USB HART Modem – USB Powered HART Protocol Converter with Built-in 24V Loop Power, 250Ω Resistor

M100-C(III) HART Modem is a high-performance, USB-powered intelligent converter designed for industrial automation and field instrument diagnostics. With its built-in isolated 24V power supply, integrated 250Ω resistor, and USB interface support, the SM100-C(III) offers a reliable and compact solution for configuring, calibrating, and maintaining HART field devices. Ideal for engineers and technicians needing portable and efficient field communication.Model: SM100-C (III) Communication Interface: USB Power Supply: USB Bus-powered (DC 5V / 30mA) Output Power: Built-in isolated 24VDC Resistor: Integrated 250Ω precision resistor Protocol Compatibility: Fully supports HART standard protocol Case Dimensions: 71 × 52 × 22 mm (2.8 × 2.0 × 0.9 in) Operating Temperature: -20℃ to +80℃ Humidity Range: 10% ~ 80% RH (non-condensing) USB Cable Length: 48 cm Test Wire Length: 50 cm (red & black leads) Wiring Modes: 250Ω / None / 24V + 250Ω Indicator Lights:   - POW: Solid when powered   - TXD: Flashes on data transmission   - RXD: Flashes on data reception

• Dual Communication Modes: USB and Wi-Fi serial port switching with hardware dial.
• Built-In 24V Loop Power Supply: Directly powers two-wire HART devices.
• Integrated 250Ω Resistor: No external resistor needed during communication tests.
• Full HART Compatibility: Communicates with any standard HART-enabled field instrument.
• High Stability: Designed for industrial environments with excellent EMC and vibration resistance. LED Indicators: Power (POW), Transmit (TXD), and Receive (RXD) status lights.