DevicesEnergy meter
Chint Energy Meters
Supported Devices
| Device Type | Variants | Modbus TCP (Ethernet) | RS485 |
|---|---|---|---|
| DDSU666 | 230V-5/80A 230V-100A/40mA | ✅ | ✅ |
| DTSU666 | 3x230V/400V-5/80A 3x230V/400V-1.5(6)A 3x230V/400V-100A/40mA | ||
| DTSU666HW | |||
| DTSU666-20 | ❌ |
Connection
The communication between the SmartgridOne and the energy meter operates via an RS-485 serial bus or Modbus TCP.
It is recommended to use shielded cables with twisted pairs for optimal performance. For short distances, a twisted pair from a network cable (minimum CAT5e) can be used.
The following guidelines apply:
- Maximum Distance: The total cable length, including the main cable and branches, is limited to 100 meters.
- Connecting Multiple Energy Meters: The cable should be daisy-chained from meter to meter or branched off the main cable (branches must not exceed 1 meter).
- Long Distances: It is recommended to install a 120Ω termination resistor at the end of the main cable and activate the termination resistor on the SmartgridOne Controller.
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 |
|---|---|---|---|---|
| Terminal 24 | RS485 A | RS485_POS | RS485 A | TX+ |
| Terminal 25 | RS485 B | RS485_NEG | RS485 B | TX- |
| N/A | RS GND | GND | Not available | G |
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.