ABB Energy Meters
| Device Type | Modbus TCP (Ethernet) | RS485 |
|---|---|---|
| ABB B21 | ❌ | ✅ |
| ABB B23 | ||
| ABB B24 |
The ABB B-series meters (B21, B23, B24) use a 3-pole RS485 connection. Connect these to the Controller as follows, based on the meter's terminal markings.
This table shows the terminals on the meter itself.
| Signal | Terminal Number |
|---|---|
| A | 37 |
| B | 36 |
| C (GND) | 35 |
IMPORTANT: Troubleshooting
The 'A' and 'B' labels are not universally standardized. If the Controller cannot find the device during a scan, it is often due to a wiring mismatch.
Swap the A and B wires (between the controller and the meter) and try scanning again.
This table shows the corresponding RS485 pins on SmartgridOne controllers and converters. Match the 'A' and 'B' from the meter (see table above) to the 'A' and 'B' on your controller.
| Device | SmartgridOne Controller model OM1 | SmartgridOne Controller model IG8 | RS485-USB converter | RS485-Ethernet converter |
|---|---|---|---|---|
| A | RS485 A | RS485_POS | RS485 A | TX+ |
| B | RS485 B | RS485_NEG | RS485 B | TX- |
| N/A | RS GND | GND | Not available | G |
Use the following Modbus settings in the Controller's device wizard. These are the default settings for the meter: