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LZT 123 7263 R1C
4.3.1 General ........................................................................................... 72
4.3.2 Antenna Type .................................................................................. 73
4.3.3 Antenna Placement ......................................................................... 73
4.3.4 The Antenna Cable.......................................................................... 73
4.3.5 Possible Communication Disturbances .......................................... 74
5. Technical Data........................................................................................................ 75
6. Declaration of Conformity .................................................................................... 77
7. FCC Certificate ...................................................................................................... 78
Part 4: Using AT Commands.............................................................................. 79
1. Introduction to AT Commands ............................................................................ 81
1.1 Overview ......................................................................................... 81
1.2 Syntax Description ....................................................................................... 81
1.2.1 Conventions..................................................................................... 81
1.2.2 AT Command Syntax....................................................................... 82
1.2.3 AT Response Syntax ........................................................................ 84
1.3 Error Codes ......................................................................................... 85
1.3.1 +CME ERROR (Mobile Equipment Error Code)........................... 85
1.3.2 +CMS ERROR (Message Service Failure Result Code) ................ 86
1.4 Examples on How to Use the AT Commands ............................................ 87
1.5 SMS Text Mode ......................................................................................... 87
1.6 GPRS Communication................................................................................. 89
2. Call Control ............................................................................................................ 91
2.1 AT+CPIN PIN Control...................................................................... 91
2.2 ATA Answer Incoming Call..................................................... 91
2.3 ATD Dial .................................................................................. 92
2.4 ATH Hang up............................................................................ 94
2.5 ATL Monitor Speaker Loudness .............................................. 94
2.6 ATO Return to Online Data Mode............................................ 95
2.7 ATP Select Pulse Dialling........................................................ 95
2.8 ATT Select Tone Dialling ........................................................ 95
2.9 ATX Call Progress Monitoring Control ................................... 96
2.10 AT+CHUP Hang up Call .................................................................... 96
2.11 AT+CMOD Call Mode ........................................................................ 97
2.12 AT+CVHU Voice Hang-Up ................................................................ 98
2.13 AT+VTS DTMF and Tone Generation ........................................... 98
3. Control and Status ............................................................................................... 101
3.1 ATQ Result Code Suppression ............................................... 101
3.2 ATS0 Automatic Answer Control............................................ 101
3.3 ATS2 Escape Sequence Character ........................................... 102
3.4 ATS3 Command Line Termination Character ......................... 102
3.5 ATS4 Response Formatting Character..................................... 103