The latest point of view on RS485 cables includes advancements in design to support higher data rates and improved resistance to environmental factors such as temperature fluctuations and moisture. The termination also includes pull up and pull down resistors to establish fail-safe bias for each data wire for the case when the lines are not being driven by any device. Their main difference boils down to one having only support for RS485, while the other one supports RS232 and TTL as well. There is a whole plethora of SenseCAP industrial-grade sensors, and this is just one of the many! SenseCAP is a wireless sensing platform developed specifically for Industrial IoT, with applications in smart agriculture, smart cities, and other environmental sensing scenarios. Our range of IIoT products is wide, with different sensors and hubs for different scenarios and requirements. It is a LoRaWAN converter that converts those sensors that are not LoRa-powered into LoRa-enabled sensors and therefore transfers data through the LoRaWAN protocol. Grove sensors to MODBUS RS485 industrial-grade sensors. RS-485 is used as the physical layer underlying many standard and proprietary automation protocols used to implement industrial control systems, including the most common versions of Modbus and Profibus. The RS485 system used for Modbus communication provides a main cable (Bus or backbone), to which all the devices have to be connected with branches (also known as stubs) that are as short as possible.

In this case it is possible to connect the main inlet and outlet terminal directly to the terminals of an instrument without creating a branch. In order to avoid errors when many devices are connected, cables of the same colour should be used for all the connections to the terminals A and cables of the same colour should be used for all the connections to the terminals B of the various devices (e.g. white for A and blue for B). As mentioned, RS485 is used to link devices instead of other means as it provides significant advantages. RS485 main advantages as compared to other serial communication are tolerance to electrical noise, lengthy cable runs, multiple slaves in one connection, and fast data transmission speed. Care must be taken that an SC connection, especially over long cable runs, does not result in an attempt to connect disparate grounds together - it is wise to add some current limiting to the SC connection. The main cable must be no longer than 700 m! As a rule of thumb, the speed in bit/s multiplied by the length in metres should not exceed 108. Thus a 50-meter cable should not signal faster than 2 Mbit/s.

SC, G or reference, the common signal reference ground used by the receiver to measure the A and B voltages. Similarly, TX and RX refer to the transmitted signal and received signal respectively. Interoperability of even similar devices from different manufacturers is not assured by compliance with the signal levels alone. Manufacturers are continuously improving the design and materials used in RS485 cables to ensure reliable and efficient data transmission in industrial environments. From the latest point of view, rs485 cable advancements in technology have led to the development of enhanced RS485 cables that can support even higher transmission speeds and longer distances. The cable shield must be earthed only in one point. The end resistance must be used only at the ends of the main cable. Care must be taken when using A/B naming. If you’re very sure that you are only using RS485 then you will not be disappointed with the former. Failure to stay within this range will result in, at best, signal corruption, and, at worst, damage to connected devices. Here at Seeed, we believe that the Internet-of-Things (IoT) will be a new class of digital and physical infrastructures that will allow a more intelligent society. Find out more about our different IIoT product solutions here!

This is an Industrial-grade 4G Data Logger from the Seeed’s SenseCAP product series. Here’s an example of a SenseCAP RS485 sensor! Easy to Use: The sensor can be used out-of-box through Bluetooth configuration, and users receive the data on the phone, cloud servers, and different platforms in just a few clicks. Templates can be exported and imported to support various applications. These cables are commonly used in industrial automation, building automation, and other applications where reliable and robust communication is necessary. 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. In addition to its physical characteristics, RS485 cables also have specific electrical properties that allow for differential signaling, enabling reliable data transmission over longer distances compared to other communication protocols. In this setup both the TX and RX share a single pair of wires, therefore it is limited to half-duplex data transmission as the data cannot be transmitted simultaneously to and fro each device. RS485 at its core with 2 wires allows half-duplex data transmission. It has Max.10 year of battery life and can cover a transmission range of 2km in urban scenes and 10km in line-of-sight scenes.