RAK7431
8
3
Interfaces
Figure 4 |
RAK7431 bottom panel
Power supply and configuration interface:
RAK7431 can be powered by its DC terminal or via its Micro USB port.
The DC terminal accepts 8-48V DC input, and the rated power of the device is 1W. Pay
attention to the positive and negative pole directions when crimping the terminal. Vin is
connected to the positive pole of the power supply, and GND is connected to the negative
pole of the power supply.
The Micro USB port can also be used for powering the device (5V / 500mA DC).
At the same time, the Micro USB port can be used as the configuration interface of the device.
Connect it to a PC and use the
RAK Serial Port Tool
to open a COM port. The default baud
rate is 115200. There is a standard set of AT commands that can be used to configure the
RAK7431.
Data interface:
When connecting to RS485 nodes, please connect 485A and 485B on the data interface of
RAK7431 with the A and B lines of the RS485 bus. Connect the GND terminal to the GN line
of the RS485 devices The RS485 bus carrying capacity of RAK7431 goes up to 16 RS485
terminals at the same time.
The Vout on the data interface can supply power to the RS485 terminals (
only valid when
using the DC input interface power supply, USB power supply is invalid
). The Vout output
voltage is the same as DC input voltage Vin.
