1. Whether it supports one master and multiple slaves; 

BT02 does not support one master and multiple slaves,E74 can send BT02 slaves to the mast.

2. To transmit data to the module through the serial port, is there any requirement for the data length of one transmission, if not, is there any requirement for the sending interval of each data packet?

19200 and below can support continuous transmission. At this time, users can send data with any packet length at any time. The master sends to the slave, preferably no more than 20 bytes at a time.

LoRaWAN gateways and LoRaWAN nodes are key components to achieve the goal of building an intelligent Internet of Things. Together they form a powerful wireless communication network that provides reliable data transmission services for various application scenarios. At the same time, its low power consumption characteristics It provides longer battery life for IoT devices, reduces the frequency of battery replacement, and makes the device more intelligent and convenient.

LoRaWAN gateway is a hardware device integrated with the LoRaWAN protocol. The LoRaWAN gateway is responsible for forwarding data from the LoRaWAN node to the Internet or other networks. The main functions of the gateway include: routing, data processing, security encryption and authentication, etc. Through gateways deployed in different locations, remote monitoring and management of IoT devices can be achieved, improving the reliability and scalability of the system. In addition, LoRaWAN focuses on communication security. The AES-128 encryption algorithm is used to ensure the safe transmission of data and prevent data leakage and illegal access. This makes the LoRaWAN protocol a reliable and secure communication method in IoT applications.

LoRaWAN node module is a wireless communication module based on LoRaWAN technology. The LoRaWAN module has the characteristics of low power consumption, long distance and anti-interference, and is suitable for various IoT application scenarios. The LoRaWAN node module can communicate with the Internet or other networks through the gateway and upload the collected data to the cloud for analysis and processing. In addition, the LoRaWAN node module can also communicate with other nodes to achieve collaborative work between devices and improve the efficiency of the entire system.

Ebyte's LoRaWAN series products have full regional file coverage from gateways to nodes, which can meet regional needs to the greatest extent. They also support standard LoRaWAN protocol version 1.0.3.

2.4 wireless module is a short-range wireless radio frequency module that applies 2.4g wireless technology. Since the frequency band is between 2.400GHz~2.4835GHz, it is referred to as 2.4G wireless module. The 2.4g frequency band is a globally common ISM (i.e. industrial, scientific, medical) frequency band and has great market prospects.
Both the Bluetooth module and the 2.4g wireless module work in the 2.4G frequency band; if they are in close contact, will they cause interference?

The answer is, absolutely. And the impact is not small, especially in cities, where there are 2.4g or Bluetooth wireless networks everywhere, such as common monitoring, indoor environments, etc. Bluetooth modules and 2.4g wireless modules are inherently short-range modules. If the two wireless modules are in close contact, the transmission distance may become shorter, and even affect normal communication.

If we find that the Bluetooth module and the 2.4g wireless module interfere with each other in practical applications, the best way is to stagger the frequency. To put it simply, switch to a frequency that is not interfered with. For example: If the interference at the 2.4000GHz frequency is severe and normal communication is impossible or the distance is very short, we can switch to the 2.4835GHZ frequency. Anyway, any frequency in the 2.4g band is acceptable.

Using the default parameters, the demand is more than 4km, the customer has 12 modules with 5V power supply, open suburbs, and the power output is rated at 2A. The transmitter is a suction cup antenna, and the receiver is a glue stick antenna, 1.5-2 meters from the ground. The maximum power supply ripple is ±15mv. Multiple environmental tests, all of which do not exceed 2km, are all in this situation. Please help analyze how to improve the distance. Is there anything else that needs attention?

Answer:

If there is no adsorption, adsorption is recommended; there are two options:

1. Replace the antenna of the transmitting end with TX433-XPH-300,

2. Try replacing the antenna of the receiving end with TX433-JK-20, and at the same time, the suction cup is adsorbed on the iron sheet.

LoRa and LoRaWAN are very popular wireless communication technologies in the current field of Internet of Things. LoRa is a physical layer technology and LoRaWAN is a communication protocol. They use low-power broadband wireless modulation technology to provide long-distance communication services in long-distance, low-speed and low-power scenarios.

The principle of LoRa technology has been introduced previously. Simply put, LoRa technology uses spread spectrum modulation technology to achieve long-distance transmission and low power consumption by changing the spreading factor and code rate of the signal. LoRa technology is widely used in the Internet of Things, smart homes, industrial control and other fields.

LoRaWAN technology is a communication protocol built on LoRa technology. LoRaWAN defines a wireless communication protocol based on a star topology, allowing devices to connect to the network wirelessly to achieve communication and control with the cloud. Compared with traditional GPRS, 3G, 4G and other communication technologies, LoRaWAN has significant advantages in long-distance transmission and low power consumption, so it is widely used in the field of Internet of Things.

The tool we use is XDS100V3.0 JTAG interface.

Please re-power on and test it with the latest version of the parameter configuration software.

E05-MLE132AP2 has a signal when the programmer is connected, but there is no signal if the programmer is not connected. What is the reason?

Answer:

The problem caused by the short circuit of P0.3 (TXD) and PROG pin; please contact the technical staff for detailed solutions.

Check if the jumper cap is connected correctly.