User's Manual

GM28 INTEGRATOR’S MANUAL
4
LZT 123 7468 P1A
3.1 Switching On the Modem............................................................................. 36
3.2 Switching Off the Modem ............................................................................ 36
3.3 Resetting the Modem.................................................................................... 36
3.4 Operating States/LED................................................................................... 37
4. Hints for Integrating the Modem..........................................................................38
4.1 Safety Advice and Precautions..................................................................... 38
4.1.1 General............................................................................................38
4.1.2 SIM Card .........................................................................................38
4.1.3 Antenna............................................................................................39
4.2 Installation of the Modem............................................................................. 39
4.2.1 Where to Install the Modem ............................................................39
4.2.2 How to Install the Modem ...............................................................41
4.3 Antenna .......................................................................................... 41
4.3.1 General............................................................................................41
4.3.2 Antenna Type...................................................................................42
4.3.3 Antenna Placement..........................................................................42
4.3.4 The Antenna Cable ..........................................................................42
4.3.5 Possible Communication Disturbances...........................................43
4.4 Attachments .......................................................................................... 43
5. Technical Data ........................................................................................................44
Part 3: Using AT Commands.............................................................................. 49
1. Introduction to AT Commands.............................................................................51
1.1 Overview .......................................................................................... 51
1.2 Syntax Description ....................................................................................... 51
1.2.1 Conventions .....................................................................................51
1.2.2 AT Command Syntax .......................................................................52
1.2.3 AT Response Syntax.........................................................................53
1.3 Error Codes .......................................................................................... 55
1.3.1 +CME ERROR (Mobile Equipment Error Code) ...........................55
1.3.2 +CMS ERROR (Message Service Failure Result Code).................56
1.4 Examples on How to Use the AT Commands............................................. 57
2. Call Control.............................................................................................................59
2.1 AT+CPIN PIN Control ...................................................................... 59
2.2 ATA Answer Incoming Call ..................................................... 59
2.3 ATD Dial................................................................................... 60
2.4 ATH Hang up ............................................................................ 62
2.5 ATO Return to Online Data Mode ............................................ 62
2.6 ATP Select Pulse Dialling ........................................................ 62
2.7 ATT Select Tone Dialling......................................................... 62
2.8 ATX Call Progress Monitoring Control.................................... 63
2.9 AT+CHUP Hang up Call .................................................................... 63
2.10 AT+CMOD Call Mode......................................................................... 64
2.11 AT+CVHU Voice Hang-Up ................................................................ 65