USR-GM3 User Manual www.usriot.com
Jinan USR IOT Technology Limited 2 / 54 tec@usr.cn
Content
USR-GM3 User Guide....................................................................................................................................................... 1
Quick Start........................................................................................................................................................................... 3
1.1. Testing environment........................................................................................................................................... 3
1.2. Transmission....................................................................................................................................................... 4
2. Introduction......................................................................................................................................................................5
2.1. Short Description................................................................................................................................................ 5
2.2. Characteristic.......................................................................................................................................................6
2.3. Features............................................................................................................................................................... 6
2.4. Application Field..................................................................................................................................................6
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.............................................................................................................................................. 9
3.1.4. Pin Description...................................................................................................................................... 10
3.1.5. Outside Antenna.................................................................................................................................... 11
4. Module Functions.........................................................................................................................................................12
4.1. Work Mode........................................................................................................................................................ 12
4.1.1. Switching Work Mode...........................................................................................................................12
4.1.2. Network transmission...........................................................................................................................13
4.1.3. HTTPD Function................................................................................................................................... 20
4.1.4. SMS Message Transmission.............................................................................................................. 24
4.2. Register Package............................................................................................................................................. 28
4.2.1. Description............................................................................................................................................. 28
4.2.2. Usage......................................................................................................................................................28
4.3. Heart Beat Package.........................................................................................................................................29
4.3.1. Description............................................................................................................................................. 29
4.3.2. Usage......................................................................................................................................................30
4.4. UART.................................................................................................................................................................. 31
4.4.1. RS485..................................................................................................................................................... 31
4.4.2. Similar RFC2217...................................................................................................................................31
5. Parameters Setting......................................................................................................................................................33
5.1. Operating AT command...................................................................................................................................33
5.2. AT Command Format.......................................................................................................................................34
5.3. AT Command Set............................................................................................................................................. 36
Appendix A: Contact........................................................................................................................................................ 54
Appendix B: Disclaimer................................................................................................................................................... 54
Appendix C: Update History........................................................................................................................................... 54
