SunSpec 203

Firmware v2 register overview for the SunSpec 203 mapping.

Mapping behaviour

• Device Manager mapping value: 15

• Profile: SUNSPEC203

• Read function codes: FC03 and FC04

• Register widths: mixed 16-bit and 32-bit

• 32-bit word order: high word first (MSW-LSW)

• Unmapped register handling: Modbus exception

Device ID, baud rate and serial format are global firmware v2 settings. They are not changed when this mapping is selected.

Register overview

Address (decimal / hex)	Words	Type	Source or fixed value	Conversion	Missing
40000 / 0x9C40	2	uint32	constant 0x53756E53u	—	—
40002 / 0x9C42	1	uint16	constant 1	—	—
40003 / 0x9C43	1	uint16	constant 65	—	—
40004 / 0x9C44	16	text	constant "Smartstuff"	—	zero
40020 / 0x9C54	16	text	constant "P1 Modbus Pro+"	—	zero
40036 / 0x9C64	8	text	constant ""	—	zero
40044 / 0x9C6C	8	text	constant _VERSION_ONLY	—	zero
40052 / 0x9C74	16	text	constant "P1M"	—	zero
40068 / 0x9C84	1	uint16	dev_id	—	source_default
40069 / 0x9C85	1	uint16	constant 203	—	—
40070 / 0x9C86	1	uint16	constant 105	—	—
40071 / 0x9C87	1	int16	current_total_legacy_a	scale 100	zero
40072 / 0x9C88	1	int16	derived_current_l1_a	scale 100, by_direction	zero
40073 / 0x9C89	1	int16	current_l2_a	scale 100, by_direction	zero
40074 / 0x9C8A	1	int16	derived_current_l3_a	scale 100, by_direction	zero
40075 / 0x9C8B	1	int16	constant -2	—	—
40076 / 0x9C8C	1	int16	voltage_l1_v	scale 10	zero
40077 / 0x9C8D	1	int16	voltage_l2_v	scale 10	zero
40078 / 0x9C8E	1	int16	voltage_l3_v	scale 10	zero
40079 / 0x9C8F	3	uint16 fill	constant 0x8000u	—	zero
40082 / 0x9C92	1	int16	constant -1	—	—
40083 / 0x9C93	1	int16	constant 5000	—	—
40084 / 0x9C94	1	int16	constant -2	—	—
40085 / 0x9C95	1	int16	net_power_total_kw	scale 1000	zero
40086 / 0x9C96	1	int16	net_power_l1_kw	scale 1000	zero
40087 / 0x9C97	1	int16	net_power_l2_kw	scale 1000	zero
40088 / 0x9C98	1	int16	net_power_l3_kw	scale 1000	zero
40089 / 0x9C99	1	int16	constant 0	—	—
40090 / 0x9C9A	4	uint16 fill	constant 0x8000u	—	zero
40094 / 0x9C9E	1	int16	constant 0	—	—
40095 / 0x9C9F	4	uint16 fill	constant 0x8000u	—	zero
40099 / 0x9CA3	1	int16	constant 0	—	—
40100 / 0x9CA4	4	uint16 fill	constant 0x8000u	—	zero
40104 / 0x9CA8	1	int16	constant 0	—	—
40105 / 0x9CA9	2	uint32	energy_returned_total_kwh	scale 1000	zero
40107 / 0x9CAB	2	uint32	constant 0xFFFFFFFFu	—	—
40109 / 0x9CAD	2	uint32	constant 0xFFFFFFFFu	—	—
40111 / 0x9CAF	2	uint32	constant 0xFFFFFFFFu	—	—
40113 / 0x9CB1	2	uint32	energy_delivered_total_kwh	scale 1000	zero
40115 / 0x9CB3	2	uint32	constant 0xFFFFFFFFu	—	—
40117 / 0x9CB5	2	uint32	constant 0xFFFFFFFFu	—	—
40119 / 0x9CB7	2	uint32	constant 0xFFFFFFFFu	—	—
40121 / 0x9CB9	1	int16	constant 0	—	—
40122 / 0x9CBA	52	uint16 fill	constant 0xFFFFu	—	zero
40174 / 0x9CEE	2	uint32	constant 0	—	—
40176 / 0x9CF0	1	uint16	constant 0xFFFFu	—	—
40177 / 0x9CF1	1	uint16	constant 0	—	—

Reading the table

• Words is the number of consecutive 16-bit Modbus registers occupied by the entry.

• Source names correspond directly to the firmware v2 recipe source.

• Conversion records the exact scale, transform or direction handling configured by the recipe.

• This page is generated from mb_recipe.h and modbus_profiles.h for firmware 2.3.0.