The Honeywell 2MLL‑C42B is a dual-channel RS‑422 serial interface module for use with ML200 / ML200R PLCs. Featuring two isolated serial ports, it enables secure, stable communication with external serial devices using protocols like Modbus RTU.

Its industrial-grade build and conformal coating ensure durability in demanding environments, making it an ideal solution for SCADA integration, legacy serial device support, and data acquisition applications. Designed for seamless installation into the MasterLogic‑200 PLC system architecture.

Key Features and Specifications

• Part Number: 2MLL‑C42B

• Communication Ports: 2 isolated RS‑422 serial channels

• Protocol Support: Supports serial protocols such as Modbus RTU

• Voltage Isolation: Electrical isolation between channels and system bus

• Compatible With: Honeywell MasterLogic‑200 (ML200) and ML200R PLCs

• Application: Integrates legacy serial devices, HMI systems, or SCADA

• Build: Conformal-coated, compact module suitable for harsh environments

• Country of Origin: South Korea

• Weight: ~160 g