E+E EE310 humidity/temp transmitter (RS485 models)

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
Modbus address	0	U16	1
Modbus protocol settings	1	U16	1
Firmware version	8	U16	1
Sensor name	9	U16	1
Temperature	1002	F32LE	1	°C
Temperature	1004	F32LE	1	°F
Relative humidity	1020	F32LE	1	%
Water vapour partial pressure	1100	F32LE	1	mbar
Water vapour partial pressure	1102	F32LE	1	psi
Dew point temperature	1104	F32LE	1	°C
Dew point temperature	1106	F32LE	1	°F
Wet bulb temperature	1108	F32LE	1	°C
Wet bulb temperature	1110	F32LE	1	°F
Absolute humidity	1112	F32LE	1	g/m3
Absolute humidity	1114	F32LE	1	gr/ft3
Mixing ratio	1120	F32LE	1	g/kg
Mixing ratio	1122	F32LE	1	gr/lb
Specific enthalpy	1124	F32LE	1	kJ/kg
Specific enthalpy	1126	F32LE	1	ft lbf/lb
Specific enthalpy	1128	F32LE	1	BTU/lb
Frost point / Dew point temperature	1130	F32LE	1	°C
Frost point / Dew point temperature	1132	F32LE	1	°F
Volume concentration	1150	F32LE	1	ppm
Ice bulb temperature	1682	F32LE	1	°C
Ice bulb temperature	1684	F32LE	1	°F
Air pressure	5000	F32LE	1	mbar

link settings as documented (unverified): RTU/TCP; default 9600 8E1; unit ID 231; FC 03,04,06,16; Modbus RTU is available via Option J3, Modbus TCP via Option J4.

bench facts as documented (unverified)

terminals	Screw terminals max. 1.5 mm² (AWG 16)
termination	Both ends of the bus shall be terminated with a resistor Ra=120 Ω.
connector	M12 socket, M12 plug, RJ45
isolation	galvanically isolated
shield/ground	GND RS485 (shielded)
model register	9
serial register	0
firmware register	8
power	8 - 35 V DC / 12 - 30 V AC, or 100 - 240 V AC (Option AM3)
environment	Operation: -40...+60 °C (-40...+140 °F) without display, -20...+50 °C (-4...+122 °F) with display
accuracy	RH: ±(0.95 + 0.0013 * mv) %RH, T: ±0.1 °C
certifications	CE, UKCA, FCC Part15 ClassA, ICES-003 ClassA

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

confirmed: comms: baud_rates [300 to 76800], default_baud [9600], default_unit_id [231], framing [RTU, TCP], function_codes [3, 4, 6, 16], parity [E], stop_bits [1], and notes — confirmed by E+E Elektronik EE310 Datasheet and User Manual
confirmed: facts: accuracy [RH: ±(0.95 + 0.0013 * mv) %RH, T: ±0.1 °C], certifications [CE, UKCA, FCC Part15 ClassA, ICES-003 ClassA], environment [Operation: -40...+60 °C without display, -20...+50 °C with display], identification registers [0-based: serial @ 0, firmware @ 8, model @ 9], physical specifications [M12, RJ45, galvanic isolation, GND RS485 shield, 1.5 mm² screw terminals, Ra=120 Ω termination], and power [8-35 VDC / 12-30 VAC, or 100-240 VAC] — confirmed by E+E Elektronik EE310 Datasheet and User Manual
confirmed: register map: air_pressure @ 5000, relative_humidity @ 1020, temperature_c @ 1002, temperature_f @ 1004, dew_point_temperature_c @ 1104, dew_point_temperature_f @ 1106, frost_point_dew_point_temperature_c @ 1130, frost_point_dew_point_temperature_f @ 1132, absolute_humidity_g_m3 @ 1112, absolute_humidity_gr_ft3 @ 1114, mixing_ratio_g_kg @ 1120, mixing_ratio_gr_lb @ 1122, wet_bulb_temperature_c @ 1108, wet_bulb_temperature_f @ 1110, ice_bulb_temperature_c @ 1682, ice_bulb_temperature_f @ 1684, specific_enthalpy_kj_kg @ 1124, specific_enthalpy_btu_lb @ 1128, specific_enthalpy_ft_lbf_lb @ 1126, water_vapour_partial_pressure_mbar @ 1100, water_vapour_partial_pressure_psi @ 1102, volume_concentration_ppm @ 1150 — confirmed by E+E Elektronik EE310 User Manual Modbus Register Map (converting 1-based register numbers to 0-based protocol addresses)

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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