Seplos 48V BMS (RS485)

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

point	address (0-based)	type	scale
cell_1_voltage	1	U16	0.001
cell_2_voltage	2	U16	0.001
cell_3_voltage	3	U16	0.001
cell_4_voltage	4	U16	0.001
cell_5_voltage	5	U16	0.001
cell_6_voltage	6	U16	0.001
cell_7_voltage	7	U16	0.001
cell_8_voltage	8	U16	0.001
cell_9_voltage	9	U16	0.001
cell_10_voltage	10	U16	0.001
cell_11_voltage	11	U16	0.001
cell_12_voltage	12	U16	0.001
cell_13_voltage	13	U16	0.001
cell_14_voltage	14	U16	0.001
cell_15_voltage	15	U16	0.001
cell_16_voltage	16	U16	0.001
cell_1_temperature	18	U16	0.1
cell_2_temperature	19	U16	0.1
cell_3_temperature	20	U16	0.1
cell_4_temperature	21	U16	0.1
ambient_temperature	22	U16	0.1
components_temperature	23	U16	0.1
pack_current	24	I16	0.01
pack_voltage	25	U16	0.01
remaining_capacity	26	U16	0.01
battery_capacity	27	U16	0.01
soc	28	U16	0.1
rated_capacity	29	U16	0.01
cycle_life	30	U16	1
soh	31	U16	0.1
port_voltage	32	U16	0.01

link settings as documented (unverified): ASCII; Uses YD/T1363.3 standard-based ASCII protocol (referred to as MODBUS-ASCII in document) with SOI (~), VER, ADR, CID1, CID2, LENGTH, INFO, CHKSUM, EOI.

bench facts as documented (unverified)

terminals	RS232 and RS485
termination	120Ω
wiring notes	Asynchronous serial communication interface with 1 start bit, 8 data bits, 1 stop bit, and no parity.
broadcast	supported
protocol notes	SU sends control messages to SM through broadcast addresses. SM sends feedback to SU.

generated by gemini:gemini-3.5-flash · harvested from https://forum.iobroker.net/assets/uploads/files/1631599969177-seplos-48v-100a-bms-rs485-protocol.pdf (Seplos); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

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.
interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.