4G_2G DTU Products Function
- 20 -
Figure 21.
Specify Socket Channel Communication Transmission
1.7. Serial Frame Scheme
When the DTU receives data from the UART, it constantly checks the interval between two
adjacent bytes. If the interval is greater than a certain value, then one frame is considered to have
ended, otherwise the data is received until the buffer byte (512 bytes). The module determines that the
Socket channel is forwarded after the end of one frame on the serial port.
The default 2-byte interval of the module is 200ms, that is, when the interval is greater than
200ms, one frame ends.
Figure 22.
Serial Frame Scheme
1.8. Firmware Updates
DTU supports firmware upgrade through serial port and network mode.
