9 Rules for Correct Cabling of the Modbus RS485 Communication Systems

From the latest point of view, advancements in technology have led to the development of enhanced RS485 cables that can support even higher transmission speeds and longer distances. Above you can see where I toggle the pump running LED on and off when necessary. Flexibility - RS485 can be used in a wide variety of applications and can be easily adapted to changing needs. RS485 cable is a type of communication cable used in industrial applications to transmit data between devices over long distances. In full-duplex, data can flow simultaneously in both directions between devices. RS485 cable is a type of communication cable commonly used in industrial settings to transmit data between devices. Serial communication also has a deterministic behaviour to avoid collisions of data packets, making it more reliable for a linkage system with many devices. RS232, RS422, RS423 and RS485 are serial communication methods for computers and devices.

RS485 is made for serial communication with high speeds, support for long distances, and support for multiple devices (slaves). Converters between RS-485 and RS-232 are available to allow a personal computer to communicate with remote devices. RS-485 cables typically have two twisted pairs of wires for differential signaling, allowing for greater immunity to electromagnetic interference. RS485 cables typically consist of twisted pairs of wires with a characteristic impedance of 120 ohms, which helps reduce signal reflections and interference. RS485 cables typically consist of twisted pairs of wires with a characteristic impedance of 120 ohms, which helps to minimize signal reflections and interference. Overall, RS485 cables are known for their robustness, reliability, and versatility, making them a popular choice for industrial automation, building control systems, and other applications requiring stable and secure communication over extended distances. Generally, RS485 cables can support data rates ranging from 100 kbps to 10 Mbps, making them suitable for a wide range of industrial applications. The maximum cable length for an RS485 network depends on the data rate and the cable’s quality.

Modbus uses a master-slave architecture, where the master device controls the communication on the network. If the 8-core cable shipped with the device is used for RS485 communication, please trim the length and try to use a short wire to reduce noise interference. What made it such an advancement over RS232 was the fact that it could transmit not only a single device to device transmission, but also a communications bus to connect multiple devices at once. Devices utilizing RS485 can communicate with central control systems using communication protocols such as Modbus and ASCII. RS485 is also commonly used for building automation as the simple wiring configuration and lengthy cable length are ideal for joining remote devices. Remarkably, RS 485 excels in extended-distance communication without requiring additional boosters, making it ideal for interconnecting machines in factories or managing communication in large buildings. It can operate reliably over distances of up to 1.2 kilometers (about 4,000 feet) or more, making it suitable for applications requiring communication across large areas. The issue also exists in programmable logic controller applications.

Enter Russell Goldin (tageyoureit) and his pool controller software project. I have various buttons, switches and LEDs on the physical unit that allow me to see if the sprinklers are running, the pump is running, the pool is filling or if there is a system error of some sort. I determined by measuring water flow that I lost about 50% of my filling flow while the pump was running, so I figured it would be best to not fill while the pump was running at all. I also have a momentary switch (second on the left) that allows me to manually fill my pool when I want, and finally on the left side I have a DPDT switch that physically interrupts power from my system to the sprinkler valve and triggers a GPIO event to tell the system we have manually disabled filling the pool. Nothing works when this switch has been triggered and if something were to fail programmatically, no power can make it from the transformer to the sprinkler valve regardless. My main application runs every 60 seconds, so if my sprinklers are running, I just do nothing for another 60 seconds and check again.

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