Chint CPS SCA-M string inverter

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
phase_a_voltage	4097	U16	0.1	0.1V
phase_a_current	4098	U16	0.01	0.01A
phase_a_power	4099	U32BE	0.1	0.1W
phase_a_frequency	4101	U16	0.01	0.01Hz
phase_b_voltage	4102	U16	0.1	0.1V
phase_b_current	4103	U16	0.01	0.01A
phase_b_power	4104	U32BE	0.1	0.1W
phase_b_frequency	4106	U16	0.01	0.01Hz
phase_c_voltage	4107	U16	0.1	0.1V
phase_c_current	4108	U16	0.01	0.01A
phase_c_power	4109	U32BE	0.1	0.1W
phase_c_frequency	4111	U16	0.01	0.01Hz
pv1_voltage	4112	U16	0.1	0.1V
pv1_current	4113	U16	0.01	0.01A
mppt1_power	4114	U32BE	0.1	0.1W
pv2_voltage	4116	U16	0.1	0.1V
pv2_current	4117	U16	0.01	0.01A
mppt2_power	4118	U32BE	0.1	0.1W
pv3_voltage	4120	U16	0.1	0.1V
pv3_current	4121	U16	0.01	0.01A
mppt3_power	4122	U32BE	0.1	0.1W
inner_temperature	4124	I16	1	1°C
inverter_mode	4125	U16	1
error_code	4126	U32BE	1
total_energy	4129	U32BE	1	kWh
total_generation_time	4131	U32BE	1	Hour
today_energy	4135	U32BE	1	wh
active_power	4151	U32BE	0.1	0.1W
reactive_power	4153	U32BE	0.1	0.1Var
today_peak_power	4155	U32BE	0.1	0.1W
power_factor	4157	I16	0.001	0.001
pv4_voltage	4158	U16	0.1	0.1V
pv4_current	4159	U16	0.01	0.01A
mppt4_power	4160	U32BE	0.1	0.1W

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 03,06,16; Modbus communication adopts 2-line RS-485 interface, half duplex, and a single host can connect up to 247 inverters.

bench facts as documented (unverified)

terminals	2-line RS-485 interface
wiring notes	D+ and D- connections
max registers/read	124
broadcast	supported
model register	0x1A00
serial register	0x1A10
firmware register	0x1A1C
doc revision	V4.16

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

The inverter replies with inverted endianness (swapped word order) on all 32-bit responses. [source]
confirmed: Modbus Protocol V4.16 is the official document version for Chint CPS SCA-M string inverters — confirmed by Chint product documentation and download listings [1.3.4].
confirmed: Comms defaults (9600 baud, 8-N-1, default unit ID 1, RTU framing, half-duplex RS-485) — confirmed by Chint Modbus Protocol V4.16 and Sunvec Modbus Protocol specifications.
confirmed: Identification registers (model @ 0x1A00, serial @ 0x1A10, firmware @ 0x1A1C) — confirmed by Chint Modbus Protocol V4.16 and V4.21 specifications.
confirmed: Register map summary (e.g., phase_a_voltage @ 4097, pv1_voltage @ 4112, total_energy @ 4129, active_power @ 4151) — confirmed by Chint Modbus Protocol V4.21 Overview.
confirmed: Quirks (broadcast address 0 supported, max read registers of 124) — confirmed by Chint Modbus Protocol V4.16 and V4.21 specifications.
confirmed: Physical terminals (RS-485 A/D+ and B/D- connections) — confirmed by Reduxi integration guide for Chint CPS string inverters.

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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