3Wire RS2M2 is a 2-channel isolated RS-485 hub that allows two RS-485 master devices to communicate with one or more RS-485 slave devices without cross-interference.
It ensures that responses from slave devices are sent only to the corresponding master that initiated the request, improving communication control in multi-master RS-485 environments.
RS2M2 is suitable for industrial automation, remote monitoring, alarm systems, access control and other RS-485 control applications.
In many RS-485 networks, one master communicates with many slave devices. But some sites require two master devices, such as a PLC and monitoring system, to access the same RS-485 slave network.
Without proper isolation and communication control, multi-master communication can create collision, interference and unreliable responses.
This makes RS2M2 useful where the same RS-485 device network must be shared between control, monitoring, automation, metering or supervisory systems.
Allow PLCs, controllers and monitoring systems to access RS-485 slave devices with better communication separation.
Supports master-slave protocols such as Modbus for industrial metering and control systems.
Share RS-485 digital power meters between automation systems and energy monitoring platforms.
Useful where BMS, EMS or SCADA systems need access to the same RS-485 slave device network.
Suitable for RS-485 based alarm systems, access control networks and site monitoring systems.
Supports RS-485 communication sharing for remote monitoring and control applications.
Allows two RS-485 master devices to communicate with one or more slave devices.
Responses from slave devices are sent only to the master that initiated the request.
Supports master-slave protocols such as Modbus and similar RS-485 communication systems.
Each communication port can be configured independently for baud rate and communication format.
The slave communication port supports connection to multiple slave devices.
Each of the three communication ports includes LED indication for real-time monitoring.
Provides robust signal integrity and helps protect communication circuits from electrical disturbance.
Signal interface includes anti-static protection for industrial RS-485 environments.
Built-in anti-lightning and anti-surge protection helps safeguard connected systems.
DC 9–30V input with built-in overcurrent and reverse polarity protection.
Complete electrical isolation between communication and power, plus full isolation between master and slave interfaces.
Built with a 32-bit microcontroller and high-speed optocouplers for stable performance.
RS2M2 includes three RS-485 communication interfaces:
RS-485 Master 1 interface for the first master device.
RS-485 Master 2 interface for the second master device.
RS-485 slave interface for one or more connected slave devices.
| Parameter | RS2M2 Specification |
|---|---|
| Product Type | Dual master isolated RS-485 hub |
| Master Interfaces | MA1 and MA2 for RS-485 master devices |
| Slave Interface | SLA for RS-485 slave devices |
| Communication Type | Master-slave protocols, including Modbus and similar protocols |
| Data Transmission | Transparent transmission |
| Baud Rate | 1200 bps to 115200 bps; default 9600 bps |
| Communication Format | Stop bit, bit length and parity can be configured |
| Slave Node Capacity | Supports multiple slave devices; slave port supports up to 175 nodes depending on network conditions |
| Protection Level | RS-485 interface protection with 600W surge protection and ±15kV ESD protection |
| Electrical Isolation | Communication and power isolation; master and slave interface isolation |
| Power Input | DC 9–30V |
| Minimum Required Current | ≥100mA |
| Maximum Voltage Limit | Do not exceed 35V |
| Power Protection | Built-in reverse polarity protection and overcurrent protection |
| Processor Architecture | 32-bit microcontroller with high-speed optocouplers |
| Status Indicators | LED indicators for communication ports and status monitoring |
Connect VCC to the positive terminal of the DC 9–30V power supply and GND to the negative terminal.
Connect terminal A to the RS-485 A line, terminal B to the RS-485 B line, and GND to signal ground where required.
The SET terminal/button is used for configuration setting as part of the RS2M2 interface arrangement.
3Wire RS2M2 is a dual master isolated RS-485 hub designed to allow two RS-485 master devices to communicate with one or more slave devices while reducing cross-interference.
With photoelectric isolation, 15kV ESD protection, 5kA lightning surge protection, independent port configuration, transparent transmission and DC 9–30V power input, RS2M2 is suitable for industrial automation, metering, access control, alarms and remote monitoring applications.
Contact 3Wire / Saturn Pyro for product selection, wiring support and RS-485 communication application guidance.
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