EN
CN EN
Popular Searches

Hangzhou, May 27, 2025?— With the rapid advancement of industrial automation, stable and reliable RS-485 communication networks have become the "central nervous system" for device interconnectivity. As a domestic semiconductor company with over a decade of expertise in signal chain chips,?RuiMon Technology?upholds the principle of independent innovation and has introduced the?high-reliability auto-direction-switching half-duplex RS-485 transceiver MS2549. Its?automatic transmit/receive control technology?significantly reduces the complexity of industrial communication systems, delivering a?cost-effective domestic chip solution?for applications such as?isolated RS-485 interfaces, industrial control, and HVAC systems.

Key Features

1. Intelligent Auto-Control Design, Cost-Efficient

??Integrated auto-direction control?eliminates the need for separate receiver/transmitter switching, simplifying isolated communication design and reducing isolation component costs.

??1/4 unit load supports 128-node networking, ideal for high-density wiring scenarios like?PLCs and DCS systems.

2. Industrial-Grade Reliability

??High robustness bus pins?with?ESD protection ≥15kV (HBM).

??Hot-swap protection circuit?ensures?zero interference?during power-on/off, enhancing system stability.

3. Wide Voltage Compatibility & Flexibility

??3.3V–5.5V wide operating voltage, compatible with mainstream industrial power architectures.

??Wide common-mode input range (-7V to +12V), ensuring reliable long-line transmission in noisy environments.

?

?

Product Specifications

Key Parameters Performance
TX/RX Channels 1/1
Operating Voltage 3.3V–5.5V
Common-Mode Input Range -7V to +12V (5V); -7V to +7V (3.3V)
Receiver Threshold -50mV to +50mV
Transmission Mode Half-Duplex
ESD (Bus Pins) 15kV (HBM)
Quiescent Current 4mA
Max Data Rate 20Mbps
Bus Polarity Polarized
Package SOP8

?

?

(Typical Application Diagram)

?

Application Scenarios

The?MS2549?is designed for?RS-485 bus transmission, supporting?multi-node, half-duplex, bidirectional data communication.

Cost Advantage in Isolated 485 Solutions

Traditional isolated RS-485 designs require?three signal lines (DE, R, D)?for full data isolation. However, thanks to its?integrated auto-direction control, the?MS2549 automatically manages transmitter/receiver switching?d on bus and D-line levels,?eliminating the need for DE signal isolation. This?reduces the number of isolation components and PCB space, making it a?highly cost-effective solution for isolated RS-485 communications.

?