Why do all register readings show zero or garbage values?

Socomec meters publish their register map in JBus addressing. Depending on your Modbus client configuration, a +1 offset may apply. Confirm the ModbusCloud Gateway is using zero-based addressing, which matches the addresses in this template. Also verify the unit ID set on the meter matches the ID configured in the portal.

32-bit values look wrong or byte-swapped. What is the cause?

Socomec DIRIS and Countis meters encode 32-bit registers in Big Endian word order: the most significant word occupies the lower address. If your integration layer swaps words, disable any word-swap option in the ModbusCloud Gateway settings to restore correct values.

The gateway connects but no data appears for variant B or C registers. Why?

This template covers three register address groups (A, B, C) that correspond to different meter models or firmware generations auto-detected by OpenEMS. If your specific meter only populates one group, the other address ranges will return exceptions or zeros. Check which Socomec model you have and confirm its documented register base address matches the active group.

Meter is reachable by ping but Modbus TCP polling times out. How do I fix this?

Check that Modbus TCP is explicitly enabled in the meter's communication settings, not just the Ethernet interface. Some Socomec models require Modbus TCP to be activated separately from the network configuration. Also confirm no switch ACL or VLAN separation exists between the Gateway and the meter on port 502.

Free Modbus template: Socomec Threephase

Name: Socomec Threephase
Brand: Socomec
SKU: cb237276-2c17-4580-bbfd-bc1e1e70f13c

The Socomec Threephase template targets Socomec three-phase energy meters, including Countis and DIRIS series models, used for grid metering in commercial buildings, industrial facilities, and energy management systems. Over Modbus TCP, this template reads per-phase voltage, current, active power, and reactive power for all three phases, plus aggregate current and voltage, grid frequency, and cumulative consumption and production energy across three register variants (A, B, and C) that cover different meter firmware generations. Connecting one template to your ModbusCloud Gateway gives you a complete electrical picture of the monitored circuit without manual register lookup.

Registers (37)

37 read / 0 write

Name	Address	Function	Type	Unit	Access
voltage_l1_a Phase L1 line-to-neutral voltage, variant A register set.	50520	FC03	uint32	V	R
voltage_l2_a Phase L2 line-to-neutral voltage, variant A register set.	50522	FC03	uint32	V	R
voltage_l3_a Phase L3 line-to-neutral voltage, variant A register set.	50524	FC03	uint32	V	R
frequency AC grid frequency in hertz, typically 50 or 60.	50526	FC03	uint32	Hz	R
current_l1_a Phase L1 current in amperes, variant A register set.	50528	FC03	uint32	A	R
current_l2_a Phase L2 current in amperes, variant A register set.	50530	FC03	uint32	A	R
current_l3_a Phase L3 current in amperes, variant A register set.	50532	FC03	uint32	A	R
active_power_a Total three-phase active power in watts, variant A.	50536	FC03	int32	W	R
reactive_power_a Total three-phase reactive power in var, variant A.	50538	FC03	int32	var	R
active_power_l1_a Phase L1 active power in watts, variant A register set.	50544	FC03	int32	W	R
active_power_l2_a Phase L2 active power in watts, variant A register set.	50546	FC03	int32	W	R
active_power_l3_a Phase L3 active power in watts, variant A register set.	50548	FC03	int32	W	R
reactive_power_l1_a Phase L1 reactive power in watts units, variant A.	50550	FC03	int32	W	R
reactive_power_l2_a Phase L2 reactive power in watts units, variant A.	50552	FC03	int32	W	R
reactive_power_l3_a Phase L3 reactive power in watts units, variant A.	50554	FC03	int32	W	R
current Average or total three-phase current in amperes.	50568	FC03	uint32	A	R
voltage Average or total three-phase voltage in volts.	50572	FC03	uint32	V	R
active_consumption_energy_a Cumulative active energy consumed in watt-hours, variant A.	50946	FC03	uint32	Wh	R
active_production_energy_a Cumulative active energy exported in watt-hours, variant A.	50952	FC03	uint32	Wh	R
active_consumption_energy_b Cumulative active energy consumed in watt-hours, variant B.	50780	FC03	uint32	Wh	R
active_production_energy_b Cumulative active energy exported in watt-hours, variant B.	50786	FC03	uint32	Wh	R
voltage_l1_b Phase L1 line-to-neutral voltage, variant B register set.	18444	FC03	uint32	V	R
voltage_l2_b Phase L2 line-to-neutral voltage, variant B register set.	18446	FC03	uint32	V	R
voltage_l3_b Phase L3 line-to-neutral voltage, variant B register set.	18448	FC03	uint32	V	R
current_l1_b Phase L1 current in amperes, variant B register set.	18458	FC03	uint32	A	R
current_l2_b Phase L2 current in amperes, variant B register set.	18460	FC03	uint32	A	R
current_l3_b Phase L3 current in amperes, variant B register set.	18462	FC03	uint32	A	R
active_power_b Total three-phase active power in watts, variant B.	18476	FC03	int32	W	R
reactive_power_b Total three-phase reactive power in var, variant B.	18478	FC03	int32	var	R
active_power_l1_b Phase L1 active power in watts, variant B register set.	18488	FC03	int32	W	R
active_power_l2_b Phase L2 active power in watts, variant B register set.	18490	FC03	int32	W	R
active_power_l3_b Phase L3 active power in watts, variant B register set.	18492	FC03	int32	W	R
reactive_power_l1_b Phase L1 reactive power in watts units, variant B.	18494	FC03	int32	W	R
reactive_power_l2_b Phase L2 reactive power in watts units, variant B.	18496	FC03	int32	W	R
reactive_power_l3_b Phase L3 reactive power in watts units, variant B.	18498	FC03	int32	W	R
active_consumption_energy_c Cumulative active energy consumed in watt-hours, variant C.	19843	FC03	uint32	Wh	R
active_production_energy_c Cumulative active energy exported in watt-hours, variant C.	19846	FC03	uint32	Wh	R