table 4-1 baudot codehab/ch04.pdffigure 4-22a rs-232 logic levels and noise margin: (a) driver and...

TABLE 4-1 Baudot Code

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Advanced Electronic Communications

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Copyright ©2004 by Pearson Educat ion, Inc.

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TABLE 4-2 ASCII-77: Odd Parity

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TABLE 4-2 (Continued)

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TABLE 4-3 EBCDIC Code

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FIGURE 4-1 Typical bar code

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TABLE 4-4 Code 39 Character Set

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FIGURE 4-2 Code 39 bar code

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FIGURE 4-3A (a) UPC version A character set; (b) UPC label format; (c) left- and right-hand bit sequence for the digit 4

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FIGURE 4-3B (a) UPC version A character set; (b) UPC label format; (c) left- and right-hand bit sequence for the digit 4

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FIGURE 4-3C (a) UPC version A character set; (b) UPC label format; (c) left- and right-hand bit sequence for the digit 4

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TABLE 4-5 UPC Number System Characters

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FIGURE 4-4 UPC character 0

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FIGURE 4-5 CRC-16 generating circuit

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FIGURE 4-6 Data unit comprised of m character bits and n Hamming bits

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FIGURE 4-7 Asynchronous data format

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FIGURE 4-8A Telephone communications network: (a) human communications; (b) digital data communications

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FIGURE 4-8B Telephone communications network: (a) human communications; (b) digital data communications

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FIGURE 4-9A Two point data communications circuit: (a) DTE/DCE representation; (b) device representation

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FIGURE 4-9B Two point data communications circuit: (a) DTE/DCE representation; (b) device representation

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FIGURE 4-10 Multipoint data communications circuit using POTS links

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FIGURE 4-11 Line control unit UART interface

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FIGURE 4-12 UART transmitter block diagram

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TABLE 4-6 UART Control Register Inputs

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FIGURE 4-13A Asynchronous characters: (a) ASCII character; (b) ARQ character; (c) Baudot character

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FIGURE 4-13B Asynchronous characters: (a) ASCII character; (b) ARQ character; (c) Baudot character

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FIGURE 4-13C Asynchronous characters: (a) ASCII character; (b) ARQ character; (c) Baudot character

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FIGURE 4-14 UART transmitter signal sequence

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FIGURE 4-15 UART receiver block diagram

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FIGURE 4-16 UART receive signal sequence

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FIGURE 4-17A Start bit verification: (a) 1X RCP; (b) 16X RCP; (c) valid start bit

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FIGURE 4-17B Start bit verification: (a) 1X RCP; (b) 16X RCP; (c) valid start bit

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FIGURE 4-17C Start bit verification: (a) 1X RCP; (b) 16X RCP; (c) valid start bit

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FIGURE 4-18 16X receive clock rate

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FIGURE 4-19A Sampling error: (a) 8X RCP; (b) 16X RCP

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FIGURE 4-19B Sampling error: (a) 8X RCP; (b) 16X RCP

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FIGURE 4-20 RS-232 serial interface connector: (a) DB25P; (b) DB25S; (c) DB9P; (d) DB9S

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FIGURE 4-21 EIA-561 modular connector

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TABLE 4-7 RS-232 Voltage Specifications

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FIGURE 4-22A RS-232 logic levels and noise margin: (a) driver and terminator voltage ranges; (b) noise margin with a +10V high and -10V low; (c) noise violation

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FIGURE 4-22B RS-232 logic levels and noise margin: (a) driver and terminator voltage ranges; (b) noise margin with a +10V high and -10V low; (c) noise violation

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FIGURE 4-22C RS-232 logic levels and noise margin: (a) driver and terminator voltage ranges; (b) noise margin with a +10V high and -10V low; (c) noise violation

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FIGURE 4-23 RS-232 Electrical specifications

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TABLE 4-8 EIA RS-232 Pin Designations and Direction of Propagation

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TABLE 4-9 EIA RS-232 Pin Designations and Designations

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FIGURE 4-24 RS-232 data timing diagram - ASCII upper case letter A, 1 start bit, even parity, and one stop bit

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FIGURE 4-25A Functional block diagram for the drivers and terminators necessary for transmission of asynchronous data over the RS-232 interface between a DTE and a DCE (modem): (a) transmit circuits; (b) receive circuits

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FIGURE 4-25B Functional block diagram for the drivers and terminators necessary for transmission of asynchronous data over the RS-232 interface between a DTE and a DCE (modem): (a) transmit circuits; (b) receive circuits

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FIGURE 4-26A Typical timing diagram for control and data signals for asynchronous data transmission over the RS-232 interface between a DTE and a DCE (modem): (a) transmit timing diagram; (b) receive timing diagram

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FIGURE 4-26B Typical timing diagram for control and data signals for asynchronous data transmission over the RS-232 interface between a DTE and a DCE (modem): (a) transmit timing diagram; (b) receive timing diagram

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TABLE 4-10a RS-449 Pin Designations (37-Pin Connector)

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TABLE 4-10b RS-449 Pin Designations (Nine-Pin Connector)

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TABLE 4-11 RS-449 Category I and Category II Circuits

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TABLE 4-12 RS-530 Pin Designations

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FIGURE 4-27 Data communications modems - POTS analog channel

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FIGURE 4-28 Simplified block diagram for an asynchronous FSK modem

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TABLE 4-13 Bell System Modem Specifications

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TABLE 4-14 ITU-T V-Series Modem Standards

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FIGURE 4-29 V.32 constellation diagram using Trellis encoding

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FIGURE 4-30 V.33 signal constellation diagram using Trellis encoding

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table 4-1 baudot codehab/ch04.pdffigure 4-22a rs-232 logic levels and noise margin: (a) driver and...

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