Senva EM energy meter

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
Reset Reason	102	U16	1
Reset Count	103	U16	1
Up Time	104	U32BE	1	s
Identify Meter	111	U16	1
Auto Protocol	112	U16	1
Auto Baud Rate	114	U16	1
Auto Parity	116	U16	1
Auto Data Bits	117	U16	1
Auto Stop Bits	118	U16	1
RS485 Protocol	122	U16	1
Slave Address	123	U16	1
RS485 Baud Rate	124	U32BE	1
RS485 Parity	126	U16	1
RS485 Data Bits	127	U16	1
RS485 Stop Bits	128	U16	1
Temperature Units	133	U16	1
Smoothed Temperature Response Time	134	U16	1	s
Smoothed Frequency Response Time	142	U16	1	s
Smoothed Voltage Response Time	144	U16	1	s
System Current Sensor Technology	152	U16	1
Angle Units	153	U16	1
Smoothed Current Response Time	154	U16	1	s
System Phase Selection	161	U16	1
Power Spectrum	162	U16	1
Power Units	163	U16	1
Smoothed Power Response Time	164	U16	1	s
Energy Data Type	170	U16	1
Energy Units	173	U16	1
Energy Timestamp	174	F32BE	1	ms
Demand Window Synchronization	181	U16	1
Demand Window Time	183	U16	1	minutes
Elapsed Demand Window	184	U32BE	1	minutes
Demand Window Count	186	U32BE	1
Reset Meter Configuration	190	U32BE	1
Reset Meter Statistics	192	U32BE	1
Energy Reset Count	194	U16	1
Auto Reset Statistics	195	U16	1
Setup Button	200	U16	1
Binary Input 1	201	U16	1
Binary Input 2	202	U16	1
Pulse Input Debounce Time	208	U16	1	ms
Pulse Input 1 Count	210	U32BE	1
Pulse Input 1 Active Elapsed Time	212	U32BE	1	s
Pulse Input 1 Preset	216	U32BE	1
Pulse Input 1 Count Before Preset	218	U32BE	1
Pulse Input 2 Count	220	U32BE	1
Pulse Input 2 Active Elapsed Time	222	U32BE	1	s
Pulse Input 2 Preset	226	U32BE	1
Pulse Input 2 Count Before Preset	228	U32BE	1
PowerPrint Alarm	240	U16	1
PowerPrint Active	241	U16	1
PowerPrint Frequency	242	F32BE	1	Hz
PowerPrint Frequency Tolerance	244	F32BE	1	Hz
PowerPrint Voltage Tolerance	246	F32BE	1	%
PowerPrint Voltage Angle Tolerance	248	F32BE	1	°
Location String	276	U16	1
User Data	292	U16	1
Temperature	310	F32BE	1
Temperature Instantaneous	312	F32BE	1
Temperature Minimum	314	F32BE	1
Temperature Maximum	316	F32BE	1
Temperature Average	318	F32BE	1
Power Supply Voltage	380	F32BE	1	V
Power Supply Voltage Instantaneous	382	F32BE	1	V
Power Supply Voltage Minimum	384	F32BE	1	V
Power Supply Voltage Maximum	386	F32BE	1	V
Power Supply Voltage Average	388	F32BE	1	V
Active Conditions	400	U16	1
Previous Conditions	401	U16	1
Line Frequency	410	F32BE	1	Hz
Line Frequency Instantaneous	412	F32BE	1	Hz
Line Frequency Minimum	414	F32BE	1	Hz
Line Frequency Maximum	416	F32BE	1	Hz
Line Frequency Average	418	F32BE	1	Hz
Phase Average RMS Voltage	420	F32BE	1	V
Phase Average RMS Voltage Instantaneous	422	F32BE	1	V
Phase Average RMS Voltage Minimum	424	F32BE	1	V
Phase Average RMS Voltage Maximum	426	F32BE	1	V
Phase Average RMS Voltage Average	428	F32BE	1	V
Phase to Phase Average RMS Voltage	450	F32BE	1	V
Phase to Phase Average RMS Voltage Instantaneous	452	F32BE	1	V
Phase to Phase Average RMS Voltage Minimum	454	F32BE	1	V
Phase to Phase Average RMS Voltage Maximum	456	F32BE	1	V
Phase to Phase Average RMS Voltage Average	458	F32BE	1	V
Phase Average RMS Current	520	F32BE	1	A
Phase Average RMS Current Instantaneous	522	F32BE	1	A
Phase Average RMS Current Minimum	524	F32BE	1	A
Phase Average RMS Current Maximum	526	F32BE	1	A
Phase Average RMS Current Average	528	F32BE	1	A
Phase Average Current Angle	540	F32BE	1
Phase Average Current Angle Instantaneous	542	F32BE	1
Phase Average Current Angle Minimum	544	F32BE	1
Phase Average Current Angle Maximum	546	F32BE	1
Phase Average Current Angle Average	548	F32BE	1
System Power Factor	550	F32BE	1
System Power Factor Instantaneous	552	F32BE	1
System Power Factor Minimum	554	F32BE	1
System Power Factor Maximum	556	F32BE	1
System Power Factor Average	558	F32BE	1
Total Real Power	600	F32BE	1
Total Real Power Instantaneous	602	F32BE	1
Total Real Power Minimum	604	F32BE	1
Total Real Power Maximum	606	F32BE	1
Total Real Power Average	608	F32BE	1
Phase Average Real Power	610	F32BE	1
Phase Average Real Power Instantaneous	612	F32BE	1
Phase Average Real Power Minimum	614	F32BE	1
Phase Average Real Power Maximum	616	F32BE	1
Phase Average Real Power Average	618	F32BE	1
Net Real Power	620	F32BE	1
Net Real Power Instantaneous	622	F32BE	1
Net Real Power Minimum	624	F32BE	1
Net Real Power Maximum	626	F32BE	1
Net Real Power Overall Average	628	F32BE	1
Net Real Power Import Average	630	F32BE	1
Net Real Power Export Average	632	F32BE	1
Total Reactive Power	640	F32BE	1
Total Reactive Power Instantaneous	642	F32BE	1
Total Reactive Power Minimum	644	F32BE	1
Total Reactive Power Maximum	646	F32BE	1
Total Reactive Power Average	648	F32BE	1
Phase Average Reactive Power	650	F32BE	1
Phase Average Reactive Power Instantaneous	652	F32BE	1
Phase Average Reactive Power Minimum	654	F32BE	1
Phase Average Reactive Power Maximum	656	F32BE	1
Phase Average Reactive Power Average	658	F32BE	1
Total Apparent Power	660	F32BE	1
Total Apparent Power Instantaneous	662	F32BE	1
Total Apparent Power Minimum	664	F32BE	1
Total Apparent Power Maximum	666	F32BE	1
Total Apparent Power Average	668	F32BE	1
Phase Average Apparent Power	670	F32BE	1
Phase Average Apparent Power Instantaneous	672	F32BE	1
Phase Average Apparent Power Minimum	674	F32BE	1
Phase Average Apparent Power Maximum	676	F32BE	1
Phase Average Apparent Power Average	678	F32BE	1
Total Real Energy	700	F32BE	1
Total Real Energy Import	702	F32BE	1
Total Real Energy Export	704	F32BE	1
Total Real Energy Net	706	F32BE	1
System Real Energy	720	F32BE	1
System Real Energy Import	722	F32BE	1
System Real Energy Export	724	F32BE	1
Total Reactive Energy	740	F32BE	1
Total Reactive Energy Import	742	F32BE	1
Total Reactive Energy Export	744	F32BE	1
Total Apparent Energy	760	F32BE	1
Total Apparent Energy Import	762	F32BE	1
Total Apparent Energy Export	764	F32BE	1
Demand Real Power	800	F32BE	1
Demand Real Power Previous	802	F32BE	1
Demand Real Power Minimum	804	F32BE	1
Demand Real Power Maximum	806	F32BE	1
Demand System Real Power	820	F32BE	1
Demand System Real Power Previous	822	F32BE	1
Demand System Real Power Minimum	824	F32BE	1
Demand System Real Power Maximum	826	F32BE	1
Demand Reactive Power	840	F32BE	1
Demand Reactive Power Previous	842	F32BE	1
Demand Reactive Power Minimum	844	F32BE	1
Demand Reactive Power Maximum	846	F32BE	1
Demand Apparent Power	860	F32BE	1
Demand Apparent Power Previous	862	F32BE	1
Demand Apparent Power Minimum	864	F32BE	1
Demand Apparent Power Maximum	866	F32BE	1
Phase Sensor Serial Number	1010	U16	1
Phase Sensor Model	1020	U16	1
Present	1102	U16	1
Status	1103	U16	1
PowerPrint Identity Status	1104	U16	1
Voltage Rating	1140	F32BE	1	V
Voltage Multiplier	1142	F32BE	1
PowerPrint Voltage	1144	F32BE	1	V
PowerPrint Voltage Angle	1146	F32BE	1	°
Current Rating	1150	F32BE	1	A
Current Multiplier	1152	F32BE	1
Current Sensor Technology	1154	U16	1
Power Multiplier Override	1161	U16	1
Power Multiplier	1162	F32BE	1
Statistics Reset	1192	U32BE	1
Active Conditions	1400	U16	1
Previous Conditions	1401	U16	1
Phase RMS Voltage	1420	F32BE	1	V
Phase RMS Voltage Instantaneous	1422	F32BE	1	V
Phase RMS Voltage Minimum	1424	F32BE	1	V
Phase RMS Voltage Maximum	1426	F32BE	1	V
Phase RMS Voltage Average	1428	F32BE	1	V
Phase to Phase Voltage Angle	1440	F32BE	1	°
Phase to Phase Voltage Angle Instantaneous	1442	F32BE	1	°
Phase to Phase Voltage Angle Minimum	1444	F32BE	1	°
Phase to Phase Voltage Angle Maximum	1446	F32BE	1	°
Phase to Phase Voltage Angle Average	1448	F32BE	1	°
Phase to Phase RMS Voltage	1450	F32BE	1	V
Phase to Phase RMS Voltage Instantaneous	1452	F32BE	1	V
Phase to Phase RMS Voltage Minimum	1454	F32BE	1	V
Phase to Phase RMS Voltage Maximum	1456	F32BE	1	V
Phase to Phase RMS Voltage Average	1458	F32BE	1	V
Phase RMS Current	1520	F32BE	1	A
Phase RMS Current Instantaneous	1522	F32BE	1	A
Phase RMS Current Minimum	1524	F32BE	1	A
Phase RMS Current Maximum	1526	F32BE	1	A
Phase RMS Current Average	1528	F32BE	1	A
Phase Current Angle	1540	F32BE	1	°
Phase Current Angle Instantaneous	1542	F32BE	1	°
Phase Current Angle Minimum	1544	F32BE	1	°
Phase Current Angle Maximum	1546	F32BE	1	°
Phase Current Angle Average	1548	F32BE	1	°
Phase Power Factor	1550	F32BE	1
Phase Power Factor Instantaneous	1552	F32BE	1
Phase Power Factor Minimum	1554	F32BE	1
Phase Power Factor Maximum	1556	F32BE	1
Phase Power Factor Average	1558	F32BE	1
Phase Real Power	1600	F32BE	1
Phase Real Power Instantaneous	1602	F32BE	1
Phase Real Power Minimum	1604	F32BE	1
Phase Real Power Maximum	1606	F32BE	1
Phase Real Power Overall Average	1608	F32BE	1
Phase Real Power Import Average	1610	F32BE	1
Phase Real Power Export Average	1612	F32BE	1
Phase Reactive Power	1640	F32BE	1
Phase Reactive Power Instantaneous	1642	F32BE	1
Phase Reactive Power Minimum	1644	F32BE	1
Phase Reactive Power Maximum	1646	F32BE	1
Phase Reactive Power Overall Average	1648	F32BE	1
Phase Reactive Power Import Average	1650	F32BE	1
Phase Reactive Power Export Average	1652	F32BE	1
Phase Apparent Power	1660	F32BE	1
Phase Apparent Power Instantaneous	1662	F32BE	1
Phase Apparent Power Minimum	1664	F32BE	1
Phase Apparent Power Maximum	1666	F32BE	1
Phase Apparent Power Overall Average	1668	F32BE	1
Phase Apparent Power Import Average	1670	F32BE	1
Phase Apparent Power Export Average	1672	F32BE	1
Total Phase Real Energy	1700	F32BE	1
Total Phase Real Energy Import	1702	F32BE	1
Total Phase Real Energy Export	1704	F32BE	1
Total Phase Real Energy Net	1706	F32BE	1
Total Phase Reactive Energy	1740	F32BE	1
Total Phase Reactive Energy Import	1742	F32BE	1
Total Phase Reactive Energy Export	1744	F32BE	1
Total Phase Apparent Energy	1760	F32BE	1
Total Phase Apparent Energy Import	1762	F32BE	1
Total Phase Apparent Energy Export	1764	F32BE	1
Demand Real Power	1800	F32BE	1
Demand Real Power Previous	1802	F32BE	1
Demand Real Power Minimum	1804	F32BE	1
Demand Real Power Maximum	1806	F32BE	1
Demand Reactive Power	1840	F32BE	1
Demand Reactive Power Previous	1842	F32BE	1
Demand Reactive Power Minimum	1844	F32BE	1
Demand Reactive Power Maximum	1846	F32BE	1
Demand Apparent Power	1860	F32BE	1
Demand Apparent Power Previous	1862	F32BE	1
Demand Apparent Power Minimum	1864	F32BE	1
Demand Apparent Power Maximum	1866	F32BE	1

link settings as documented (unverified): RTU/ASCII; baud 1200/2400/4800/9600/19200/38400/57600/115200/230400/460800; FC 03,06,08,16,17; Supports automatic baud rate, parity, data bits, and protocol detection.

bench facts as documented (unverified)

terminals	POWER, GND, A (+), COM, B (-)
A/B polarity	A (+), B (-)
max registers/read	125
broadcast	supported
protocol notes	Responds to global address 255 (0xFF) on dedicated networks.
identification notes	Supports 0x11 Report Server ID which returns Vendor Name, Model Name, Serial Number, Firmware Version, and Location String.
FC 43 device ID	not supported
power	12.0 VDC minimum for full operation
doc revision	0A

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

The meter supports reads from the complete Modbus address space (registers 0 to 65535) without error, including undefined addresses, returning dummy data for undefined addresses to facilitate combining reads from non-adjacent registers. [source]
confirmed: Baud rates [1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800] — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) which lists support for baud rates 1200 to 460800
confirmed: Framing ['RTU', 'ASCII'] — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) which states support for automatic protocol detection of Modbus RTU and ASCII
confirmed: Function codes [3, 6, 8, 16, 17] — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) which lists support for 0x03 (Read Holding Registers), 0x06 (Write Single Register), 0x08 (Diagnostics), 0x10 (Write Multiple Registers), and 0x11 (Report Server ID)
confirmed: Polarity 'A (+), B (-)' and terminals 'POWER, GND, A (+), COM, B (-)' — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) wiring diagram
confirmed: Power '12.0 VDC minimum for full operation' — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) which states the meter requires 12.0 VDC minimum for full operation
confirmed: Broadcast supported and global address 255 (0xFF) — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) which states the meter responds to global address 255 (0xFF) on dedicated networks
confirmed: Max read registers 125 — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) which specifies R = 1 to 125 registers for read operations
confirmed: Register map summary (temperature @ 310, power_supply_voltage @ 380, active_conditions @ 400, line_frequency @ 410, phase_average_rms_voltage @ 420, phase_to_phase_average_rms_voltage @ 450, phase_average_rms_current @ 520, phase_average_current_angle @ 540, system_power_factor @ 550, r_phase_active_conditions @ 1400, r_phase_rms_voltage @ 1420, r_phase_to_phase_voltage_angle @ 1440, r_phase_to_phase_rms_voltage @ 1450, r_phase_rms_current @ 1520, r_phase_current_angle @ 1540, r_phase_power_factor @ 1550, r_phase_real_power @ 1600, r_phase_reactive_power @ 1640, r_phase_apparent_power @ 1660, r_phase_total_real_energy @ 1700, r_phase_total_reactive_energy @ 1740, r_phase_total_apparent_energy @ 1760, r_phase_demand_real_power @ 1800, r_phase_demand_reactive_power @ 1840) — confirmed by Senva EM-RS485 Modbus Protocol Guide (154-0023-0B) register listings

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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