Dynasonics TFX Ultra ultrasonic flow meter

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
signal_strength	699	F32BE	1
flow_rate	701	F32BE	1
net_totalizer	703	F32BE	1
positive_totalizer	705	F32BE	1
negative_totalizer	707	F32BE	1
temperature_1_c	709	F32BE	1	°C
temperature_2_c	711	F32BE	1	°C
diff_temp_1_2_c	713	F32BE	1	°C
diff_temp_2_1_c	715	F32BE	1	°C
abs_diff_temp_c	717	F32BE	1	°C
temperature_1_f	719	F32BE	1	°F
temperature_2_f	721	F32BE	1	°F
diff_temp_1_2_f	723	F32BE	1	°F
diff_temp_2_1_f	725	F32BE	1	°F
abs_diff_temp_f	727	F32BE	1	°F
flow_rate_gpm	729	F32BE	1	GPM
flow_rate_lpm	731	F32BE	1	LPM
flow_rate_cfh	733	F32BE	1	CFH
flow_rate_cmh	735	F32BE	1	CMH
flow_rate_fps	737	F32BE	1	FPS
flow_rate_mps	739	F32BE	1	MPS

link settings as documented (unverified): RTU/TCP; default 9600 8N1; Baud rates up to 9600 and cable lengths to 5000 feet are supported without repeaters or end-of-line resistors.

⚠ THE POWER SUPPLY BOARD CAN HAVE LINE VOLTAGES APPLIED TO IT, SO DISCONNECT ELECTRICAL POWER BEFORE OPENING THE INSTRUMENT ENCLOSURE. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	screw-down barrier terminals
A/B polarity	RS485 B(+), RS485 A(-), RS485 Gnd
termination	without repeaters or end-of-line resistors
connector	screw-down barrier terminals, RJ connector for Ethernet, USB 2.0 Type B connector
isolation	AC-powered 4-20mA output is isolated from earth ground connections; totalizer pulse output is opto-isolated
shield/ground	connect the shield on one end to a good earth-ground connection
wiring notes	Wire gauges up to 14 AWG can be accommodated in the transmitter terminal blocks.
protocol notes	When a USB programming cable is connected, the RS485 and frequency outputs are disabled.
power	AC: 95…264 V AC 47…63 Hz @ 17 VA max. or 20…26 V AC 47…63 Hz @ 0.35 A max. DC: 10…28 V DC @ 5 W max.
environment	Ambient temperature limits –40 …185° F (–40…85° C). NEMA Type 4 (IP-65)
accuracy	DTTR/DTTN/DTTH/DTTL: ±1% of reading or ±0.01 FPS (0.003 MPS), whichever is greater
certifications	UL 61010-1, CSA C22.2 No. 61010-1, EN 61010-1, Class I Div. 2 Groups C, D, T4; Class II, Division 2, Groups F, G, T4; Class III Division 2; CE
doc revision	TTM-UM-00136-EN-08 (March 2018)

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

confirmed: comms defaults and baud rates — confirmed by TFX Ultra User Manual (TTM-UM-00136-EN-08) which lists baud rates up to 76800 (default 9600) and support for Modbus RTU and TCP
confirmed: RS485 polarity and wiring — confirmed by TFX Ultra User Manual wiring diagrams showing RS485 B(+), RS485 A(-), and RS485 Gnd
confirmed: register map addresses — confirmed by TFX Ultra User Manual Table 14 / Appendix Modbus Register Map, where 40700-40741 (0-based 699-739) represents the Floating Point Single Precision Big-Endian register map

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.