1 00:00:01,960 --> 00:00:04,600 What is the art protocol, this lecture? 2 00:00:04,750 --> 00:00:05,830 We answer this question. 3 00:00:08,690 --> 00:00:15,740 Universal asynchronous receiver transmitter, you art is a surreal communication between two digital 4 00:00:15,740 --> 00:00:24,220 systems, each digital system contains two signals implementing the new art communication text transmitter 5 00:00:24,230 --> 00:00:26,930 port and asks receiver port. 6 00:00:28,350 --> 00:00:33,010 There is no shared clock between two parts to synchronize the Sario communication. 7 00:00:33,900 --> 00:00:36,450 Therefore, it is called asynchronous. 8 00:00:39,090 --> 00:00:46,110 Different types of devices can use this interface and the related protocols to communicate in this section, 9 00:00:46,260 --> 00:00:51,540 we are going to establish such communication between the bases three board and a computer. 10 00:00:54,840 --> 00:01:01,260 The sender and receiver communicating via you art should follow the same characteristics to exchange 11 00:01:01,260 --> 00:01:02,250 data successfully. 12 00:01:02,880 --> 00:01:11,040 From the digital point of view, these characteristics can be categorized into three groups, one transmission 13 00:01:11,040 --> 00:01:17,820 type that can be simplex, half duplex and full duplex, two data format. 14 00:01:18,030 --> 00:01:25,680 The data and their companion bits should have a specific format agreed by both transmitter and receiver. 15 00:01:25,680 --> 00:01:30,540 Three timing bits should be transferred at a predefined rate. 16 00:01:35,240 --> 00:01:41,570 In the simplest type, only one device is the sender and the other one is the receiver. 17 00:01:43,170 --> 00:01:49,410 In half duplex, both can send data, but there is one sender and receiver at each time. 18 00:01:51,220 --> 00:01:56,140 In full duplex, both devices can send and receive data at the same time. 19 00:01:59,690 --> 00:02:07,370 The data transmitted over your art is in the form of packets or frames, each packet of data has at 20 00:02:07,370 --> 00:02:14,490 most four parts, one to start with, whose value is zero seven or eight data. 21 00:02:14,540 --> 00:02:19,400 It's optional parity bit, which can be art or even parity. 22 00:02:19,940 --> 00:02:23,150 One or two subjects whose values are one. 23 00:02:24,400 --> 00:02:30,700 A data packet can have one to start with a database and want to stop it in a simple case. 24 00:02:35,490 --> 00:02:43,890 Let's assume we are going to send the zero one zero zero zero zero zero one or yacked the transmission 25 00:02:44,100 --> 00:02:51,330 data line that starts with a low level start and then a database and finally a high level. 26 00:02:51,330 --> 00:02:51,960 Stop it. 27 00:02:53,280 --> 00:03:00,030 If you want to consider an even parody, it that it should be sent after eight data and before they 28 00:03:00,030 --> 00:03:00,600 stop it. 29 00:03:04,470 --> 00:03:10,640 Although you art is an asynchronous protocol, the transmitter and receiver should have a predefined 30 00:03:10,650 --> 00:03:18,510 be timing to receive the data correctly, the timing is determined by the Boatwright's, which is defined 31 00:03:18,600 --> 00:03:21,060 as the number of bits sent per second. 32 00:03:22,460 --> 00:03:25,340 This table shows a list of you are Boatwright's. 33 00:03:29,300 --> 00:03:33,800 How can we describe your transmitter and receiver modules in Etchells? 34 00:03:34,850 --> 00:03:37,360 The next lecture will cope with this question. 35 00:03:40,080 --> 00:03:41,790 These are our takeaway messages. 36 00:03:42,850 --> 00:03:47,800 You are provides asynchronous data transmission between two digital system. 37 00:03:49,420 --> 00:03:55,900 There you are, data packet format consists of a start with followed by data, it's then an optional 38 00:03:55,900 --> 00:03:59,270 parity bit and finally one or two stop. 39 00:03:59,290 --> 00:03:59,620 It's. 40 00:04:02,590 --> 00:04:10,540 Now the question, what is your data packet for sending the value of zero one zero zero one one one 41 00:04:10,540 --> 00:04:10,920 zero? 42 00:04:11,680 --> 00:04:14,950 Please consider that even parity bit and to stop its.