EM330 / EM340 emulation

This mapping emulates an EM330/EM340 style meter.

Defaults

• Modbus device id: 1

• RS485: 9600 8N1

• Function codes: FC03

• Data types: mixed int32 and int16

• Unavailable values: 0

Main measurement registers

Register	Description	Type	Unit / encoding
0	voltage_l1	int32	V x10
2	voltage_l2	int32	V x10
4	voltage_l3	int32	V x10
6	line_voltage_l1_l2	int32	V x10
8	line_voltage_l2_l3	int32	V x10
10	line_voltage_l3_l1	int32	V x10
12	current_l1	int32	A x1000
14	current_l2	int32	A x1000
16	current_l3	int32	A x1000
18	active_power_l1	int32	W x10
20	active_power_l2	int32	W x10
22	active_power_l3	int32	W x10
24	mirror of 18	int32	W x10
26	mirror of 20	int32	W x10
28	mirror of 22	int32	W x10
30	reactive_power_l1	int32	fixed 0
32	reactive_power_l2	int32	fixed 0
34	reactive_power_l3	int32	fixed 0
36	system_voltage_ln	int32	averaged value
38	system_voltage_ll	int32	averaged value
40	system_active_power	int32	W x10
42	system_apparent_power	int32	same as register 40
44	system_reactive_power	int32	fixed 0
46	power_factor_l1	int16	1000 or -1000
47	power_factor_l2	int16	1000 or -1000
48	power_factor_l3	int16	1000 or -1000
49	power_factor_total	int16	1000 or -1000
50	phase sequence	int16	fixed 0
51	frequency	int16	500 = 50.0 Hz
52	imported energy total	int32	kWh x10
54	imported reactive energy	int32	fixed 0
80	exported energy total	int32	kWh x10
82	exported reactive energy	int32	fixed 0
92	run hour meter	int32	seconds since boot

Configuration / info registers

Register	Description	Type	Value
406	pre4 meter flag	int32	0 or 1
408	firmware version	int32	packed MMmmpp
410	dongle name	int32	packed P1M3
0x2000	device id	int16	current DevID
0x2001	baudrate selector	int16	1-5
0x2002	parity selector	int16	1 = none, 2 = even
0x2003	stop bits	int16	1 or 2
0x2004	max words per read	int16	fixed 50

Notes

• The implementation mixes 16-bit and 32-bit registers, so clients must request registers exactly as expected by the target integration.