Carlo Gavazzi EM110/111/112 (charge)
The Carlo Gavazzi EM110/111/112 and ET112 are single-phase DIN-rail energy meters used for active energy metering and load monitoring in residential and commercial electrical panels. This template connects to the EM110/111/112 or ET112 over Modbus RTU via RS485 and reads two core registers: instantaneous active power and the cumulative imported energy totalizer. Configured in charge (import) mode, the template captures consumption data only, making it well suited for EV charging sub-metering, PV self-consumption tracking, and tenant cost allocation in ModbusCloud.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 2, read only
- Brand
- Carlo Gavazzi
- Compatible models
- EM110/111/112 · ET112
- Last updated
Registers (2)
2 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power | W | Read | |||
| energy | Wh | Read |
Loading registers…
Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Monitor real-time active power draw at an EV charging circuit to verify wallbox load compliance.
- Track cumulative imported energy over billing periods to allocate consumption costs per tenant or circuit.
- Alert on sustained high power readings to detect abnormal loads or wiring faults in the panel.
- Compare daily energy totals across multiple EM110/111/112 meters on one site to identify inefficient loads.
- Verify that PV self-consumption increases over time by tracking net import energy trends in the portal.
Installation
Set the Modbus RTU slave address on the EM110/111/112 or ET112 using the front keypad or configuration menu, and configure baud rate and parity to match your RS485 network.
Wire the meter's RS485 terminals (A-, B+, GND) to the ModbusCloud Gateway in a daisy-chain or point-to-point topology; on the last device connect terminal T to terminal A- to enable the built-in termination resistor.
In the ModbusCloud portal, add a new device, import the Carlo Gavazzi EM110/111/112 (charge) template, and assign the correct Modbus unit ID matching the slave address set on the meter.
Verify the connection by reading the power register live in the portal: apply a known load on the metered circuit and confirm the displayed watt value changes accordingly.
Things to watch for
The gateway connects but power and energy read zero or no response.
Check that the Modbus slave address configured on the meter matches the unit ID set in the portal. The default address on Carlo Gavazzi EM/ET100 series meters is 1. Also confirm the baud rate and parity on the meter match the Gateway RS485 settings. A mismatch causes silent no-response timeouts.
Power values appear negative or inverted for a known load.
The EM110/111/112 and ET112 use a signed int32 with 2's complement notation. Negative power indicates export rather than import. Verify that the meter's current clamp or direct connection is oriented correctly relative to the load direction. This template targets import (charge) mode, so the CT or wiring direction must match the intended metering direction.
Energy readings seem to reset or jump unexpectedly after a power cycle.
The energy totalizer on these meters is stored in non-volatile memory and should survive a power cycle intact. Unexpected jumps may indicate a Modbus word-order issue. Carlo Gavazzi EM/ET100 registers are big-endian (MSB first); if your polling tool swaps word order, the 32-bit value will be misinterpreted. Ensure the int32 is assembled MSW then LSW.
The meter does not respond when daisy-chaining multiple devices on one RS485 bus.
Each meter on the bus must have a unique Modbus address (1 to 247). Connect terminal T to terminal A- only on the last device in the chain to insert the bus termination. Terminating mid-chain causes reflections that corrupt communication. Use a balanced AWG24 twisted-pair cable and connect the shield and GND only at the master side.
Want to see how it works?
