In what case does device send data

1.Device power up
After completely start, device sends all of status one time, include DI, AI, DO, TI, Modbus registers etc.

2.Device alarm
Alarm events trigger device to upload data automatically, Such as DI alarm (status changes), analog input, modbus register, temperature humidity input alarm (go out of normal range), power lost etc.

3.Upload data by timer
Can setup interval or schedule in timer to upload data