Vega VEGAPULS C 21 radar level sensor

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	unit
status	100	U16	1
pv_unit	104	U16	1
sv_unit	108	U16	1
tv_unit	112	U16	1
qv_unit	116	U16	1
pv_be	2002	F32BE	1
sv_be	2004	F32BE	1
tv_be	2006	F32BE	1
qv_be	2008	F32BE	1
pv_le	2102	F32LE	1
sv_le	2104	F32LE	1
tv_le	2106	F32LE	1
qv_le	2108	F32LE	1
measured_distance	2303	F32BE	1	m
absolute_echo_amplitude	2305	F32BE	1	dB
signal_quality	2314	F32BE	1	dB
filling_height	2316	F32BE	1	m
current_diagnostic_code	2300	U32BE	1
device_status	2307	U16	1

link settings as documented (unverified): RTU/ASCII; default 9600 8N1; unit ID 246; FC 03,04,06,08,16,17,43; Levelmaster protocol is also supported.

bench facts as documented (unverified)

terminals	Brown: Voltage supply (+), Blue: Voltage supply (-), Black: Modbus D+, White: Modbus D-, Shielding
A/B polarity	Black is D+ (Plus), White is D- (Minus)
termination	Make sure that the bus is terminated with suitable terminating resistors.
connector	Fixed cable
isolation	Electronics potential free up to 500 V AC
shield/ground	We recommend to connect the cable screening to ground potential at one end on the supply side when using shielded cable.
max registers/read	127
inter-frame delay	50 ms
serial register	2308
FC 43 device ID	supported
power	8 ... 30 V DC, Power consumption without/with bus communication typ. at 12 DC: 150 mW/330 mW, 24 V DC: 240 mW/420 mW
environment	Ambient temperature -40 ... +80 °C, Process temperature -40 ... +80 °C, Process pressure -1 ... 3 bar, Protection rating IP66/IP68 (3 bar, 24 h)
accuracy	Non-repeatability <= 2 mm, Temperature drift - Digital output < 3 mm/10 K, max. 5 mm
certifications	Class 4M8 acc. to IEC 60721-3-4, Class 6M4 acc. to IEC 60721-3-6, IK07 acc. to IEC 62262, IEC 60332-1-2, UL 1581
doc revision	Editing status: 2024-11-13, Document ID: 58343

generated by gemini:gemini-3.5-flash · harvested from https://www.instrumart.com/assets/VEGAPULS-C-21-Modbus-manual.pdf (Vega); 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.