Rosemount 8732EM mag flow transmitter

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
status_register_0	0	U16	1
status_register_1	1	U16	1
status_register_2	2	U16	1
flow_rate	200	F32BE	1	ft/s
totalizer_a_value	202	F32BE	1	gal
totalizer_b_value	204	F32BE	1	gal
totalizer_c_value	206	F32BE	1	gal
electronics_temperature_value	208	F32BE	1	°F
line_noise_value	210	F32BE	1	mV
snr_5hz	212	F32BE	1
snr_37hz	214	F32BE	1
signal_power	216	F32BE	1
empty_pipe_value	218	F32BE	1
electrode_coating_value	220	F32BE	1	kΩ
electrode_resistance_value	224	F32BE	1	Ω
coil_resistance_value	226	F32BE	1	Ω
coil_inductance_value	228	F32BE	1
coil_current	236	F32BE	1	mA

link settings as documented (unverified): RTU; default 19200 8E1; unit ID 1; Modbus RS-485 output. Transmitters with a Modbus output provide an RS-485 signal to a Modbus host system; data rates can be configured from 1200 baud to 115.2 kilobaud.

bench facts as documented (unverified)

terminals	Terminal 1: Modbus (B), Terminal 2: Modbus (A). Terminal block screws: 6-32 (No. 6) suitable for up to 14 AWG wire.
A/B polarity	Modbus (A) and Modbus (B)
termination	Typically 120 ohms.
connector	Terminal block
isolation	Galvanically isolated frequency signal (for pulse). Modbus output circuit is internally powered (Active): Outputs up to 3.3 VDC, 100 mA, 100 mW.
shield/ground	Safety grounding screws: External stainless assembly, M5; internal 8-32 (No. 8).
wiring notes	Conduit entries available in 1/2 inch NPT or M20.
protocol notes	Minimum response delay is used to synchronize Modbus communications with hosts that operate at a slower speed than the transmitter. This value can be configured as an integer from 0 to 250 ms. The default value is 10 ms.
model register	120
serial register	151
firmware register	16
identification notes	Register 120 is Manufacturers Device Type Code, Register 121 is Manufacturers Id Code, Register 151 is Device Identification Number, Register 153 is Primary Variable Sensor Serial Number, Register 16 is Transmitter software revision.
power	AC power: 90–250 VAC, 0.45 A, 40 VA; Standard DC power: 12–42 VDC, 1.2 A, 15 W; Low power DC: 12–30 VDC, 0.25 A, 4 W
environment	Ingress protection: IP66, IP69. NEMA 4X. Pollution Degree 2. Operating temperature: -58 to 140 °F (-50 to 60 °C) without LOI/Display, -4 to 140 °F (-20 to 60 °C) with LOI/Display. Humidity: 0-95% RH to 140 °F (60 °C).
accuracy	0.25% Standard 0.15% High Accuracy Option
certifications	Rosemount 8700M Approval Document - IECEx and ATEX, Class Division, North America Zone, NEPSI EN Zone 1 China
doc revision	00809-0400-4444, Rev AC, August 2024
firmware applicability	4.4 software or later

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

confirmed: Modbus RS-485 output with configurable baud rates from 1200 to 115200 (default 19200), default unit ID 1, and Even parity with 1 stop bit — confirmed by Rosemount 8732EM Transmitter with Modbus Protocol Reference Manual (00809-0400-4444)
confirmed: Terminal block connections with Terminal 1 as Modbus (B) and Terminal 2 as Modbus (A) — confirmed by Rosemount 8732EM Transmitter with Modbus Protocol Reference Manual (00809-0400-4444)
confirmed: Register map 0-based addresses (e.g., flow_rate @ 200, totalizer_a_value @ 202, electronics_temperature_value @ 208, empty_pipe_value @ 218) — confirmed by Rosemount 8732EM Transmitter with Modbus Protocol Reference Manual (00809-0400-4444) which lists these at 1-based registers 201, 203, 209, and 219 respectively

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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