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RS-485 Automatic Transceiver with Isolation
The SM485M and RSM3485M are isolated, ultra‑compact RS‑485 high‑speed automatic transceiver switching modules. They provide electrical isolation between microcontrollers, ARMs, and other UART‑interface devices and the RS‑485 bus, thereby eliminating loop currents caused by ground potential differences among communication nodes, reducing noise interference, improving communication quality, and enhancing data transmission stability.
The RSM485M/RSM3485M features automatic transceiver switching control, eliminating the need for the controller to supply separate RS‑485 transmit/receive switching signals; the module autonomously toggles between transmit and receive modes based on the incoming signal. With a maximum data rate of 500 kbps and an integrated isolated DC/DC converter, it requires only a single power supply at the UART port, while the bus side needs no additional isolated power supply or external components.
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Features
● Single-input power supply (3.3V/5.0V)● Integrated DC/DC isolated power supply● Features an isolated output power supply pin● 2500 VDC isolation voltage● 500 kbps data rate● Equipped with automatic data transmission and reception capabilities● Ultra-compact size, standard DIP8 package● Extremely high electromagnetic compatibility● A single bus can connect up to 64 nodes.● Operating temperature range: -40°C to +85°CApplication
● Industrial Automation● Battery Management System● New Energy● Building Automation● Power Monitoring● Coal mines and oilfieldsSelection
Product model Power Supply Voltage (V) Baud rate (kbps) Quiescent Current (mA) Maximum current (mA) Maximum number of nodes RSM3485M3.3(3.15-3.45)5002210064RSM485M5.0(4.75-5.25)500209064 -
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