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Easy Usage Guide for HART Smart Converters 1.1 Product Introduction The SM101-W series of HART smart converters are products developed using ARM microprocessors, specialized chips for HART protocol modulation/demodulation, as well as extensive practical experience. It is designed in accordance with the requirements for industrial products, offering high reliability and stability. The intelligent converter is equipped with a standard RS485 interface and a gateway, enabling transparent data transmission with smart instruments that use the HART protocol, or converting the data to MODBUS_RTU/MODBUS_TCP format for reading, thus ensuring real-time data transmission. The HART protocol uses the Bell202 Frequency Shift Keying (FSK) standard, superimposing a modulated digital signal on the 4–20mA signal; this allows HART-enabled instruments to enable two-way data communication without interfering with the 4–20mA analog signal. The SM101 series of smart converters are intelligent converters that enable bidirectional modulation and demodulation between digital signals and analog signals. 1.2 Product Features ● Equipped with a standard RS485 communication interface and gateway, 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 increasing the operating speed of the entire system. ● It uses an industrially standard modular housing, facilitating installation and debugging. ● It is equipped with dedicated configuration software that allows for parameter setting of the SM101 series of intelligent converters; furthermore, these converters enable data communication with HART protocol smart instruments. ● It supports the standard MODBUS_RTU and MODBUS_TCP protocols. ● It supports connecting multiple HART protocol smart instruments simultaneously. ● Each HART channel is isolated from one another, without affecting the instrument’s current output. ● It supports a variety of smart instruments with special HART protocols, and allows for the customization of commands for reading such instruments. ● The data update time is 0.8 seconds for 1 device; if 4 devices are connected, it takes 3.2 seconds to update all the data at once. ● Installation method: It can be installed on standard tracks or fixed in place. 1.3 Main parameters ● Power supply input voltage: DC 12～24V; the ripple of the power supply shall not exceed 200mA, and 100mA of current must be provided. ● Case dimensions: Length 75 mm × Width 80 mm × Height 41 mm. ● Operating ambient temperature: -20°C to +80°C. ● Relative humidity: 10% to 80%. 1.4 Product wiring diagram 1.5 Product model list 1.6 Product application diagrams Manager Wang from the Marketing Department of Jiaxing Songmao Electronics: 18757399889, December 24, 2025