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