Honeywell 420-I Converter

The Honeywell 420-I Converter is a professional-grade Modbus RS-485 to 4-20mA digital-to-analog output converter designed for seamless integration into complex Building Automation Systems (BAS). This module bridges the communication gap between serial Modbus RTU networks and traditional analog field devices, providing a reliable analog output signal for proportional control. Engineered for precise signal conversion, the 420-I supports up to 127 addressed devices on a single bus, making it an essential component for technicians managing high-density BAS environments. The unit features standard 4-terminal wiring for easy installation and is built to handle the rigors of commercial HVACR applications. By utilizing this RS-485 converter, contractors can effectively control VFDs, actuators, and valves that require a standard 4-20mA current loop directly from a digital controller, ensuring precise modulation and system efficiency without the need for additional proprietary gateways.

• Precise Signal Conversion: Accurately translates Modbus RTU registers into a linear 4-20mA analog output for high-resolution device control.
• Enhanced System Scalability: Supports broad network addressing, allowing for extensive device integration across a single RS-485 serial bus.
• Industrial-Grade Reliability: Designed for continuous operation in mechanical rooms, ensuring stable performance in high-interference environments.
• Simplified Integration: Reduces field wiring complexity by allowing digital networks to drive legacy analog hardware.

How do I set the Modbus address on the Honeywell 420-I?
The device address is typically configured via onboard DIP switches or software registers, allowing the Modbus master to identify the specific converter on the loop.

Can this converter operate with a 0-10V signal?
The 420-I is specifically designed for a 4-20mA current loop; however, a 500-ohm precision resistor can be used across the output terminals to convert the signal to 2-10VDC if required by the field device.

What power supply is required for the 420-I?
The unit typically operates on a standard 24VAC/DC power source, common to most HVAC control transformer circuits.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.