Chapter Three Serial Communications Unit 9 a part 1 Notes to Text L Part4 Extensive Reading Part 2 Word Study Part5 Notes to Passage Part3 Practice on Text Part6 Practice on Passage 2021/2/20 P1
2021/2/20 P.1 Unit 9 Serial Communications Chapter Three @ Part 1 Notes to Text & Part4 Extensive Reading & Part 2 Word Study @ Part5 Notes to Passage @ Part3 Practice on Text @ Part6 Practice on Passage
a Part 1 Notes to text Serial Communications 1) serial communications串口通讯 简介:串口通讯是指在一个时间内传输一位数字数据。从19世纪的 二进位电报编码,发展到现在的RS232(EA-232),主要用于连 接终端和大型主机。串口通讯在过去的40年里,大大推动了通 讯技术的发展。本文主要阐述了关于串口通讯的串口按位(bit) 发送和接收字节的基本概念。 2)On the other hand, when communicating with a timesharing system over a modem, only a single channel is available and bit-serial transmission is required.另一方面,如果通过 调制解调器与分时系统进行通讯,就只有一条通道可行,此时就 需要用到位串行传输了。 注释:该句是并列句。现在分词短语 when communicating with 作时间状语。 2021/2/20 P2
2021/2/20 P.2 @ Part 1 Notes to Text 1)serial communications 串口通讯 简介：串口通讯是指在一个时间内传输一位数字数据。从19世纪的 二进位电报编码，发展到现在的RS-232(EIA-232)，主要用于连 接终端和大型主机。串口通讯在过去的40年里，大大推动了通 讯技术的发展。本文主要阐述了关于串口通讯的串口按位（bit） 发送和接收字节的基本概念。 2) On the other hand, when communicating with a timesharing system over a modem, only a single channel is available, and bit-serial transmission is required. 另一方面，如果通过 调制解调器与分时系统进行通讯，就只有一条通道可行，此时就 需要用到位串行传输了。 注释：该句是并列句。现在分词短语when communicating with… 作时间状语。 Serial Communications
3) The popular Centronics printer interface is a case where byte- serial transmission is used.广为流行的并行打印机接口就是一个使 用字节串行传输的例子。 简介: Centronics,称并口,也有称之为EEE1284,是目前外部设备 与电脑连接常见的接口类型之一,另外还有其他接口类型包括:串口 (也有称之为RS-232接口的)和UsB接口。 4)If two electrical transitions were required for each bit, as is the case in non-return-to-zero coding, then at a rate of 9600 baud,only4800 bits per second could be conveyed.如果每位数 需要经过两次电子转换,就象非归零编码时所需要的那样,那么以 9600波特速度,每秒就只能传送4800位。 注释: If two electrical transitions were.是虚拟条件从句,表示对 某种情况的假设;习惯用语 as is the case in…,意思是“这与…的 情况一样”,在整句中作插入语,补充说明前文 two electrical transitions were required for each bit 2021/2/20 P3
2021/2/20 P.3 3) The popular Centronics printer interface is a case where byteserial transmission is used. 广为流行的并行打印机接口就是一个使 用字节串行传输的例子。 简介： Cenronics,称并口，也有称之为IEEE1284，是目前外部设备 与电脑连接常见的接口类型之一，另外还有其他接口类型包括：串口 （也有称之为RS-232接口的）和USB接口。 4) If two electrical transitions were required for each bit, as is the case in non-return-to-zero coding, then at a rate of 9600 baud, only 4800 bits per second could be conveyed. 如果每位数 需要经过两次电子转换，就象非归零编码时所需要的那样，那么以 9600波特速度，每秒就只能传送4800位。 注释： If two electrical transitions were …是虚拟条件从句,表示对 某种情况的假设; 习惯用语as is the case in…，意思是“这与……的 情况一样”，在整句中作插入语，补充说明前文two electrical transitions were required for each bit
5)It does not include framing, formatting, and error detecting bits that may be added to the information bits before a message is transmitted, and will always be less than one 它不包括位的构成,位的格式化以及位的错误检测,这些位会在信息 传送前增加至信息位上,且永远也不会超过一个位。 注释 hat may be.less than one引导的是定语从句修饰前面的 framing, formatting, and error detecting bits; FRaming formatting and error detecting均为名词bs的修饰语 2021/2/20 P4 End
2021/2/20 P.4 5) It does not include framing, formatting, and error detecting bits that may be added to the information bits before a message is transmitted, and will always be less than one. 它不包括位的构成，位的格式化以及位的错误检测，这些位会在信息 传送前增加至信息位上，且永远也不会超过一个位。 注释:that may be…less than one引导的是定语从句,修饰前面的 framing, formatting, and error detecting bits；注意framing, formatting and error detecting 均为名词bits的修饰语。 End
L Part 2 Word Study 1 simultaneously adv. 同时地 11 timesharing adj.分时的 2. sequentially ad.有序地,依次地12. baud rate n.波特率 3.bit- serial adj.位串行的 13. correspond to相当于,相似于 4. reassemble v重新组合 14. efficiency n.效率 5. compose v编写 15. detect v.检测,探测 6 peripheral n.外围设备,外挂设备16. erroneously adv..错误地 7. feasible adj.可行的,可能的 17. bandwidth n.带宽,频带宽度 8 interface n.接口,界面 18. protocol n.协议 9 microprocessor n.微处理器 19. immunity n.免疫性 10. equivalent n.对应物,相应的事物
2021/2/20 P.5 End 1. simultaneously adv. 同时地 11. timesharing adj. 分时的 2. sequentially adv. 有序地，依次地 12. baud rate n. 波特率 3. bit-serial adj. 位串行的 13. correspond to 相当于，相似于 4. reassemble v 重新组合 14. efficiency n. 效率 5. compose v 编写 15. detect v. 检测，探测 6. peripheral n. 外围设备，外挂设备 16. erroneously adv. 错误地 7. feasible adj. 可行的，可能的 17. bandwidth n. 带宽，频带宽度 8. interface n. 接口，界面 18. protocol n. 协议 9. microprocessor n. 微处理器 19. immunity n. 免疫性 10. equivalent n. 对应物，相应的事物 & Part 2 Word Study
Part3 Practice on Text Task 1: Listening training Dictation of some key words Directions: You will hear some key words twice, most of which are taken from the Word Study. Then finish the Crossword Puzzle. ( See you book p. 2. Dictation of some key expressions Directions: You will hear some key expressions twice, most of which are taken from this text. Then you are asked to complete the missing words 1)most messages4)serial interface standard 2)serial transmission 5) error detecting bits 3)through eight parallel channels. 6)an agreed-upon_convention 2021/2/20 P.6
2021/2/20 P.6 Task 1: Listening training Dictation of some key words Directions: You will hear some key words twice, most of which are taken from the Word Study. Then finish the Crossword Puzzle. (See you book p. ) 2. Dictation of some key expressions Directions: You will hear some key expressions twice, most of which are taken from this text. Then you are asked to complete the missing words. @ Part3 Practice on Text 1) most ____________messages 2) serial__________________ 3) through eight_______________ 4) ________interface__________ 5) __________detecting________ 6) an ______________convention digital transmission parallel channels serial standard error bits agreed-upon
Task 2. Read. Write and Translate Read and Reply Directions: Students are required to read aloud the whole text after the teacher. Then give short answers to the following questions a) How does bit-serial transmission transfer a message? Bit-serial transmission conveys a message one bit at a time through a channel. Each bit represents a part of the message The individual bits are then reassembled at the destination to com pose the message. b)Why is the transfer rate of byte-serial transmission eight times higher than that of bit-serial transmission? Byte-serial transmission conveys eight bits at a time through eight parallel channels. Eight channels are needed; the cost thus may be as much as eight times higher to transmitthe message. c)What does a communications protocol refer to? A communications protocol is an agreed-upon convention that defines the order and meaning of bits in a serial transmission. It may also specify a procedure for exchanging messages 2021/2/20 P7
2021/2/20 P.7 Read and Reply Directions:Students are required to read aloud the whole text after the teacher. Then give short answers to the following questions: a) How does bit-serial transmission transfer a message? b) Why is the transfer rate of byte-serial transmission eight times higher than that of bit-serial transmission? Task 2: Read, Write and Translate Bit-serial transmission conveys a message one bit at a time through a channel. Each bit represents a part of the message. The individual bits are then reassembled at the destination to compose the message. Byte-serial transmission conveys eight bits at a time through eight parallel channels. Eight channels are needed; the cost thus may be as much as eight times higher to transmit the message. A communications protocol is an agreed-upon convention that defines the order and meaning of bits in a serial transmission. It may also specify a procedure for exchanging messages. c) What does a communications protocol refer to ?
Read and Judge (T)1 Bit-serial transmission converys a message one bit at a time through a channel. (72) It is economic to use parallel channel while a short- distance transmission is made (F)3)Bit rate is atucally the same as baud rate (F)4)Generally speaking, the maximum data rate is directly proportional to channel s noise level, and inversely proportional to the channel s bandwidth (T)5 Channel efficiency is determined by the protocol design. G20212120P8G End 1
2021/2/20 P.8 ( ) 1) Bit-serial transmission converys a message one bit at a time through a channel. ( ) 2) It is economic to use parallel channel while a shortdistance transmission is made. ( ) 3) Bit rate is atucally the same as baud rate . ( ) 4) Generally speaking,the maximum data rate is directly proportional to channel’s noise level,and inversely proportional to the channel’s bandwidth. ( ) 5) Channel efficiency is determined by the protocol design. Read and Judge End T T F F T
Read and Complete Directions: Read the following short passage. Complete it by filling in the missing words A sequential B. publication C. applied in D. discrete E refers to F refer to G installments H apply to I. irregular J single The term"serial"1)E the intrinsic property of a series- namely its order. In literature, the term is used as a noun to 2)F a format by which a story is told in contiguous 3)G in sequential issues of a 4) periodica 5)1 More generally, "serial"is 6) C. library and information science to materials in any medium issued under the same title in a succession of 7) D parts, usually numbered (or dated) and appearing at regular or 8) intervals with no predetermined conclusion. "By extension, "serial "also came to 9)H a film issued in the same installment manner over a period of 10) weeks at a single movie house 2021/2/20 .9y End
2021/2/20 P.9 Directions:Read the following short passage. Complete it by filling in the missing words. A. sequential B. publication C. applied in D. discrete E. refers to F. refer to G. installments H. apply to I. irregular J. single The term "serial" 1)________ the intrinsic property of a series — namely its order. In literature, the term is used as a noun to 2)________ a format by which a story is told in contiguous 3)________ in sequential issues of a 4)________ periodica 5)__________. More generally, "serial" is 6)________ library and information science to materials "in any medium issued under the same title in a succession of 7)________parts, usually numbered (or dated) and appearing at regular or 8)________intervals with no predetermined conclusion." By extension, "serial" also came to 9)________ a film issued in the same installment manner over a period of 10)__________weeks at a single movie house. Read and Complete End E F G J B C D I H A
Read and Translate Directions: Put the following sentences into English, using the words or phrases given 1)上课时,老师把我们这个大班分成若干个小组。( break Our large class is broken into small groups by teacher during class 2)昨天晚上,技术故障导致电视节目播送中断。( transmis Last night, a technical fault led to a break in transmission 3)这台电脑主机是学生自己重新安装的。( reassem ble) The computer was reassembled by students themselves 4)他在支票上的签名和护照上的不一致。( correspond to His signature on the check doesn't correspond to the one in his passport. 5)我们的免疫系统让我们防止感染。( immunity) Emotional and environmental stresses can weaken the body's immunity 202120P10 End
2021/2/20 P.10 Read and Translate Directions:Put the following sentences into English, using the words or phrases given. End Our large class is broken into small groupsby teacher during class. Last night, a technical fault led to a break in transmission. The computer was reassembled by students themselves. His signature on the check doesn't correspond to the one in his passport. Emotional and environmental stresses can weaken the body's immunity. 1)上课时，老师把我们这个大班分成若干个小组。（break into 2)昨天晚上，技术故障导致电视节目播送中断。(transmission) 3)这台电脑主机是学生自己重新安装的。(reassemble) 4)他在支票上的签名和护照上的不一致。(correspond to ) 5)我们的免疫系统让我们防止感染。(immunity)