```html
3Wire RS2MRC · Modbus Register Converter RS2MRC translates the replacement device’s Modbus registers into the structure already expected by your PLC, SCADA, DCS or BMS. The retrofit challenge A new meter or sensor may perform the same function as the obsolete unit, but different register addresses, function codes or scaling can force costly changes to the master system. How it works Key capabilities Map up to 150 registers from the replacement device to the addresses expected by the master. Convert between Modbus Function Codes 03H and 04H where required. Support Modbus write commands using Function Codes 06H and 10H. Apply addition, subtraction, multiplication or division to convert data values. Provide electrical isolation between master and slave RS-485 communication networks. DIN-rail or screw mounting with 12–30VDC supply and industrial operating range. Typical applications Replace obsolete power meters without changing PLC, SCADA or EMS mappings. Integrate new equipment where DCS configuration is locked or unsupported. Preserve existing BMS points, alarms and operating logic. Retain existing tags, screens and historian records during device replacement. Map replacement meter data to the addresses already configured in the master. Normalise Modbus structures before forwarding data to gateways or analytics platforms. Technical overview Final suitability depends on the existing and replacement register maps, function codes, data types, byte order and scaling requirements. Send us the existing and replacement device register maps. We will assess whether RS2MRC can eliminate PLC, SCADA, DCS or BMS modifications.
Replace the Modbus Device.
Keep the Existing System.New device. Existing register map. No costly master-system reprogramming.
150 Register mappings
03 / 04 / 06 / 10 Supported function codes
115.2 kbps Maximum baud rate
2.5 kV Signal isolation
The replacement device may be simple. Reprogramming the system is not.
Without RS2MRC
→
With RS2MRC
Preserve existing PLC logic, SCADA tags, DCS databases, BMS points, alarms, graphics and historian mappings.
A transparent bridge between the existing master and replacement device
Existing Master PLC / SCADA / DCS / BMS Sends requests using the original register structure.
→
Converter RS2MRC Maps addresses, converts function codes and scales values.
→
Field Device Replacement Modbus Device Operates using its own native register structure.
Built for industrial Modbus retrofit projects
Register Mapping
Read Conversion
Write Operations
Value Scaling
RS-485 Isolation
Industrial Installation
Where RS2MRC creates immediate value
01
Energy Meter Replacement
02
Locked DCS Systems
03
BMS Retrofits
04
SCADA Device Migration
05
Flow and BTU Meters
06
IoT and EMS Integration
Compact technical specifications
Protocol Modbus RTU
Function Codes 03H, 04H, 06H and 10H
Register Capacity Up to 150 mappings
Communication Speed 1,200–115,200 bps
Data Conversion Address, function code and value scaling
Power Supply 12–30VDC, ≤50mA
Signal Isolation 2,500Vrms
Operating Temperature -40°C to +85°C
Housing ABS UL94V0
Dimensions 100 × 54 × 32 mm
Mounting DIN rail or screw mounting
Interfaces Master and slave RS-485 ports
Replacing an obsolete Modbus device?
Malaysia
