Daikin Applied MicroTech II chiller controller

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
active_setpoint	2	I16	0.1	°F
actual_capacity	10	U16	0.1	%
actual_rpm_comp_1	246	U16	1	RPM
actual_rpm_comp_2	250	U16	1	RPM
capacity_limit_output	42	U16	0.1	%
capacity_limit_setpoint	3	U16	0.1	%
chiller_mode_output	147	U16	1
chiller_mode_setpoint	145	U16	1
chiller_power	244	U16	1	kW
chiller_status	146	U16	1
compressor_2_active_capacity_limit	107	U16	1	%
compressor_2_vfd_speed	99	U16	1	%
compressor_select_current	26	U16	1	A
compressor_2_current	95	U16	1	A
compressor_select_discharge_temp	19	I16	0.1	°F
compressor_2_discharge_temp	91	I16	0.1	°F
compressor_select_percent_rla	25	U16	0.1	%
compressor_2_percent_rla	94	U16	0.1	%
compressor_select_power	27	U16	1	kW
compressor_2_power	96	U16	1	kW
compressor_select_run_hours	174	U16	10	hours
compressor_2_run_hours	235	U16	10	hours
compressor_select	160	U16	1
compressor_select_starts	173	U16	1	starts
compressor_2_starts	234	U16	1	starts
compressor_select_status	172	U16	1
compressor_2_status	233	U16	1
compressor_select_suction_temp	15	I16	0.1	°F
compressor_2_suction_temp	88	I16	0.1	°F
compressor_select_voltage	29	U16	1	VAC
compressor_2_voltage	98	U16	1	VAC
condenser_entering_water_temp	7	I16	0.1
condenser_leaving_water_temp	8	I16	0.1	°F
condenser_select_pump_run_hours	176	U16	10	hours
condenser_pump_2_run_hours	232	U16	10	hours
condenser_select_refrigerant_pressure	21	I16	0.1	psi
condenser_2_refrigerant_pressure	93	I16	0.1	psi
condenser_select_saturated_refrigerant_temp	20	I16	0.1	°F
condenser_2_saturated_refrigerant_temp	92	I16	0.1	°F
condenser_water_flow_rate	24	U16	1	GPM
cool_setpoint	1	I16	0.1	°F
evaporator_entering_water_temp	4	I16	0.1	°F
evaporator_leaving_water_temp_unit	6	I16	0.1
evaporator_select_refrigerant_pressure	17	I16	0.1	psi
evaporator_2_refrigerant_pressure	90	I16	0.1	psi
evaporator_select_saturated_refrigerant_temp	16	I16	0.1	°F
evaporator_2_saturated_refrigerant_temp	89	I16	0.1	°F
evaporator_water_flow_rate	18	U16	1	GPM
heat_recovery_entering_water_temp	22	I16	0.1	°F
heat_recovery_leaving_water_temp	23	I16	0.1	°F
heat_setpoint	5	I16	0.1	°F
ice_setpoint	50	I16	0.1	°F
outdoor_air_temperature	39	I16	0.1	°F

link settings as documented (unverified): RTU; FC 01,02,03,04,05,06,15,16; Supports RTU mode only. Uses 8 data bits, 1 or 2 stop bits, and no parity. Baud rates from 1200 to 19200 bps.

bench facts as documented (unverified)

wiring notes	Requires Modbus Communication Module (IM 743) installed.
identification notes	Software part number is available via the Modbus integration tools.
certifications	Products manufactured in an ISO Certified Facility.
doc revision	ED 15063-7
firmware applicability	MicroTech II Chiller Unit Controller

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

confirmed: Supports RTU mode only, uses 8 data bits, 1 or 2 stop bits, and no parity — confirmed by Sales and Engineering Data Sheet ED 15063-7
confirmed: Requires Modbus Communication Module (IM 743) installed — confirmed by Sales and Engineering Data Sheet ED 15063-7 and IM 743-6
confirmed: active_setpoint @ 2, actual_capacity @ 10, capacity_limit_output @ 42, capacity_limit_setpoint @ 3, chiller_mode_output @ 147, chiller_mode_setpoint @ 145, chiller_status @ 146 — confirmed by Sales and Engineering Data Sheet ED 15063-7
confirmed: compressor_select @ 160 (Holding Register 40161) — confirmed by Sales and Engineering Data Sheet ED 15063-7
confirmed: compressor_2_active_capacity_limit @ 107, compressor_2_vfd_speed @ 99 — confirmed by Sales and Engineering Data Sheet ED 15063-7

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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