Xylem Bell & Gossett pump controller

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
last_error_code	6	U16	1
parameter_index	8	U16	1
control_word_pcd	2809	U16	1
reference_pcd	2810	I16	0.006103515625
status_word_pcd	2909	U16	1
main_actual_value_pcd	2910	I16	0.006103515625
control_word	49999	U16	1
bus_reference	50009	I16	0.006103515625	%
status_word	50199	U16	1
main_actual_value	50209	I16	0.006103515625	%
power_kw	16099	U32BE	0.01	kW
motor_voltage	16119	U16	0.1	V
frequency	16129	U16	0.1	Hz
motor_current	16139	U32BE	0.01	A
speed_rpm	16169	I16	1	RPM
dc_link_voltage	16299	U16	1	V
heatsink_temp	16339	I16	1

link settings as documented (unverified): RTU; default 9600 8E1; FC 01,03,05,06,11,15,16,17

bench facts as documented (unverified)

terminals	Terminal 68, Terminal 69
A/B polarity	Terminal 68 is connected to the P signal (TX+, RX+), Terminal 69 is connected to the N signal (TX-, RX-)
termination	Resistor network at both ends, set switch S801 on the control card to 'On'
connector	Control card terminals
isolation	Galvanic isolation
shield/ground	0.25 mm2/24 AWG shielded twisted-pair cable
max registers/read	63
broadcast	supported
firmware register	15429
power	380-500 V, 525-690 V
environment	Air humidity designed to meet IEC/EN 60068-2-3, EN 50178 at 50°C. IP54/55 or IP00/IP20/TYPE 1.
doc revision	MG92B102, Rev. 2011-10-31

generated by gemini:gemini-3.5-flash · harvested from https://www.xylem.com/siteassets/brand/bell-amp-gossett/resources/manual/modbus-rtu-standard-im.pdf (Xylem); 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.