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Detailed Explanation of HART to MODBUS Local Display Converter and Its Application Scenarios 1.1 Product Introduction The SM200-A HART data display unit is a high-tech product that integrates the HART protocol with RS232/RS485 communication; it functions as a micro RTU system. It is based on a high-end ARM microcontroller and consists of high-precision operational amplifiers, interface chips, hardware watchdog circuits, input/output circuits, etc. It also incorporates communication modules and HART modem chips, offering stable performance and an excellent cost-performance ratio. The hardware design of the SM200-A HART data display unit fully complies with industrial standards. It features specialized designs in terms of temperature range, vibration resistance, electromagnetic compatibility, and interface diversity, ensuring stable operation in harsh environments and providing high-quality performance for your equipment. 1.2 Product Performance ● Equipped with standard RS232 and RS485 communication interfaces, allowing for parameter configuration, adjustment of the communication baud rate, and setting of parity bits. It is independent of the 1200 communication speed on the HART bus, thereby improving the operation speed of the entire system. ● It is equipped with dedicated configuration software that allows for parameter setting of the SM200-A HART data display unit; furthermore, through this unit, it is possible to establish data communication with HART protocol smart instruments. ● It supports the standard MODBUS_RTU protocol. ● It supports a variety of smart HART protocol instruments, and allows for the customization of commands for reading such instruments. ● Equipped with 4-channel LED display for easy direct data reading. ● It has a power-off memory function, so no need to reset parameters after a power outage. 1.3 Main parameters ● Case dimensions: Length 164 mm × Width 102 mm × Height 50 mm. ● Operating ambient temperature: -20°C to +75°C. ● Relative humidity: 10%–80%. ● Power supply input voltage: DC 12～24V, or AC 220V (mains power; please specify at the time of ordering). ● Analog input impedance: 250Ω; it can acquire 4–20mA and 0–5V DC signals. ● HART protocol sampling resistor: 250Ω. 1.4 Product Selection 1.5 Product Wiring Diagram 1.6 Product Application Diagrams 1) Product Applications 2) Product Applications Department of Electronic Products, Songmao Electronics Market, Jiaxing 18757399889 Wang Yanping 2025.11.27