SDM630 emulation

This mapping emulates an Eastron SDM630 style meter.

Defaults

• Modbus device id: 1

• Baudrate: 9600

• Function codes: FC03 and FC04

• Data format: mainly float32

Important note

• The code comment describes the SDM630 default serial mode as 8N1.

• In p1m.h, the current SDM630 build is configured as SERIAL_8E1.

• If you publish this page, it is worth deciding which one should be considered the intended default.

FC04 - measurement registers

Register	Description	Unit / encoding
0	voltage_l1	V
2	voltage_l2	V
4	voltage_l3	V
6	current_l1	A
8	current_l2	A
10	current_l3	A
12	active_power_l1	W
14	active_power_l2	W
16	active_power_l3	W
24	reactive_power_l1	mirrored from active power sign/value logic
26	reactive_power_l2	mirrored from active power sign/value logic
28	reactive_power_l3	mirrored from active power sign/value logic
30	power_factor_l1	1.0 or -1.0
32	power_factor_l2	1.0 or -1.0
34	power_factor_l3	1.0 or -1.0
48	total_current	A
52	total_active_power	W
60	total_reactive_power	mirrored from total active power sign/value logic
62	total_power_factor	1.0 or -1.0
70	frequency	50.0 Hz
72	import_energy_active	kWh
74	export_energy_active	kWh
200	line_voltage_l1_l2	V
202	line_voltage_l2_l3	V
204	line_voltage_l3_l1	V
342	total_energy_sum	kWh = import + export
406	pre4 meter flag	integer-like float
408	firmware version	packed MMmmpp as raw 32-bit
410	dongle name	packed P1M3

FC03 - holding / configuration style registers

Register	Description	Value
0x00	demand time	42
0x02	demand period	60
0x04	relay pulse width	0
0x06	network parity stop	220
0x08	meter id mirror	5
0x0A	baud mirror	3
0x0C	p1 output mode	200
0x12	stop/parity config	currently fixed 0
0x14	device id	current DevID
0x16	pulse per tick	1
0x18	password / pin code	1000
0x1C	baud selector	0-4 based on current baudrate
0x56	output config	39
0xF010	reset max demand	0
0xFC00	serial number	fixed 22502976

Notes

• Registers are implemented exactly as used by the emulation code; this is not a full SDM630 register map.

• With NEGATIEF enabled, the sign of active and reactive power is inverted.