11 Alphanumeric Codes The ASCII Code American Standard Code for Information Interchange ASCII 7bit code used for representing alphanumeric symbols with a distinctive code word Developed for purpose of coding binary data ID: 207066
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Computer Communication and the Internet
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Alphanumeric CodesThe ASCII CodeAmerican Standard Code for Information Interchange (ASCII)7-bit code used for representing alphanumeric symbols with a distinctive code word.Developed for purpose of coding binary data.ASCII-7Adopted international standard.Slide3
Figure 11-1 American Standard Code for Information Interchange (ASCII).Slide4
Alphanumeric CodesThe EBCDIC CodeExtended Binary-Coded Decimal Interchange Code (EBCDIC)8-bit alphanumeric code.Slide5
Figure 11-2 The Extended Binary-Coded Decimal Interchange Code.Slide6
Table 11-1 The EBCDIC Code—List of AbbreviationsSlide7
Alphanumeric CodesThe Baudot CodeAlphanumeric code based on five binary values.Slide8
Figure 11-3 The Baudot code.Slide9
Figure 11-4 Baudot code examples.Slide10
Alphanumeric CodesThe Gray CodeNumeric code representing decimal values 0 to 9. Based on relationship that only one bit in a binary word changes for each binary step.Slide11
Figure 11-5 The Gray code.Slide12
Computer CommunicationAsynchronous systemTransmit and receive clocks free-run at approximately same speed.Synchronous systemBoth sender and receiver exactly synchronized to same clock frequency.Slide13
Computer CommunicationUniversal Serial Bus (USB) PortUniversal high-speed serial communications interface. See Table 11-2: The USB Wire Colors and FunctionsSlide14
Table 11-2 The USB Wire Colors and FunctionsSlide15
Figure 11-6 The USB Type A and Type B connectors.Slide16
Figure 11-7 An example of using the MAX3451 transceiver for establishing a USB connection.Slide17
Computer CommunicationIEEE 1394High-speed serial connection for computers and peripherals; developed by Apple (FireWire).Slide18
Figure 11-8 The IEEE 1394 connector and pin assignments.Slide19
Computer CommunicationRS-232 StandardOlder serial data communications follows standard (RS-232 C).Means of interfacing computer with modem.Defined signal levels and different lines used.Slide20
Figure 11-9 DB-25 connector.Slide21
Figure 11-11 Signal description for DB-25.Slide22
Computer CommunicationRS-232 Line DescriptionsGround pinsData signal pinsHandshaking pinsEquipment ready pinsSlide23
Figure 11-10 DB-9 connector.Slide24
Computer CommunicationRS-232 Line DescriptionsSignal detect pinRing indicator pinOther pinsSee Table 11-3: Overview of Current Serial Computer Communication StandardsSlide25
Table 11-3 Overview of Current Serial Computer Communication StandardsSlide26
Figure 11-12 The RS-232 null modem connection.Slide27
Computer CommunicationRS-422, RS-485Uses differential technique that provides significant improvement in performance and greater distances and capacity to support higher data rates.Supports multidrop applications.See Table 11-4: Standard Computer Bus InterfacesSlide28
Table 11-4 Standard Computer Bus InterfacesSlide29
Table 11-4 (continued) Standard Computer Bus Interfaces