The aforementioned SenseCAP Sensor Hub at its stock has only 4 ports to connect RS485 sensors despite it being able to support up to 32 different RS485 sensors. Designed to be used with the SenseCAP Sensor Hub, this splitter is able to "split" one MODBUS RS485 port into 4. The RS485 splitter has one male interface that connects to the Sensor Hub and four female interfaces that link to the sensors. There is a whole plethora of SenseCAP industrial-grade sensors, and this is just one of the many! It can connect up to 32 RS-485 sensors, designed by industry standards. Designed with industry standards, it comes with a waterproof aviation connector to ensure that your connection will not be affected by the elements. Being a connector that is frequently used outdoors in severe environments, it is designed to be IP68-rated waterproof and dustproof. The design of RS485 is targeted towards it being tolerant and forgiving to noise and long cable runs with the twisted pair cable arrangement. If the PC is connected to the multiple Laureate instruments on an RS485 bus via an Ethernet-to-RS-485 gateway board or a USB-to-RS485 gateway board, use Laurel’s free XLOG2 datalogging software. The condition is that the communication wire is high-quality and meets the standard, the baud rate is 9600, and only one 485 device is loaded, so that the communication distance can reach 1200 meters, so the actual and stable communication distance of the 485 bus is usually less than 1200 meters.
The InitSPI() function provides a convenient way to initialize the SPI as the master at a 2MHz baud rate. However, in a full-duplex setup, they are limited to a master and slave communication where slaves cannot communicate with each other. Data rates of up to 10M bps are supported over short distances (40ft.). At the four-thousand foot distance limit, data rates of up to 100K bps are allowable. However, the length can be extended considerably with a trade-off with slower data rates. RS485 is also commonly used for building automation as the simple wiring configuration and lengthy cable length are ideal for joining remote devices. The two jacks are for RS485 cable in and RS485 cable out. There are several protocols that govern the format of exchanged data, with the RS232 protocol used primarily by personal computers, and the RS485 protocol used in industrial control systems. This is great for Supervisory Control and Data Acquisition (SCADA) systems where there are many devices and it also comes at a very low cost to implement. So take advantage of that and let your systems MCUs implement heart beat handshaking directly though the RS485 communications layer using appropriately designed small packets. The twisted pairs in RS485 give immunity against electrical noise, making RS485 viable in electrically noisy environments.
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. A three-post jumper located between the third socket and H6 configures the primary serial port for either RS232 or RS485 operation. Their main difference boils down to one having only support for RS485, while the other one supports RS232 and TTL as well. 20mA), RS485, and GPIO(Pulse). Powerful APP Support: SenseCAP Mate APP allows you to set the sensor templates and quickly turn the data logger into the sensor you want. SenseCAP Data Logger and IoT Platform Compatible: Convert to a SenseCAP LoRaWAN® sensor with SenseCAP Data Logger and take advantage of quick and easy set-up in just 5 minutes with SenseCAP Mate APP. Supports Third-party Data Loggers and IoT Platforms: Besides SenseCAP Data Logger, developers could connect to other data loggers that support MODBUS RS485 protocol and third-party IoT platforms. SenseCAP S2100 data logger can collect data from multiple sensors and transfer the data through the LoRaWAN network. Grove sensors to MODBUS RS485 industrial-grade sensors.
And now the most important question, how does RS485 function in practice? The four-wire system can only realize point-to-point communication, which is rarely used now. The differential voltage system also allows the RS485 to provide longer data transfer distance and lower voltage use, which helps to increase data speed. Up to 32 slaves can be connected in the system. A slave will never transmit any data or perform any action without a request from the master, and slaves cannot communicate with each other. RS485 is made for serial communication with high speeds, support for long distances, and support for multiple devices (slaves). The pinout of the Communications Connector (H14) is shown in Table 11 2, and the following diagrams show how these signals map to the two serial communications connectors. There is a huge benefit of the RS-485 electrical layer protocol that allows for long distance communications in the presence of multiple volts of common mode voltage differences between the two ends. There are two communication protocols available: Toshiba Inverter Protocol and MODBUS-RTU Protocol (this command does not support all commands). In RS485 standard, data is transmitted via two wires twisted together also referred to as "Twisted Pair Cable".
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