Magnetrol Eclipse 706 level 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
pv_value	1302	F32BE	1
sv_value	1304	F32BE	1
tv_value	1306	F32BE	1
qv_value	1308	F32BE	1
pv_units_code	104	U16	1
sv_units_code	108	U16	1
tv_units_code	112	U16	1
qv_units_code	116	U16	1
blocking_distance	3100	F32BE	1	Level Units
level_unit_code	2140	U16	1
level_offset	3102	F32BE	1	Level Units
sensitivity	3131	U16	1
level_threshold_amplitude	3134	U16	1
interface_threshold_amplitude	3135	U16	1

link settings as documented (unverified): RTU/ASCII; default 9600 8E1; unit ID 247; FC 03,04,06,16; Setting DIP switch position 1 to OFF configures the HMA to communicate via Modbus RTU with default settings: 9600 baud, 8 data bits, even parity, 1 stop bit, address 247.

bench facts as documented (unverified)

terminals	RS-485 terminal block (TB2) with Receive/Transmit Data+ A and Receive/Transmit Data- B. TB2 is also used for RS-232 when DIP switches 3 and 4 are set to RS-232 mode.
A/B polarity	A connects to '-' position, B connects to '+' position
termination	120 Ohm resistor between the two RS-485 terminal block positions
wiring notes	Supports up to five attached HART devices (one in the same housing, up to four external).
inter-frame delay	8 ms
protocol notes	HMA typically responds within about 8 milliseconds. Unkey Delay on master should be less than 7 milliseconds.
model register	1002
serial register	1213
firmware register	1205
power	9 to 30 VDC @ 200mA
doc revision	BULLETIN: 41-621.0, March 2015

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

confirmed: Setting DIP switch position 1 to OFF configures the HMA to communicate via Modbus RTU with default settings: 9600 baud, 8 data bits, even parity, 1 stop bit, address 247 — confirmed by Magnetrol 41-621 HART to Modbus Adaptor Operating Manual [2.4.1]
confirmed: pv_value @ 1302, sv_value @ 1304, tv_value @ 1306, qv_value @ 1308 — confirmed by Magnetrol 41-621 Modbus Register Map
confirmed: blocking_distance @ 3100, level_unit_code @ 2140, level_offset @ 3102, sensitivity @ 3131, level_threshold_amplitude @ 3134, interface_threshold_amplitude @ 3135 — confirmed by Magnetrol 41-621 Modbus 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.
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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