Supported Devices
| Device Type | Modbus TCP (Ethernet) | RS485 |
|---|---|---|
| Carlo Gavazzi EM330 | ❌ | ✅ |
| Carlo Gavazzi EM340 |
Wiring
RS485
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 | MidTeq EMS model OM1 | MidTeq EMS model IG8 | RS485-USB converter | RS485-Ethernet converter |
|---|---|---|---|---|
| RS485 A | RS485_POS | RS485 A | TX+ | |
| RS485 B | RS485_NEG | RS485 B | TX- | |
| 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 MidTeq EMS will find them faster!
- For each device, it is generally recommended to stick with the factory default baud rate, parity, and stop bits. The MidTeq EMS will scan on those first.
Set the Modbus address through the power meter's “Address” configuration menu.
