Original CSP CSR70 isolated serial communication module, for industrial control system serial data conversion.

Product Overview

CSR70 is CSP industrial isolated serial communication module, widely used for legacy power plant and industrial control systems. It realizes signal conversion and galvanic isolation between host system and field serial devices, supports RS232 / RS422 / RS485 multi‑serial standard, processes Modbus RTU transparent transmission data, eliminates ground‑loop interference in cabinet environment. Compact metal housing, widely used as maintenance spare part for DCS, turbine and generator control cabinets.

Key Features

• Supports selectable RS‑232 / RS‑422 / RS‑485 serial interface
• Full galvanic isolation, suppresses common‑mode noise and ground‑loop interference
• Supports Modbus RTU / ASCII and transparent serial transmission
• On‑board LED indicators for communication link and fault status
• DIN‑rail modular installation for industrial control cabinet

• Low power consumption, stable for long‑term 24‑hour continuous operation

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Technical Specifications

• Brand: CSP (Cegelec legacy)
• Model: CSR70
• Module Type: Serial Communication Module
• Power Supply: 9‑36VDC nominal 24VDC
• Interface: RS‑232 / RS‑422 / RS‑485
• Protocol: Modbus RTU, transparent serial
• Baud Rate: 300bps‑115.2kbps
• Isolation Voltage: 2500V DC
• Operating Temp: ‑20℃ ~ +60℃
• Storage Temp: ‑40℃ ~ +85℃
• Humidity: 5‑95% non‑condensing

• Installation: 35mm DIN‑rail mounting

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Compatibility

Compatible with industrial control equipment with serial communication requirement. Power supply check, serial parameter matching and communication test are required after replacement.