The wireless data transmission module mainly uses RS485 communication method to transmit wired collection end data to the module, and then transmits the data through wireless transmission to realize data transmission between wired devices and wireless devices.
The wireless data transmission module is mainly connected to the terminal device through the RS485 interface. The terminal device sends data to the wireless data transmission module through the RS485 interface. The wireless data transmission module can transparently send the data to the customer’s server through the wireless network; conversely, the server For data sent to the wireless data transmission module, the wireless data transmission module will also transparently send the received data to the connected terminal device through RS485, thereby realizing communication between the client terminal device and the server.
Introduction to basic networking topology
1. Server public network fixed IP method
The wireless data transmission module actively initiates a communication connection with the server and operates reliably and stably.
2. Server public network dynamic IP method
The wireless data transmission module supports the function of connecting domain names. If there is no fixed IP on the server side, the domain name can be bound on the server side. The wireless data transmission module can connect to the server by accessing the domain name bound to the server.
3. APN (VPDN) private network method
The wireless data transmission module supports the APN (VPDN) function. Customers who have applied for the APN (VPDN) network can easily realize network communication between the terminal and the data center through IP MODEM.
4. Point-to-point method
When you only need to realize remote communication between two serial port terminals, you can use point-to-point transmission.
Point-to-point transmission uses one wireless data transmission module as the server and another wireless data transmission module as the client to establish mapping between the two wireless data transmission modules to achieve one-to-one wireless communication between the two terminals.
ZHC4921 is an Internet of Things wireless data transmission module that uses the operator’s 2G/3G/4G network to provide users with wireless long-distance data transmission functions and supports a variety of communication protocols, such as Modbus RTU /TCP, MQTT, etc.
This product adopts a high-performance industrial-grade communication processor and uses an embedded real-time operating system as the software support platform. It also provides an RS485 interface that can be directly connected to serial devices to achieve transparent data transmission; it provides 4 channels of DI, 4 channels of DO, and 4 channels of DO. Channel AI can realize digital input and output, analog input, pulse output, pulse counting and other functions. This product can meet the interconnection needs of various scenarios, has strong compatibility and adaptability, and is widely used in various industries.
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