Wilo Stratos IF-Module pump

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 confirmed at the hardware-verified rung and at no rung below it.

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
set_value_holding	1	U16	0.5	%
pump_command_holding	40	U16	1
operation_mode_holding	42	U16	1
bus_command_timer	300	U16	1
set_value_input	400	U16	0.5	%
pump_command_input	402	U16	1
operation_mode_input	10	U16	1
test_register_700	700	U16	1

link settings as documented (unverified): RTU; default 9600 8E1; unit ID 1; Frame formats configurable via Parameter C (Menu 5.2.5.0). Default is 8,E,1 (Code 6).

⚠ When bus command timer state is RESET, writes from Modbus to the Setvalue, Pump command and Operation mode (holding registers 1, 40, 42) have no effect. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	marked with a (-) and b (+)
A/B polarity	a (-) and b (+)
termination	activated by setting both switches (located close to connection terminals) in the position marked with a non crossed thru resistor symbol
shield/ground	Shield shall be connected to chassis ground on both ends of the cable as a standard.
wiring notes	Characteristic impedance of the pair shall be 120 Ohm. Wiring shall be done with real shielded twisted pairs.
protocol notes	If input register 700 read fails, try 701 (offset issue).
identification notes	Software version is on a sticker close to mains terminal at Stratos series and can be read out at 4.4.2.0 for all other pump types.
accuracy	The flow value refers to clean water. Any additives may result in inaccurate or useless values.
doc revision	2014-01-03
firmware applicability	WILO Stratos series >= 5.09, WILO Stratos GIGA (all), WILO BL-E (all), WILO IP-E/DP-E >= 3.00, WILO IL-E/DL-E >= 4.00, WILO Helix EXCEL (all), WILO MVIE/MHIE/HELIX VE (1,1..4 kW) >= 3.00, WILO MVIE/HELIX VE (5,5..7,5 kW) >= 4.00

⚠ disputed: baud_rates: [9600] — disputed by Wilo Modbus IF-Module Guide, which states that multiple baud rates from 300 to 115200 bps are supported and configurable via Parameter A (Menu 5.2.4.0)

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

Depending on the Modbus master/client system, a register offset of 1 may apply. If reading input register 700 (30701) fails, users should try reading 699 or 701 to detect the offset. [source]
Some manufacturers of automation equipment use the opposite marking of A and B compared to Wilo's A(-) and B(+) terminals, which can cause RS485 communication issues. [source]
confirmed: Default baud rate is 9600, default unit ID is 1, and default framing is 8,E,1 (Code 6) — confirmed by Wilo Modbus IF-Module Guide [1.1.6]
confirmed: When bus command timer state is RESET, writes from Modbus to the Setvalue, Pump command, and Operation mode (holding registers 1, 40, 42) have no effect — confirmed by Wilo Modbus IF-Module Guide
confirmed: The flow value refers to clean water and additives may result in inaccurate or useless values — confirmed by Wilo Modbus IF-Module Guide
confirmed: Wiring terminals are marked with a (-) and b (+) and termination is activated by setting both switches to the non-crossed-thru resistor symbol — confirmed by Wilo Modbus IF-Module Guide
confirmed: If input register 700 read fails, try 701 (or 699) to detect potential register offset — confirmed by Wilo Modbus IF-Module Guide

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.

If your device isn't here, upload its register map. Generation is free, and the connector keeps the rung it earns under testing.

To prove a connector against your own device, order hardware verification. If it doesn't verify, you don't pay.

Platform builders can license the verified library: machine-readable maps, the firmware matrix, API access.