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It is designed with RS485 built-in to be connected to the above data logger, where the data will wirelessly transmit to the cloud. Devices will be linked together via a bus configuration as shown in the picture above. This means that data can be simultaneously transmitted and received between devices. As mentioned, RS485 is used to link devices instead of other means as it provides significant advantages. This means data can be transmitted in both directions to and fro devices one direction at a time. The transmitter and receiver compare the voltages of the data- and handshake lines with one common zero line. The RS485 network must be designed as one line with multiple drops, not as a star. Their main difference boils down to one having only support for RS485, while the other one supports RS232 and TTL as well. 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.

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 S2100 data logger can collect data from multiple sensors and transfer the data through the LoRaWAN network. The greatest feature of RS485 is the fact that you can connect up to 32 devices on one system. It comes in two versions, one with DC only, and another with a built-in rechargeable battery. The two-wire half-duplex system enables bidirectional data transmission between two devices, but not simultaneously. Developed by Modicon, Modbus enables different devices from different manufacturers to be integrated into the main system. RS-485 is also used in building automation as the simple bus wiring and long cable length is ideal for joining remote devices. RS485 is used as the physical layer for many standards and proprietary automation protocols to implement control systems, most commonly Modbus.

There are different serial communication standards such as RS232, RS422 and RS485. Serial communication also has a deterministic behaviour to avoid collisions of data packets, making it more reliable for a linkage system with many devices. Alarm systems: Rs485 cables in alarm systems help transfer alarm signals and information from alarm devices to the control center. What does all the information in this table tell us? This ensures that all security-related information and incidents are transmitted quickly and with high reliability. It is also an ideal choice for industrial equipment use due to its high speed, reliability and safety. It is generally recommended to use a 24AWG twisted pair cable with grounded shielding. The design of RS485 is targeted towards it being tolerant and forgiving to noise and long cable runs with the twisted pair cable arrangement. RS485 is however most popularly used in programmable logic controllers and factory floors where there are lots of electrical noise. Twisted pairs in RS485 communication however adds immunity which is a much better way to fight noise.

And that with an interface which does not require intelligent network hardware: the implementation on the software side is not much more difficult than with RS232. That is why RS485 is currently a widely used communication interface in data acquisition and control applications where multiple nodes communicate with each other. This robustness is the main reason why RS-485 is well suited for long-distance networking in noisy environment. Now, why don’t companies just use USB or ethernet to transmit data between their devices? Ultimately, it can be thought of in a way that serial communication is more made for this usage as compared to the common USB and ethernet. Another major advantage is that there can be more than one slave in the connection. RS232 could only handle one at a time. Variably, this time both TX and RX have their own 2 wires for data transmission. Because of this RS485 and the others can be used in situations with a severe ground level shift of several volts, where at the same time high bit rates are possible because the transition between logical 0 and logical 1 is only a few hundred millivolts. It also defines three generator interface points (signal lines); A, B and C. The data is transmitted on A and B. C is a ground reference.

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