eTactica Power Meter EM

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
Vendor id	8192	U16	1
Product id	8193	U16	1
Firmware version	8194	U16	1
Serial number bytes 0..1	8195	U16	1
Serial number bytes 2..3	8196	U16	1
Serial number bytes 4..5	8197	U16	1
Command	8198	U16	1
Total register count	8199	U16	1
Serial communication settings	8200	U16	1
Modbus slave ID	8201	U16	1
CPU Temperature	8206	I16	0.01	°C
Frequency	8207	U16	0.001	Hz
current phase 1	8208	U32BE	0.001	A
current phase 2	8210	U32BE	0.001	A
current phase 3	8212	U32BE	0.001	A
voltage phase 1	8214	U32BE	0.001	V
voltage phase 2	8216	U32BE	0.001	V
voltage phase 3	8218	U32BE	0.001	V
Power factor phase 1	8222	I16	0.01
Power factor phase 2	8223	I16	0.01
Power factor phase 3	8224	I16	0.01
Status	8225	U16	1
Nominal full-scale amperage of current sensor	8226	U16	1	A
cumulative milli Watt hours	8232	I64BE	0.001	Wh
cumulative milli var hours	8239	I64BE	0.001	varh
CPU Temperature	8448	I16	0.01	°C
Cumulative micro Watt hours	8449	I64BE	0.000001	Wh
Cumulative micro var hours	8453	I64BE	0.000001	varh
RMS Voltage in mV – phase 1 – 1 second average	8457	U32BE	0.001	V
RMS Voltage in mV – phase 2 – 1 second average	8459	U32BE	0.001	V
RMS Voltage in mV – phase 3 – 1 second average	8461	U32BE	0.001	V
RMS Current in mA – phase 1 – 1 second average	8463	U32BE	0.001	A
RMS Current in mA – phase 2 – 1 second average	8465	U32BE	0.001	A
RMS Current in mA – phase 3 – 1 second average	8467	U32BE	0.001	A
Power factor phase 1 – 1 second average	8469	I16	0.0001
Power factor phase 2 – 1 second average	8470	I16	0.0001
Power factor phase 3 – 1 second average	8471	I16	0.0001
Frequency in milli Hz	8472	U16	0.001	Hz
Active In micro Watt Hours – phase 1	8473	U64BE	0.000001	Wh
Active In micro Watt Hours – phase 2	8477	U64BE	0.000001	Wh
Active In micro Watt Hours – phase 3	8481	U64BE	0.000001	Wh
Active Out micro Watt Hours – phase 1	8485	U64BE	0.000001	Wh
Active Out micro Watt Hours – phase 2	8489	U64BE	0.000001	Wh
Active Out micro Watt Hours – phase 3	8493	U64BE	0.000001	Wh
Reactive In micro VAr hours – phase 1	8497	U64BE	0.000001	varh
Reactive In micro VAr hours – phase 2	8501	U64BE	0.000001	varh
Reactive In micro VAr hours – phase 3	8505	U64BE	0.000001	varh
Reactive Out micro VAr hours – phase 1	8509	U64BE	0.000001	varh
Reactive Out micro VAr hours – phase 2	8513	U64BE	0.000001	varh
Reactive Out micro VAr hours – phase 3	8517	U64BE	0.000001	varh
RMS Voltage in mV – phase 1 – 60 second average	8521	U32BE	0.001	V
RMS Voltage in mV – phase 2 – 60 second average	8523	U32BE	0.001	V
RMS Voltage in mV – phase 3 – 60 second average	8525	U32BE	0.001	V
RMS Current in mA – phase 1 – 60 second average	8527	U32BE	0.001	A
RMS Current in mA – phase 2 – 60 second average	8529	U32BE	0.001	A
RMS Current in mA – phase 3 – 60 second average	8531	U32BE	0.001	A
Power factor phase 1 – 60 second average	8533	I16	0.0001
Power factor phase 2 – 60 second average	8534	I16	0.0001
Power factor phase 3 – 60 second average	8535	I16	0.0001
RMS Voltage in mV – phase 1 – last line cycle	8536	U32BE	0.001	V
RMS Voltage in mV – phase 2 – last line cycle	8538	U32BE	0.001	V
RMS Voltage in mV – phase 3 – last line cycle	8540	U32BE	0.001	V
RMS Current in mA – phase 1 – last line cycle	8542	U32BE	0.001	A
RMS Current in mA – phase 2 – last line cycle	8544	U32BE	0.001	A
RMS Current in mA – phase 3 – last line cycle	8546	U32BE	0.001	A
Power factor phase 1 – latest value	8548	I16	0.0001
Power factor phase 2 – latest value	8549	I16	0.0001
Power factor phase 3 – latest value	8550	I16	0.0001
Sign of power factor phase 1	8551	I16	1
Sign of power factor phase 2	8552	I16	1
Sign of power factor phase 3	8553	I16	1

link settings as documented (unverified): RTU; default 19200 8E1; FC 03,16; RS485 half-duplex. Default settings: 19200 baud, 8 data bits, Even parity, 1 stop bit. Configurable in firmware 3.2 or higher.

bench facts as documented (unverified)

terminals	RS485 half-duplex
wiring notes	EM-SC uses split-core current sensors, EM-FC uses flexible-coil current sensors
response timeout	4 ms
protocol notes	Typically, the device will respond in 3-4 milliseconds. There is no limit on back to back requests.
model register	0x2001
serial register	0x2003
firmware register	0x2002
doc revision	2.1
firmware applicability	EM2 extended registers require firmware version 4.0 or greater. Serial settings configurable in firmware 3.2 or higher.

field reports — community-sourced, unverified (checked 2026-06-11)

confirmed: Default serial settings: 19200 baud, 8 data bits, Even parity, 1 stop bit — confirmed by eTactica EM-SC/FC Modbus Register Map document [1.1.1] and product data sheet
confirmed: Baud rates supported: 600 to 115200 — confirmed by eTactica EM-SC/FC Modbus Register Map document (register 0x2008)
confirmed: EM-SC uses split-core current sensors, EM-FC uses flexible-coil current sensors — confirmed by eTactica PowerSync Network Product Data Sheet
confirmed: EM2 extended registers require firmware version 4.0 or greater — confirmed by eTactica EM-SC/FC Modbus Register Map document
confirmed: Typically, the device will respond in 3-4 milliseconds — confirmed by eTactica EM-SC/FC Modbus Register Map document
confirmed: Register addresses (e.g., cpu_temperature_common @ 8206, frequency @ 8207, current_phase_1 @ 8208, etc.) — confirmed by eTactica EM-SC/FC Modbus Register Map document

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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