USR-GM3/GM3s User Manual www.usr iot . c o m
Jinan USR IOT Technology Limited 2 / 55 tec@usr.cn
Content
USR-GM3/GM3s User Guide ......................................................................................................................................... 1
Quick Start ......................................................................................................................................................................... 3
1.1. Testing environment ......................................................................................................................................... 3
1.2. Transmission ..................................................................................................................................................... 4
2. Introduction ................................................................................................................................................................... 6
2.1. Short Description .............................................................................................................................................. 6
2.2. Characteristic .................................................................................................................................................... 6
2.3. Features ............................................................................................................................................................. 6
2.4. Application Field ................................................................................................................................................ 7
3. Hardware ....................................................................................................................................................................... 8
3.1. Pin Description .................................................................................................................................................. 8
3.1.1. Outside View .......................................................................................................................................... 8
3.1.2. Pin Assignment （
Top
）....................................................................................................................... 8
3.1.3. PCB Layout ............................................................................................................................................ 8
3.1.4. Pin Description ....................................................................................................................................... 9
3.1.5. Outside Antenna ..................................................................................................................................
11
3.2. Hardware B lock D iagram ..............................................................................................................................
11
4. Module Functions ......................................................................................................................................................
11
4.1. Work Mode ...................................................................................................................................................... 12
4.1.1. Switching Work Mode ......................................................................................................................... 12
4.1.2. Network transmission ......................................................................................................................... 12
4.1.3. HTTPD Function ................................................................................................................................. 20
4.1.4. SMS Message Transmission ............................................................................................................. 23
4.2. Register Package ........................................................................................................................................... 27
4.2.1. Description ........................................................................................................................................... 28
4.2.2. Usage .................................................................................................................................................... 28
4.3. Heart Beat Package ....................................................................................................................................... 29
4.3.1. Description ........................................................................................................................................... 30
4.3.2. Usage .................................................................................................................................................... 30
4.4. UART ................................................................................................................................................................ 31
4.4.1. RS485 ................................................................................................................................................... 32
4.4.2. Similar RFC2217 ................................................................................................................................. 32
5. Parameters Setting .................................................................................................................................................... 33
5.1. Operating
AT
command ................................................................................................................................. 34
5.2.
AT
Command Format ..................................................................................................................................... 35
5.3.
AT
Command Set ........................................................................................................................................... 37
Appendix A: Contact ...................................................................................................................................................... 54
Appendix B: Disclaimer ................................................................................................................................................. 55
Appendix C: Update History ......................................................................................................................................... 55
