320: 2314: 2311: 2300:on 2015-12-14 2299: 2295: 2289: 2286: 2274: 2268: 2265: 2254: 2250: 2243: 2240: 2233: 2228: 2225: 2222: 2219: 2216: 2213: 2211: 2208: 2207: 2203: 2201: 2199: 2195: 2191: 2186: 2181: 2179: 2175: 2171: 2165: 2163: 2158: 2156: 2151: 2146: 2142: 2138: 2134: 2131: 2127: 2125: 2121: 2117: 2113: 2106: 2104: 2097: 2095: 2093: 2084: 2082: 2080: 2075: 2073: 2067: 2061: 2058: 2055: 2052: 2049: 2046: 2043: 2040: 2037: 2034: 2033: 2032: 2029: 2027: 2023: 2018: 2013: 2005: 2003: 2000: 1996: 1992: 1987: 1985: 1981: 1977: 1969: 1967: 1964: 1959: 1956: 1952: 1947: 1945: 1941: 1933: 1931: 1929: 1924: 1921: 1913: 1910: 1907: 1904: 1903: 1899: 1896: 1893: 1890: 1887: 1886: 1882: 1878: 1874: 1870: 1866: 1863: 1860: 1857: 1854: 1853: 1850: 1847: 1844: 1841: 1838: 1835: 1832: 1831: 1827: 1823: 1819: 1815: 1811: 1807: 1804: 1801: 1798: 1795: 1794: 1790: 1787: 1784: 1781: 1778: 1777: 1773: 1769: 1766: 1763: 1760: 1757: 1756: 1752: 1748: 1745: 1742: 1739: 1736: 1735: 1732: 1729: 1726: 1723: 1722: 1718: 1715: 1712: 1709: 1706: 1705: 1701: 1698: 1695: 1692: 1689: 1688: 1684: 1681: 1678: 1675: 1672: 1671: 1667: 1664: 1661: 1658: 1655: 1654: 1651: 1648: 1645: 1642: 1641: 1637: 1634: 1631: 1628: 1625: 1624: 1620: 1617: 1614: 1611: 1608: 1607: 1604: 1601: 1598: 1595: 1594: 1590: 1586: 1582: 1579: 1576: 1573: 1570: 1569: 1566: 1563: 1560: 1557: 1556: 1552: 1548: 1545: 1542: 1539: 1536: 1535: 1532: 1529: 1526: 1523: 1522: 1518: 1515: 1512: 1509: 1506: 1505: 1502: 1499: 1496: 1493: 1490: 1489: 1486: 1483: 1480: 1477: 1476: 1472: 1469: 1466: 1463: 1461: 1458: 1457: 1448: 1446: 1443: 1440: 1436: 1432: 1423: 1416: 1412: 1409: 1407: 1403: 1400: 1398: 1395: 1392: 1390: 1386: 1383: 1380: 1376: 1373: 1370: 1368: 1365: 1362: 1358: 1355: 1351: 1348: 1345: 1342: 1339: 1337:text displays 1336: 1332: 1329: 1326: 1325:point of sale 1322: 1319: 1312: 1308: 1305: 1303: 1299: 1295: 1291: 1287: 1283: 1281: 1277: 1276: 1274: 1272: 1263: 1261: 1259: 1255: 1251: 1246: 1232: 1228: 1224: 1216: 1215: 1210: 1202: 1198: 1192: 1190: 1187: 1185: 1181: 1180:common return 1177: 1176:Signal Ground 1168: 1165: 1162: 1159: 1156: 1153: 1150: 1147: 1144: 1141: 1138: 1132: 1129: 1126: 1125: 1121: 1118: 1115: 1112: 1109: 1106: 1103: 1100: 1097: 1094: 1091: 1085: 1082: 1080:Signal Ground 1079: 1078: 1074: 1071: 1068: 1065: 1062: 1059: 1056: 1053: 1050: 1047: 1044: 1041: 1038: 1035: 1032: 1030:Clear To Send 1029: 1028: 1024: 1021: 1018: 1015: 1012: 1009: 1006: 1003: 1000: 997: 994: 991: 988: 985: 982: 979: 978: 974: 971: 968: 965: 962: 959: 956: 953: 950: 947: 944: 941: 938: 935: 932: 931: 927: 924: 921: 918: 915: 912: 906: 903: 900: 897: 894: 891: 888: 885: 884: 880: 877: 874: 871: 868: 865: 859: 856: 853: 850: 847: 844: 841: 838: 835: 834: 830: 827: 824: 821: 818: 815: 812: 809: 806: 803: 800: 797: 794: 791: 788: 785: 784: 780: 777: 774: 771: 768: 765: 762: 759: 756: 753: 750: 747: 744: 741: 738: 736:Received Data 735: 734: 730: 727: 724: 721: 718: 715: 712: 709: 706: 703: 700: 697: 694: 691: 688: 685: 684: 680: 677: 675: 672: 669: 666: 663: 660: 657: 655: 652: 651: 647: 641: 636: 629: 623: 617: 612: 607: 598: 591: 580: 577: 571: 569: 567: 563: 553: 551: 547: 545: 541: 537: 529: 525: 521: 516: 512: 510: 509:Cisco Systems 506: 502: 498: 494: 486: 482: 480: 476: 475:two-way radio 472: 468: 463: 461: 457: 453: 448: 441: 439: 437: 431: 429: 425: 417: 415: 413: 409: 405: 400: 398: 397: 392: 391: 381: 369: 364: 360: 353: 348: 344: 343:octopus cable 340: 333: 328: 324: 317: 312: 308: 304: 297: 292: 287: 285: 281: 277: 276:minicomputers 273: 269: 264: 262: 258: 254: 250: 245: 243: 239: 235: 224: 221: 213: 210:November 2021 203: 199: 193: 192: 187:This section 185: 181: 176: 175: 169: 167: 165: 161: 157: 153: 149: 145: 143: 142:point of sale 139: 134: 132: 128: 124: 120: 116: 112: 108: 104: 100: 95: 93: 89: 85: 81: 77: 73: 72:parallel port 69: 65: 62: 58: 50: 46: 42: 39: 34: 30: 19: 3457:Serial buses 3365: 3267:Power MOSFET 3250:Power supply 3219:Data storage 3155:Flash memory 3133:Optical disc 3115:data storage 2829: 2800: 2788:. Retrieved 2770: 2758:. Retrieved 2751:the original 2738: 2726:. Retrieved 2706: 2695:. Retrieved 2691:the original 2682: 2659:. Retrieved 2655:the original 2641: 2629:. Retrieved 2616: 2604:. Retrieved 2590: 2579:. Retrieved 2575: 2565: 2551: 2537: 2526:. Retrieved 2522:the original 2498:. Retrieved 2494:the original 2483: 2470: 2464: 2453:. Retrieved 2448: 2422:. Retrieved 2418: 2409: 2398:. Retrieved 2394: 2385: 2374:. Retrieved 2370: 2361: 2350:. Retrieved 2346: 2337: 2326:the original 2313: 2302:. Retrieved 2298:the original 2288: 2277:. Retrieved 2267: 2256:. Retrieved 2252: 2242: 2184: 2182: 2166: 2159: 2149: 2136: 2135: 2129: 2128: 2123: 2119: 2112:Flow control 2110: 2107:Flow control 2101: 2092:teleprinters 2088: 2076: 2071: 2068: 2065: 2059: 2053: 2047: 2041: 2035: 2030: 2016: 2015: 1988: 1973: 1960: 1951:teleprinters 1948: 1937: 1925: 1922: 1918: 1883:compression 1828:compression 1774:compression 1444: 1428: 1424:Serial mouse 1419:230.4 kbit/s 1267: 1247: 1239:/dev/ttyUSB* 1212: 1208: 1199: 1196: 1188: 1183: 1175: 1174: 602:Abbreviation 575: 566:ribbon cable 554: 548: 533: 528:Macintosh LC 491: 464: 449: 445: 432: 421: 401: 394: 388: 385: 265: 246: 231: 216: 207: 196:Please help 191:verification 188: 146: 135: 114: 96: 56: 54: 29: 3366:Serial port 3357:(IEEE 1394) 3334:DisplayPort 3324:Thunderbolt 3197:Motherboard 3160:Memory card 3128:Floppy disk 2970:Touchscreen 2857:Serial port 2221:Teleprinter 2116:handshaking 1976:Baudot code 1875:modem with 1820:modem with 1808:modem with 1770:modem with 1413:(Macintosh 1354:multimeters 1315:4,800 bit/s 654:EIA/TIA-561 497:EIA/TIA-561 382:DTE and DCE 323:PCI Express 261:bit banging 115:serial port 113:, the term 92:peripherals 57:serial port 3436:Categories 3113:Removable 3098:Sound card 3028:Sound chip 3023:Sound card 3013:Microphone 2903:components 2780:USRobotics 2697:2019-09-28 2661:2019-09-28 2581:2021-09-30 2528:2020-05-10 2500:2010-07-07 2455:2021-06-18 2424:2020-08-14 2400:2020-08-14 2376:2020-08-14 2371:Miklor.com 2352:2020-08-14 2304:2016-01-31 2279:2016-01-31 2258:2021-03-08 2234:References 2079:line noise 2012:Parity bit 1928:9600/8-N-1 1439:Morse code 1411:Networking 1323:and other 1286:networking 1235:/dev/ttyS* 1231:16550 UART 661:Yost (DCE) 658:Yost (DTE) 562:pin header 520:Mini DIN-8 450:The 9-pin 442:Connectors 412:null modem 408:cross-over 393:(DTE) and 272:mainframes 90:, various 3376:PS/2 port 3371:Game port 3284:Fax modem 3123:Disk pack 2975:Trackball 2938:Light pen 2687:Microsoft 2651:Microsoft 2576:Techwalla 2253:Webopedia 2162:stateless 2085:Stop bits 2060:Space (S) 1970:Data bits 1865:LocalTalk 1585:Bell 212A 1519:terminal 1415:AppleTalk 1379:Stenotype 1359:Updating 1311:NMEA 0183 1298:firewalls 1205:/dev/tty* 1201:Unix-like 648:("RJ50") 585:Direction 544:PowerBook 536:Macintosh 280:Super I/O 236:called a 154:(such as 88:terminals 64:interface 3355:FireWire 3348:Obsolete 3314:Ethernet 3093:Speakers 2991:Keyboard 2965:Touchpad 2900:computer 2784:Archived 2782:. 2007. 2719:Archived 2204:See also 2145:XON/XOFF 2124:software 2120:hardware 2054:Mark (M) 2048:Even (E) 2036:None (N) 1999:IBM 2741 1581:Bell 202 1517:IBM 2741 1449:Settings 1406:teletype 1397:Printers 1381:machines 1361:firmware 1294:switches 1278:Dial-up 1214:teletype 678:Cyclades 664:Cyclades 642:("RJ45") 530:computer 424:gendered 341:with an 170:Hardware 160:switches 119:hardware 103:FireWire 99:Ethernet 76:parallel 3404:Related 3307:Current 3148:Blu-ray 3086:Plotter 3081:Printer 3064:Monitor 3040:Softcam 2948:Optical 2813:Semtech 2631:29 July 2606:29 July 2194:termcap 2190:buffers 2170:escaped 2042:Odd (O) 1905:256,000 1888:250,000 1877:V.42bis 1855:230,400 1833:128,000 1822:V.42bis 1810:V.42bis 1796:115,200 1772:V.42bis 1768:V.32bis 1702:serial 1683:V.32bis 1636:V.27ter 1619:V.22bis 1481:13333.3 1468:Windows 1327:devices 1290:routers 1254:Windows 628:TIA-574 599:circuit 572:Pinouts 471:amateur 460:TIA-574 284:chipset 266:Before 156:routers 3262:MOSFET 3202:Memory 3069:Screen 3035:Webcam 2898:Basic 2836:  2449:NI.com 2017:Parity 2006:Parity 1898:DMX512 1789:BACnet 1779:76,800 1758:57,600 1753:modem 1737:56,000 1724:38,400 1707:31,250 1700:Modbus 1690:19,200 1685:modem 1673:14,400 1668:modem 1638:modem 1621:modem 1591:modem 1561:1666.7 1553:modem 1540:3333.3 1527:6666.6 1510:7434.9 1494:9090.9 1280:modems 1136:Common 1089:Common 646:10P10C 582:Signal 558:10 × 2 550:10P10C 524:RS-422 418:Gender 404:modems 359:IBM XT 303:IBM PC 257:output 148:Server 131:RS-422 127:RS-485 123:RS-232 111:stream 105:, and 84:modems 45:RS-232 3381:eSATA 3299:Ports 2984:Other 2943:Mouse 2809:(PDF) 2754:(PDF) 2747:(PDF) 2722:(PDF) 2715:(PDF) 2625:(PDF) 2600:(PDF) 2475:(PDF) 2445:(PDF) 2395:Cisco 2329:(PDF) 2322:(PDF) 2141:ASCII 1980:ASCII 1944:8-N-1 1934:Speed 1719:port 1659:104.2 1656:9,600 1646:138.9 1643:7,200 1629:208.3 1626:4,800 1612:416.7 1609:2,400 1599:555.6 1596:1,800 1587:, or 1574:833.3 1571:1,200 1507:134.5 1223:Linux 1178:is a 789:108/2 681:Digi 616:DB-25 456:PC-AT 309:card) 59:is a 3339:HDMI 3255:SMPS 3243:SSHD 3237:NVMe 3233:SATA 3212:BIOS 2834:ISBN 2792:2019 2762:2019 2730:2019 2633:2023 2608:2023 2122:and 2072:none 1984:byte 1963:MIDI 1940:baud 1908:3.91 1881:V.44 1873:V.92 1869:V.90 1858:4.34 1846:ISDN 1836:7.81 1826:V.44 1818:V.92 1814:V.90 1806:V.34 1799:8.68 1782:13.0 1761:17.4 1751:V.92 1747:V.90 1740:17.9 1727:26.0 1717:MIDI 1693:52.1 1676:69.4 1666:V.32 1589:V.22 1551:V.21 1333:and 1252:and 1248:The 1227:8250 1107:4, 5 1104:4, 5 1098:3, 4 1036:CTS 986:RTS 892:DSR 842:DCD 792:DTR 742:RxD 692:TxD 668:Digi 640:8P8C 622:DE-9 597:V.24 593:Name 505:Unix 493:8P8C 473:and 452:DE-9 274:and 238:UART 158:and 38:male 3391:VGA 3386:DVI 3319:USB 3272:VRM 3229:SSD 3224:HDD 3207:RAM 3143:DVD 3006:GPU 2200:). 2198:TCP 2183:If 2180:). 1911:Yes 1891:4.0 1879:or 1839:Yes 1824:or 1802:Yes 1764:Yes 1743:Yes 1730:Yes 1696:Yes 1679:Yes 1662:Yes 1649:Yes 1632:Yes 1615:Yes 1602:Yes 1577:Yes 1564:Yes 1558:600 1549:or 1543:Yes 1537:300 1530:Yes 1524:150 1513:Yes 1497:Yes 1491:110 1484:Yes 1335:LCD 1331:LED 1313:at 1307:GPS 1258:COM 1250:DOS 1243:tty 1209:TTY 1133:PG 1130:101 1083:102 1042:Out 1033:106 989:Out 983:105 945:Out 939:RI 936:125 898:Out 889:107 881:10 848:Out 839:109 795:Out 748:Out 739:104 695:Out 689:103 635:MMJ 611:DCE 606:DTE 307:ISA 301:An 253:CPU 200:by 129:or 107:USB 68:bit 3438:: 3235:/ 3138:CD 2811:. 2778:. 2685:. 2681:. 2670:^ 2649:. 2574:. 2509:^ 2447:. 2433:^ 2417:. 2393:. 2369:. 2345:. 2251:. 1930:. 1894:No 1861:No 1785:No 1713:No 1710:32 1583:, 1478:75 1404:, 1300:, 1296:, 1292:, 1245:. 1225:, 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710:6 707:2 704:3 701:2 630:) 626:( 223:) 217:( 212:) 208:( 194:. 20:)

Index

Serial interface

male
D-subminiature
RS-232
IBM PC compatible
serial communication
interface
bit
parallel port
parallel
history of personal computers
modems
terminals
peripherals
Ethernet
FireWire
USB
stream
hardware
RS-232
RS-485
RS-422
personal computers
point of sale
Server
networking hardware
routers
switches
USB-to-serial converters

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