Common problems of wireless relay acquisition instrument

Hebei stable control technology Co., Ltd NLM5 Common problems of series relay acquisition and transmission instrument

 

1.UART Communication problems
Use UART When interfacing, make sure that the communication parameters of the sending and receiving sides are completely consistent , Including communication rate 、 Data bits 、 Check bit 、 Stop bit parameter .NLM When powered on, it will actively output the basic information of the equipment , If the upper computer connected to it can normally receive basic information, it indicates that the communication parameters are correct , If you cannot receive or receive “ The statement ” Then the communication parameters of the upper computer should be modified , By default NLM The communication parameters of are 115200,N,8,1.

2. Parameter access related problems
about NLM The parameter access of must be an instruction based on the device address （MDOBUS、 AABB、 character string ）, So first, confirm whether the device address in the instruction is correct . When using string instructions , Be sure to confirm the instructions 3 Are the leading symbols correct . The instruction leading symbol can be obtained from the power on information , See “ Check the basic information of the device ”. If the instruction leading symbol in the power on information is “ The statement ” perhaps “ empty ” when , You can use “@REST” Super command restores the device to the factory state .

3. How to save more electricity
（1） Set a longer collection and distribution time interval , Reduce the frequency of collection and distribution .
（2） Unneeded channels are configured as “ Do not send ”, Reduce the content of data sent .
（3） Use HEX Format send , Reduce the length of data sent .
（4） modify LoRA Parameters , Shorten sending time （ Not recommended ）.
（5） Turn off the wake-up listening function （ Only the scheduled collection and distribution function is reserved ）.
（6） Turn off the wake-up listening function , Set a very short time for sending a preamble , The receiving device is set to never sleep .
（7） Turn off the timed collection and distribution function （ Only use the wireless device to send wake-up and receive and send instructions to obtain sensor data ）.