4G LTE Module USR-LTE-7S4 is used to transmit data between serial port and network server by Operator network. It is configured by AT Command and work in bi-directional transparent transmission mode.
USR-LTE-7S4 is in small size, which is widely used in LTE, WCDMA, TD-SCDMA. It works in transparent transmission mode and more functional software. It has high speed and less time-delay , supports FTP protocol.
USR-LTE-7S4 is compatible with 2G module 7S2/7S3, user can replace 7S3 easily. We add Watchdog function to ensure the stability in long-time working.
List of LTE networks: https://en.wikipedia.org/wiki/List_of_LTE_networks
Based on embedded Linux system, in high stability
SMS transparent transmission
Baud rate synchronization
Heartbeat package mechanism
FTP protocol upgrade
2)AT command configuration
Working Mode Introduction
1. Network transparent transmission mode
In this mode, User’s device can send data to specifie server by LTE network. G780 support 4 socket links. Four links are mutual independence.
2. HTTPD Client Mode
In this mode, User’ device can send/obtain data to/from HTTP server directly. The data will sent to Web server (apache, IIS, tomcat etc) in Http (GET/POST) mode as long as sending data in formal format. User can utilize the scripting language like PHP, ASP as database storage.
3. SMS transparent transmission mode
In this mode, user’s device can send SMS to specified phone number, or send the SMS from phone to device.
4. AT command
Whatever G780 working in any mode, user can send specified command to G780 to switch to AT command mode.