What is Serial Communication? > 자유게시판

It may sound complicated for those who don’t know what is serial communication, so here’s an explanation. Compared to serial communication, USB and ethernet are significantly more complex and expensive. Serial communication also has a deterministic behaviour to avoid collisions of data packets, making it more reliable for a linkage system with many devices. SenseCAP is compatible with a variety of communication protocols, including LoRa, 2G, 4G, NB-IoT, and more. Typical uses are very large networks, monitor and control of elevators, machinery, lighting, security, fire and alarm, access, cameras, military ground support, and much more. We provide free technical support, no-argument warranty repairs, and recommendations for your application. 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. Laureate meters are modular with a middle slot reserved for a communication board, as illustrated in our Laureates Overview web page.

Serial communication is a way to send data. This auto transmit unit features Bi-directional serial conversion from RS232 to RS485 in 2 wire half-duplex communications mode. Should I use half-duplex or full-duplex RS485? RS485 at its core with 2 wires allows half-duplex data transmission. Variably, this time both TX and RX have their own 2 wires for data transmission. LoRaWAN Wireless Transmission: Ultra-low power consumption and ultra-wide-distance transmission range. SenseCAP S2100 data logger can collect data from multiple sensors and transfer the data through the LoRaWAN network. Modbus devices communicate using a Master-Slave technique where only one device (the Master) can initiate transactions (AKA queries). Most Modbus implementations use RS485 due to the allowance of longer distances, higher speeds and multiple devices on a single network. It is unquestionably an ideal choice for industrial equipment use due to its high speed, reliability, safety and versatility. It is also an ideal choice for industrial equipment use due to its high speed, reliability and safety. RS485 is made for serial communication with high speeds, support for long distances, and support for multiple devices (slaves). Both protocols (or communication languages) are built into the instrument’s firmware and are user selectable. The presence of a new board and the type of board are automatically sensed by the meter’s firmware or by Instrument Setup (IS) software.

User connections are an RJ11/12 telephone style for the RS232, a 3 pin removable screw terminal strip for the RS485 port, and a 2.1 mm barrel connector, or a 3 pin screw terminal strip for the power. Accessories available are a 12VDC Switching Power Supply(Wall Wart), an enclosure, and a 7ft DB9F to RJ11/12 RS232 cable. The most widely used communication standard is RS232. Their main difference boils down to one having only support for RS485, while the other one supports RS232 and TTL as well. In all other cases, half duplex and full duplex will work equally well. A meter will a thermocouple input and set for Modbus RTU needs to set to full duplex even if the wiring and the receiving unit are for half duplex. Setup is the same when multiple meters are interconnected via cables CBL03, except that all meters now need to be set to a different digital address via their front panel. Then use front panel programming to set the baud rate, protocol, digital address, half or full duplex, and other available parameters.

Set the PC to N81 for the Custom ASCII protocol, or to N82 or E81 for the Modbus RTU protocol. Modbus is the world’s most popular automation protocol in the market. 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. 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. This distance does not include the branches (which must nevertheless be short). The cable shield must be earthed only in one point. Each device has a communication port with two terminals, which are indicated for the sake of convenience as A and B. In these two terminals the communication cable is connected so that all the devices that take part in the communication are connected in parallel. Normally, this connection is made at one end of the main cable.

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