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 a-TroniX controllers and converters. Match the 'A' and 'B' from the meter (see table above) to the 'A' and 'B' on your controller.
| Device | a-TroniX Controller model OM1 | a-TroniX 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: