USR-G781 User Manual
Technical Support:
h.usriot.com
Jinan USR IOT Technology Limited
www.usriot.com
24
2.3.2. Serial Port
2.3.2.1. Parameters range
Items
Parameters
Baud Rate
300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800
Data Bits
7,8
Stop Bits
1,2
Parity
NONE
EVEN
ODD
Flow Control/485
NFC: None Flow Control
485:When you use RS485, please choose this function
Figure36 Serial parameters
2.3.2.2. Serial Package Methods
For network speed is faster than serial. Module will put serial data in buffer before sending it to network. The
data will be sent to Network as Package. There are 2 ways to end the package and send package to network -
Time and Length.
2.3.2.2.1. Time Trigger Mode
If no data get from serial over the time threshold, it will end the package and send this package to network. The
range of threshold is from 10ms ~ 60000ms. Default is 50ms. If the serial keeping send data, this package will be
1K bytes.
2.3.2.2.2. Length Trigger Mode
The package will be sent to network when it up to length threshold. The range of length threshold is from 1 to
4096 bytes. Default is 1000 bytes.
2.3.2.3. Baud Rate Synchronization
When module works with USR devices or software, serial parameter will change dynamically according to
network protocol. Customer can modify serial parameter by sending data conformed to specific protocol via
network. It is temporary, when restart DTU, the parameters back to original parameters.
