User Guide

IoT into the Wild

6.6 Configure RS485 Modbus-RTU Sensor via App

Select the “Protocol” as “RS485 Modbus RTU”. Then set the following parameters in turn.

Baud Rate

Baud rate of communication with the sensor.

Range: 4800/9600/14400/19200/38400/57600/115200

Modbus Address

Slave address of the sensor. The range is 1 to 247.

Power Type

Periodic power: Power the sensor before data collection, and power

off the sensor after data collection. This mode reduces power

consumption and increases battery life.

Always-on: Select this mode when the sensor needs constant

power supply. Generally, an external 12V DC power supply is used.

If it is powered only by batteries, it may not work for long.

Power Voltage

Select the supply voltage to the sensor. It supports 3V/5V/12V.

Please refer to section "Power Supply Options of Sensor".

Sensor Warm-up Time

The warm-up time denotes the amount of time it takes for the

sensor to attain its highest accuracy or performance level once the

voltage supply has been applied.

Response Timeout

After Data Logger initiates a data read request to the sensor, it

waits for the timeout time for a response. If this time is exceeded,

the command will be resent; unit: 100 milliseconds.