This allows either twisted pair cables to be used with terminal blocks, or Ethernet Cat5e or Cat6e cable to be used with RJ45 jacks. These cables allow the dual RJ11 jacks of the RS485 option board of Laureate meters (digital interface ordering option 2) to be daisy chained and to be addressed digitally with no need for a hub. The USB to RS485 Converter is a cost-effective module for transfer serial data over USB. It is optimal for outdoor use cases that need reliable data collected over years. It does not specify or recommend any communications protocol; Other standards define the protocols for communication over an RS-485 link. RS-485 only specifies the electrical characteristics of the generator and the receiver: the physical layer. 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 RS232 DB-9M connector is compatible as a PC comport and the RS422/485 DB-9F follows the SMPTE pinout arrangement common to multimedia equipment. The CB485 can be used with a wide number of RS-485 converter ICs using the common MAX483 and MAX485 half-duplex 8-pin DIP pinout. The CB485 uses the ComBoard standard for interchangeable serial interface modules. The AVR1284-3U board uses removable UART interfaces called ComBoards. There are modules for RS323-DCE (DB9F), RS232-DTE (DB9M), and RS485 interfaces. All the interfaces are brought out to various connectors to easily hook up to accessory boards and peripheral ICs. It is easy to switch between different connectors and interface types. RS-485 does not define a communication protocol; merely an electrical interface. The equipment located along a set of RS-485 wires are interchangeably called nodes, stations or devices. With this boards, a CBL03 lines with RJ11 connectors can branch out to support an RS485 line consisting of three discrete wires.

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. Additionally, data can be transmitted at up to 10MBit/s which is faster than most standards. Control and monitoring systems: A single pair of rs485 signal cable can connect up to 32 devices, with a signal transmission distance of up to 1200m. Therefore, using rs485 cables is an ideal choice for industrial control and monitoring systems, especially those with large-scale and high dispersion. RS485 Termination : 120 Ohm (jumper selectable). RS485 Bias : 470 Ohm pull-up and pull-down (jumper selectable). RS485 is made for serial communication with high speeds, support for long distances, and support for multiple devices (slaves). Modbus devices communicate using a Master-Slave technique where only one device (the Master) can initiate transactions (AKA queries). RS485 allows multi-drop connects to create device networks with many devices talking to each other. Confirm serial port parameters such as baud rate, data bits, and stop bits: Baud rate should be configured according to the connected RS485 device, commonly used rates are 9600 and 115200; Refer to the device manual or contact RS485 device technical support for configuration, especially if set to Modbus mode, confirm if the function code matches.

Data rates of 100Kbps can be achieved over distances of up to 1200 meters. The RS485 chip converts CMOS level transmit (Tx) and receive (Rx) lines to differential RS485 voltages than can be sent over long distances. As mentioned, an example of serial communication is RS485. SenseCAP is compatible with a variety of communication protocols, including LoRa, 2G, 4G, NB-IoT, and more. USB to RS485 Converter ใช้ต่อกับ USB port ของ PC หรือ Note Book แปลงเป็นสัญญาณ RS485 Communication. Not more than one breakout board is required per RS485 line. This is an unpopulated board and no parts are included. The BOM (bill of materials) and schematic diagram are available below to construct the circuit. 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.

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