All register values appear as zero or NaN. What is wrong?

The most common cause is a slave address mismatch. The DRT428M2 ships with a default address that may differ from what is set in the portal. Check the address configured on the meter via the front-panel menu and ensure it matches the unit ID assigned to the template in ModbusCloud. Also verify baud rate and parity match on both sides.

Energy counters keep showing the same value and never update.

The DRT428M2 energy registers (addresses 256 onward) are float32 values stored across two consecutive holding registers. If your gateway or polling tool is reading only one register word instead of two, the value will appear frozen or incorrect. Confirm the template is using float32 (two-register) reads with function code 3 and that no byte-swap override is active.

Reactive power and energy values seem incorrect or inverted.

The DRT428M2 tracks forward and reverse reactive energy separately. If the meter's wiring direction is reversed (supply entering from the bottom instead of the top), import and export will be swapped. Verify wiring polarity: supply must enter from the top terminals. Also confirm the total calculation mode is set correctly on the meter for your application (import-only, export-only, or import plus export).

The RS485 bus works with one meter but drops out when I add a second.

Each meter on the RS485 bus must have a unique slave address. Duplicate addresses cause bus collisions and intermittent timeouts for all devices. Also check that termination resistors are fitted only at the two physical ends of the bus, not at intermediate nodes. Reduce the polling rate if the bus cable is long or if more than four meters share the segment.

Free Modbus template: BGE-TECH DRT428M2

Name: BGE-TECH DRT428M2
Brand: BGE-TECH
SKU: fbe22c9b-6720-4015-864e-a5269f4eb899

The BGE-TECH DRT428M2 is a three-phase DIN-rail energy meter designed for sub-metering in commercial, industrial, and building-automation applications. Using Modbus RTU over RS485, this template reads per-phase voltage, current, active power, reactive power, apparent power, and power factor. It also collects bidirectional energy totals: forward and reverse active and reactive energy for each phase, plus four independent tariff registers (T1 to T4) for time-of-use analysis. Connecting the DRT428M2 to the ModbusCloud Gateway gives installers and facility managers continuous visibility into load balance, energy import and export, and tariff-period consumption without manual meter reads.

Registers (71)

71 read / 0 write

Name	Address	Function	Type	Unit	Access
voltage_l1 Phase L1 line-to-neutral voltage, in volts.	14	FC03	float32	V	R
voltage_l2 Phase L2 line-to-neutral voltage, in volts.	16	FC03	float32	V	R
voltage_l3 Phase L3 line-to-neutral voltage, in volts.	18	FC03	float32	V	R
frequency Grid frequency, in hertz, typically 50 or 60.	20	FC03	float32	Hz	R
current_l1 Phase L1 current draw, in amperes.	22	FC03	float32	A	R
current_l2 Phase L2 current draw, in amperes.	24	FC03	float32	A	R
current_l3 Phase L3 current draw, in amperes.	26	FC03	float32	A	R
active_power Total three-phase active power, in watts.	28	FC03	float32	W	R
active_power_l1 Phase L1 active power, in watts.	30	FC03	float32	W	R
active_power_l2 Phase L2 active power, in watts.	32	FC03	float32	W	R
active_power_l3 Phase L3 active power, in watts.	34	FC03	float32	W	R
reactive_power Total three-phase reactive power, in var.	36	FC03	float32	var	R
reactive_power_l1 Phase L1 reactive power component, in var.	38	FC03	float32	W	R
reactive_power_l2 Phase L2 reactive power component, in var.	40	FC03	float32	W	R
reactive_power_l3 Phase L3 reactive power component, in var.	42	FC03	float32	W	R
total_apparent_power Total three-phase apparent power, in VA.	44	FC03	float32	W	R
l1_apparent_power Phase L1 apparent power, in VA.	46	FC03	float32	W	R
l2_apparent_power Phase L2 apparent power, in VA.	48	FC03	float32	W	R
l3_apparent_power Phase L3 apparent power, in VA.	50	FC03	float32	W	R
total_power_factor Overall three-phase power factor, dimensionless.	52	FC03	float32		R
l1_power_factor Phase L1 power factor, dimensionless.	54	FC03	float32		R
l2_power_factor Phase L2 power factor, dimensionless.	56	FC03	float32		R
l3_power_factor Phase L3 power factor, dimensionless.	58	FC03	float32		R
total_active_energy Cumulative total active energy, all phases, watt-hours.	256	FC03	float32	Wh	R
l1_total_active_energy Cumulative total active energy for phase L1, watt-hours.	258	FC03	float32	Wh	R
l2_total_active_energy Cumulative total active energy for phase L2, watt-hours.	260	FC03	float32	Wh	R
l3_total_active_energy Cumulative total active energy for phase L3, watt-hours.	262	FC03	float32	Wh	R
forward_active_energy Cumulative imported (forward) active energy, all phases, watt-hours.	264	FC03	float32	Wh	R
l1_forward_active_energy Cumulative imported active energy for phase L1, watt-hours.	266	FC03	float32	Wh	R
l2_forward_active_energy Cumulative imported active energy for phase L2, watt-hours.	268	FC03	float32	Wh	R
l3_forward_active_energy Cumulative imported active energy for phase L3, watt-hours.	270	FC03	float32	Wh	R
reverse_active_energy Cumulative exported (reverse) active energy, all phases, watt-hours.	272	FC03	float32	Wh	R
l1_reverse_active_energy Cumulative exported active energy for phase L1, watt-hours.	274	FC03	float32	Wh	R
l2_reverse_active_energy Cumulative exported active energy for phase L2, watt-hours.	276	FC03	float32	Wh	R
l3_reverse_active_energy Cumulative exported active energy for phase L3, watt-hours.	278	FC03	float32	Wh	R
total_reactive_energy Cumulative total reactive energy, all phases, var-hours.	280	FC03	float32	Wh	R
l1_reactive_energy Cumulative total reactive energy for phase L1, var-hours.	282	FC03	float32	Wh	R
l2_reactive_energy Cumulative total reactive energy for phase L2, var-hours.	284	FC03	float32	Wh	R
l3_reactive_energy Cumulative total reactive energy for phase L3, var-hours.	286	FC03	float32	Wh	R
forward_reactive_energy Cumulative imported (forward) reactive energy, all phases, var-hours.	288	FC03	float32	Wh	R
l1_forward_reactive_energy Cumulative imported reactive energy for phase L1, var-hours.	290	FC03	float32	Wh	R
l2_forward_reactive_energy Cumulative imported reactive energy for phase L2, var-hours.	292	FC03	float32	Wh	R
l3_forward_reactive_energy Cumulative imported reactive energy for phase L3, var-hours.	294	FC03	float32	Wh	R
reverse_reactive_energy Cumulative exported (reverse) reactive energy, all phases, var-hours.	296	FC03	float32	Wh	R
l1_reverse_reactive_energy Cumulative exported reactive energy for phase L1, var-hours.	298	FC03	float32	Wh	R
l2_reverse_reactive_energy Cumulative exported reactive energy for phase L2, var-hours.	300	FC03	float32	Wh	R
l3_reverse_reactive_energy Cumulative exported reactive energy for phase L3, var-hours.	302	FC03	float32	Wh	R
t1_total_active_energy Total active energy accumulated under tariff period T1, watt-hours.	304	FC03	float32	Wh	R
t1_forward_active_energy Imported active energy under tariff period T1, watt-hours.	306	FC03	float32	Wh	R
t1_reverse_active_energy Exported active energy under tariff period T1, watt-hours.	308	FC03	float32	Wh	R
t1_total_reactive_energy Total reactive energy accumulated under tariff period T1, var-hours.	310	FC03	float32	Wh	R
t1_forward_reactive_energy Imported reactive energy under tariff period T1, var-hours.	312	FC03	float32	Wh	R
t1_reverse_reactive_energy Exported reactive energy under tariff period T1, var-hours.	314	FC03	float32	Wh	R
t2_total_active_energy Total active energy accumulated under tariff period T2, watt-hours.	316	FC03	float32	Wh	R
t2_forward_active_energy Imported active energy under tariff period T2, watt-hours.	318	FC03	float32	Wh	R
t2_reverse_active_energy Exported active energy under tariff period T2, watt-hours.	320	FC03	float32	Wh	R
t2_total_reactive_energy Total reactive energy accumulated under tariff period T2, var-hours.	322	FC03	float32	Wh	R
t2_forward_reactive_energy Imported reactive energy under tariff period T2, var-hours.	324	FC03	float32	Wh	R
t2_reverse_reactive_energy Exported reactive energy under tariff period T2, var-hours.	326	FC03	float32	Wh	R
t3_total_active_energy Total active energy accumulated under tariff period T3, watt-hours.	328	FC03	float32	Wh	R
t3_forward_active_energy Imported active energy under tariff period T3, watt-hours.	330	FC03	float32	Wh	R
t3_reverse_active_energy Exported active energy under tariff period T3, watt-hours.	332	FC03	float32	Wh	R
t3_total_reactive_energy Total reactive energy accumulated under tariff period T3, var-hours.	334	FC03	float32	Wh	R
t3_forward_reactive_energy Imported reactive energy under tariff period T3, var-hours.	336	FC03	float32	Wh	R
t3_reverse_reactive_energy Exported reactive energy under tariff period T3, var-hours.	338	FC03	float32	Wh	R
t4_total_active_energy Total active energy accumulated under tariff period T4, watt-hours.	340	FC03	float32	Wh	R
t4_forward_active_energy Imported active energy under tariff period T4, watt-hours.	342	FC03	float32	Wh	R
t4_reverse_active_energy Exported active energy under tariff period T4, watt-hours.	344	FC03	float32	Wh	R
t4_total_reactive_energy Total reactive energy accumulated under tariff period T4, var-hours.	346	FC03	float32	Wh	R
t4_forward_reactive_energy Imported reactive energy under tariff period T4, var-hours.	348	FC03	float32	Wh	R
t4_reverse_reactive_energy Exported reactive energy under tariff period T4, var-hours.	350	FC03	float32	Wh	R