Technical Specifications Communication Port Quantity: 4 independent serial ports Interface Standard: RS‑232 / RS‑422 / RS‑485 configurable per port Supported Protocols: Modbus RTU Master / Slave, SNP‑X, Serial I/O Data Transmission Rate: 300‑115200 baud rate configurable Backplane Interface: RX3i high‑speed backplane bus Operating Power: Supplied via RX3i rack backplane Operating Temperature: ‑40 ℃ to +70 ℃ Storage Temperature: ‑50 ℃ to +85 ℃ Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Single‑slot module for RX3i rack Certifications: CE, UL industrial component compliance
Functional Features Four independent serial communication channels with configurable hardware interface standard. Supports Modbus RTU master and slave mode for connecting numerous third‑party devices. Realizes high‑speed data interaction with RX3i CPU through backplane bus. Front‑panel LED indicators show communication port running status.
Application Scenarios Serial data connection for industrial field instruments and transmitters. Communication interface for variable‑frequency drives and motor control equipment. Modbus RTU networking for chemical and process automation sites. 
Structural Characteristics Standard single‑slot plug‑in structure matching RX3i rack specification. Front‑panel LED status lamps for each communication channel. Front‑mounted terminal block for serial signal wiring. Backplane golden‑finger interface for bus data and power supply access.
Working Principle After receiving configuration parameters from RX3i CPU via backplane bus, the module completes protocol parsing for each serial channel. It receives serial data from field connected devices, converts data format and uploads effective information to CPU.
Installation Requirements Insert the module into designated slot of RX3i standard rack. Follow system grounding specification to complete rack protective grounding. Field serial cables adopt shielded twisted‑pair wires; separate signal wiring from high‑power cables. Confirm interface hardware mode and baud‑rate setting match connected field devices before power‑on. Hot‑swap replacement must comply with on‑site industrial safety operation procedure. Ambient operating environment shall stay within defined temperature and humidity range without condensed moisture.
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