
Supported Devices
Device Type | Modbus TCP (Ethernet) | RS485 |
---|---|---|
Schneider-Electric IEM 3150 | ❌ | ✅ |
Schneider-Electric IEM 3155 | ||
Schneider-Electric IEM 3250 | ||
Schneider-Electric IEM 3255 | ||
Schneider-Electric IEM 3350 | ||
Schneider-Electric IEM 3355 | ||
Schneider-Electric IEM 3455 | ||
Schneider-Electric IEM 3555 |
warning
Not all Schneider-Electric IEM 3000 series energy meters register exported energy! Check with the energy meter manufacturer if in doubt. At least IEM 3150, IEM 3250 and IEM 3350 do not allow reading out exported energy.

Wiring
RS485 Wiring
- For correct RS485 wiring: Follow the guidelines for RS485 wiring.
- If the wiring shown in the table below is incorrect, please let us know.
- There is no general consensus in the industry about the usage of A and B for the RS485 polarity, so it may be counterintuitive and opposite of what you might expect for some devices.
Device | SmartgridOne Controller model OM1 | SmartgridOne Controller model IG8 | RS485-USB converter | RS485-Ethernet converter |
---|---|---|---|---|
D1 | RS485 A | RS485_POS | RS485 A | TX+ |
D0 | RS485 B | RS485_NEG | RS485 B | TX- |
0V | RS GND | GND | Not available | G |

Configuration
NOTE: RS485 Device Addresses
- You MUST give each device on the RS485 bus a unique address. Check the manual of the device on how to do this.
- Use lower addresses first (1, 2, ...) because the SmartgridOne Controller will find them faster!
- For each device, it is generally recommended to stick with the factory default baud rate, parity, and stop bits. The SmartgridOne Controller will scan on those first.
Check the device manual on how to enter the energy meter's configuration menu.

