3Wire RS2S2 is a high-performance RS-485 hub designed for environments with complex electromagnetic interference.
It extends an existing RS-485 bus into two highly reliable RS-485 output interfaces, making it useful for branch networks, long-distance communication, outdoor installations and industrial control applications.
With optoelectronic isolation, 600W surge protection and up to 2,500V isolation, RS2S2 helps improve communication safety, stability and reliability.
RS-485 networks are widely used because they are simple, robust and cost-effective. However, long wiring runs, outdoor cabling, branch connections and electromagnetic interference can cause unstable communication.
RS2S2 helps strengthen RS-485 communication by providing isolated output branches with surge and ESD protection.
It is suitable for industrial automation, metering, remote monitoring, BMS, EMS, access control, alarms and other RS-485 based systems.
Extend one existing RS-485 bus into two reliable RS-485 output branches.
Improve communication reliability between controllers, meters, sensors and field devices.
Use RS2S2 to branch Modbus RTU meter networks for EMS, AMR and IoT gateway applications.
Support RS-485 communication expansion for building automation and facility monitoring systems.
External SMPS power supply helps reduce common ground interference and improves outdoor suitability.
Designed for complex electromagnetic environments where stable RS-485 communication is required.
Extends one RS-485 input bus into two output interfaces for reliable branching.
Built-in optoisolator provides up to 2,500V RMS isolation for safer communication.
Each RS-485 line is protected with 600W lightning and surge protection.
Provides strong protection against electrostatic discharge in industrial environments.
Automatically detects data flow direction and switches communication direction accordingly.
Designed to improve RS-485 communication timing and reduce delay-related issues.
RS2S2 can extend an existing RS-485 bus to two highly reliable RS-485 interfaces.
For larger systems, multiple RS2S2 hubs can be connected in parallel to expand the RS-485 network into multiple reliable interfaces. The datasheet indicates that a maximum of 128 RS-485 hubs can be connected to the RS-485 bus in parallel, depending on network design and site conditions.
485B: RS-485 - input
485A: RS-485 + input
V-: Power ground
V+: 9–40VDC input
485A1: 1ch RS-485 + output
485B1: 1ch RS-485 - output
GND: Isolated ground wire
485A2: 2ch RS-485 + output
485B2: 2ch RS-485 - output
GND: Isolated ground wire
| Parameter | RS2S2 Specification |
|---|---|
| Product Type | Dual slave isolated RS-485 hub |
| Standards | RS-485, EIA/TIA compliant |
| RS-485 Input | 4-pin terminal block |
| RS-485 Output | 6-pin terminal block with two RS-485 output channels |
| Transmission Media | Twisted-pair or shielded cable |
| Communication Mode | Asynchronous half-duplex |
| Power Supply | 9–40V DC, 500mA |
| Indicators | LED indicators for Power (PWR), Transmit (TXD) and Receive (RXD) |
| Isolation Voltage | 2,500V RMS; 500V DC with DC/DC isolation module |
| Baud Rate | 300 bps to 115.2 kbps |
| Protection Features | 600W lightning and surge protection per RS-485 line; ±15kV ESD protection |
| Transmission Distance | 0 to 3,000 meters, dependent on baud rate |
| Parallel Hub Expansion | Up to 128 RS-485 hubs can be connected to the RS-485 bus in parallel, subject to network design |
| Dimensions | 80 × 50 × 31 mm |
| Operating Temperature | –40°C to +85°C |
| Relative Humidity | 5% to 95%, non-condensing |
Use RS2S2 when one RS-485 trunk needs to be split into two reliable output branches.
Use RS2S2 in noisy industrial areas where optoelectronic isolation and surge protection can improve communication reliability.
Use RS2S2 to support RS-485 communication over longer distances, up to 3,000 meters depending on baud rate and site conditions.
3Wire RS2S2 is a dual slave isolated RS-485 hub designed to extend an existing RS-485 bus into two reliable isolated RS-485 output interfaces.
With 2,500V RMS isolation, 600W surge protection, ±15kV ESD protection, automatic data direction control, 300 bps to 115.2 kbps baud rate and up to 3,000m transmission distance, RS2S2 is suitable for demanding industrial RS-485 communication networks.
Contact 3Wire / Saturn Pyro for product selection, wiring support and RS-485 network application guidance.
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