Using an RS-485 module to send data from an Arduino Mega to two devices using Cat5e Ethernet cable over a long distance.
This project utilizes the RS-485 protocol for long-distance communication between Arduino Mega boards. The setup includes three RS-485 modules, Ethernet cables, and RJ45 to screw terminal adapters to establish robust and reliable connections over extended distances.
Ethernet cables are an excellent choice for long-distance communication in RS-485 setups for several reasons:
Twisted Pair Design: Ethernet cables, such as Cat5e and Cat6, are constructed with twisted pairs of wires. This design helps cancel out electromagnetic interference (EMI) and reduces crosstalk between the wires, which is crucial for maintaining signal integrity over long distances.
Low Attenuation: Ethernet cables are designed to minimize signal loss over long distances. This characteristic ensures that data transmitted via the RS-485 protocol remains clear and accurate even when the communication lines span several hundred meters.
Durability and Availability: Ethernet cables are widely available and come in various lengths, making them a convenient and cost-effective choice for long-distance communication projects. Their robust construction also means they can withstand physical stress and environmental factors better than many other types of cables.
Shielding Options: Many Ethernet cables offer shielding (e.g., STP - Shielded Twisted Pair) to provide additional protection against EMI, which is particularly useful in electrically noisy environments.
Ease of Termination: The use of RJ45 connectors and screw terminal adapters simplifies the process of connecting and disconnecting devices, making the setup more user-friendly and adaptable.
By leveraging the benefits of Ethernet cables in an RS-485 communication system, this project achieves reliable and efficient long-distance data transmission, making it ideal for applications that require robust communication over extended distances.
In the source code, there are two programs:
1. Sender Program: Sends random data to two devices at different intervals.
2. Receiver Program: Reads data from Serial1 and prints it to the Serial Monitor.
TTL to RS485 module
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RJ45 To Screw Terminal Adaptor
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Source Code
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