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1.1 Product Overview The SM100-T-B-4 multi-variable current output converter is a high-tech device that integrates the HART protocol and RS485 communication capabilities, along with multiple variable current output options. It is based on a high-end ARM microcontroller, and consists of interface chips, hardware watchdog circuits, etc.; it also incorporates a HART modem chip, offering features such as stable performance and high cost-effectiveness. The structural design of the SM100-T-B-4 multi-variable current output converter 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 ● It features one RS485 interface that supports the standard MODBUS_RTU communication protocol; parameters can also be configured. ● It comes with dedicated configuration software that enables data communication with HART protocol smart instruments. ● It features 4 current outputs, enabling current-based transmission of HART variables. ● Supports a single HART protocol smart instrument. ● Supports various special HART protocol smart meters. ● It has a power-off memory function, so no need to reset parameters after a power outage. 1.3 Main parameters ● Installation dimensions: Length 134 mm × Width 71 mm × Height 43 mm. ● Operating environment temperature: -20°C to +80°C. ● Storage temperature: -25°C to +80°C. ● Power supply input voltage: DC 12～24V. ● HART protocol sampling resistor: 250Ω. 1.4 Product wiring diagram 2.2.1 Two-wire instrument wiring diagram 2.2.2 Four-wire instrument wiring diagram 1.5 Product application diagram Wang Yanping, Marketing Department, Jiaxing Songmao Electronics Market 18757399889 2025.12.26