UNIVERSITI TEKNOLOGI MALAYSIA - FKE - UTM

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354.3.3 Null Character ProblemFigure 4.6 Overview of Communication between GPS receiver (MS1E) & ClientCommand Center DriverThe present of NULL character (ASCII 0 or Hex 00) within the PDUmessage causes the message being truncated by the Comm. Driver at ClientCommand Center (Stage 3).At stage 1, the modem driver at MS1E (AT_SM_Modem) adopts SMSPDU mode to send GPS data packets via wireless modem.The user data in PDU mode is sent to SMS Center in binary format for example:0A10412274E600000000043AFF210013000500 (hex)As we can notice here, there are 7 Null Characters in the PDU message.At stage 2, the user data (binary format) is received by SMS Center andtransferred to client command center communication driver via direct TCP/IPLink.Here, the user data is still in binary format as the following:
360A10412274E600000000043AFF210013000500 (hex)At stage 3, the problem occurs at current state. The Communication Driverat client command center is initially built for receiving character string in ASCIIformat. Every NULL character (ASCII 0 or Hex 00) will be treated as end ofstring.When the user data with Null characters as in Stage 2 is transferred toCommunication Driver, it will be truncated at the position of Null character.Incoming Message:0A10412274E600000000043AFF210013000500 (hex)Received Message:0A10412274E6 (truncated at Null Character position).The message after the terminator character (0000) can’t be received. Hence,the complete user data in PDU mode could not be received by the processingapplication.4.3.3.1 Processing of Null Character in PDU MessageOriginal PDU MessageThe user data in PDU mode:0A10412274E600000000043AFF210013000500
Page 1 and 2: UNIVERSITI TEKNOLOGI MALAYSIAPSZ 19
Page 3 and 4: “I hereby declare that I have rea
Page 5 and 6: iii“I hereby declare that the the
Page 7 and 8: vACKNOWLEDGEMENTFirstly, I would li
Page 9 and 10: viiABSTRAKPetani pada zaman ini sen
Page 11 and 12: ix2.3 The GPS System 82.3.1 GPS Rec
Page 13 and 14: xiLIST OF TABLETABLE NO. TITLE PAGE
Page 15 and 16: xiii5.4 Location information 485.5
Page 17 and 18: 2earthquake studies. As for my proj
Page 19 and 20: 41.4 ScopeThe main emphasis of this
Page 21 and 22: 6CHAPTER 2LITERATURE REVIEW2.1 Intr
Page 23 and 24: 8processing and digital control mac
Page 25 and 26: 10value. When you measure the dista
Page 27 and 28: 122.4.1 GPRSGeneral Packet Radio Se
Page 29 and 30: 14iv. Alerts and notifications.a) E
Page 31 and 32: 16Figure 2.4 Internal view of b’A
Page 33 and 34: 18internal pull-up resistors R12 an
Page 35 and 36: 20CHAPTER 3THEORY3.1 IntroductionTh
Page 37 and 38: 223.3 AT commandThis project will a
Page 39 and 40: 24CHAPTER 4METHODOLOGY4.1 Introduct
Page 41 and 42: 264.3 Software ImplementationThe en
Page 43 and 44: 28Init. DS19231Wait for 5 secondsB
Page 45 and 46: 304.3.2 The PDU formatBefore we beg
Page 47 and 48: 32The rightmost bit of the second c
Page 49: 34Upper Byte:- Reservedx 1 = Roamin
Page 53 and 54: 38In case of there’s no occurrenc
Page 55 and 56: 40// insert Current Temp (1W), iBut
Page 57 and 58: 42// or UserTask Receive ISYS messa
Page 59 and 60: 44Forbid();wConfig1 =LOG_OperationP
Page 61 and 62: 46The figure shows the web page whi
Page 63 and 64: 48Figure 5.4 Location informationFi
Page 65 and 66: Figure 5.8 Google Earth50
Page 67 and 68: 52themselves to collect the data. T
Page 69 and 70: 54REFERENCES1. Sanders G., Thorens
Page 71 and 72: 56WeekActivitie s3 4 5 6 7 8 9 10 1
Page 94: 79APPENDIX CGSM MODULE DATASHEET
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UNIVERSITI TEKNOLOGI MALAYSIA - FKE - UTM

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