Chengdu Ebyte Electronic Technology Co.,Ltd.
User Manual
Copyright ©2012–2020
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
53
8.1.5 The communication between the two modules is unsuccessful, and the NET
light does not light up
Whether to connect the antenna (the distance between the two antennas should be greater than 1.5M). Antennas
cannot be placed in a closed tin cabinet (preferably in an open area).
Check whether the configuration information of the communication module is consistent (channel, airspeed,
address).
The communication distance of 485 is too far. It is necessary to add a resistor below 1K ohm on the AB end of 485,
preferably on both the sending and receiving ends.
The LoRa communication distance is too far or there are too many metal shields in the surrounding environment,
consider replacing high-power products.
8.1.6 The communication between the two devices is unsuccessful, but the NET
light is always on
The DI acquisition end sensor is damaged or the sensor wiring is wrong.
a. Check if the DI light of the acquisition module is always on, the input signal is acquired, otherwise, no.
b. Check whether there is any problem with the sensor wiring connected to the acquisition device. Please verify
the sensor type and wire it according to the correct wiring method.
c. Sensor damage: Use a multimeter to measure the voltage of the sensor signal line.
The DO output is wired incorrectly.
a. Users need to check and connect the acquisition module wiring method of the company's DO products. The
company's DO products are passive output. For details, please refer to the chapters such as "Hardware
Connection of Switch Input and Output".
b. The user can verify that the DO product of our company is not connected to any load, and then connect the
buzzer of the multimeter to the DO signal terminal to observe whether the port output will ring.
8.2 LoRa related questions
8.2.1 LoRa communication, what should be paid attention to?
When testing the K61-DL20 module, a matching antenna or a 50Ω dummy load must be connected, otherwise the
transmitter module will be easily damaged.
K61-DL20 often has different communication distances in different environments. The communication distance is
often affected by temperature, humidity, obstacle density, obstacle volume, and electromagnetic environment. It is
recommended that customers actually measure on site.
8.2.2 LoRa communication, what is the actual communication distance of the
4KM or 8KM module?
For LoRa communication, the communication power of the 4KM version is usually 0.16W (22dBm); the communication
