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.
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 |
|---|---|---|---|---|
| defrost_probe_1_reading | 0 | I16 | 0.1 | |
| defrost_probe_2_reading | 1 | I16 | 0.1 | |
| virtual_probe | 2 | I16 | 0.1 | |
| probe_1_reading | 3 | I16 | 0.1 | |
| probe_2_reading | 4 | I16 | 0.1 | |
| probe_3_reading | 5 | I16 | 0.1 | |
| probe_4_reading | 6 | I16 | 0.1 | |
| set_point | 15 | I16 | 0.1 | |
| max_temperature_read | 20 | I16 | 0.1 | |
| min_temperature_read | 21 | I16 | 0.1 | |
| low_temperature_alarm_threshold | 26 | I16 | 0.1 | |
| high_temperature_alarm_threshold | 27 | I16 | 0.1 | |
| high_condenser_temperature_alarm_threshold | 28 | I16 | 0.1 | |
| frost_protection_alarm_threshold | 35 | I16 | 0.1 |
⚠ Separate probe and digital input signal cables from cables carrying inductive loads and power cables. Never run power and signal cables in the same conduits. — Starkest reads only; we never write a control register.
| terminals | fixed screw, plug-in or spade terminals |
| A/B polarity | Model IROPZ485S0 automatically recognises TxRx+ and TxRx- signals (reverse connection) |
| termination | 120 Ohm terminating resistor to be installed on the terminals of the last connected controller |
| connector | 4 pin AMP connector for programming key / serial interface |
| isolation | reinforced, 6 mm clearance, 8 mm creepage, 3750V insulation from extra low voltage parts |
| shield/ground | connect only one end of the shield to the earth on the electrical panel |
| wiring notes | RS485 serial interface (P/N IROPZ48500 or IROPZ485S0) plugs directly into the programming key connector |
| protocol notes | Maximum of 207 units on the supervisor network |
| power | 12 V~, 12 to 24 V~, 115 V~, 115/230 V~, 230 V~ (50/60 Hz), 12/18 Vdc, 12/30 Vdc depending on model |
| environment | Operating temperature: -10 to 60 °C (ir33+) or -10 to 65 °C (wide/easy models); Storage temperature: -20 to 70 °C; Humidity: < 90% RH non-condensing; Front panel IP65 |
| accuracy | Standard Carel NTC: 1 °C (-50 to 50 °C), 3 °C (50 to 90 °C); High temp NTC: 1.5 °C (-20 to 115 °C); Standard Carel PTC: 2 °C (-50 to 50 °C) |
| certifications | ISO 9001, CE, UL, VDE, EN 13485 |
| doc revision | ir33plus +0300028EN rel. 1.1 - 05.05.2017 |
⚠ disputed: defrost_probe_1_reading @ 0 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which shows no Modbus variables at addresses 0 and 1; analogue variables start at address 3 (Virtual probe).
⚠ disputed: defrost_probe_2_reading @ 1 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which shows no Modbus variables at addresses 0 and 1; analogue variables start at address 3 (Virtual probe).
⚠ disputed: max_temperature_read @ 20 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which maps rH (Maximum temperature read) to Modbus address 22 (0-based: 21).
⚠ disputed: min_temperature_read @ 21 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which maps rL (Minimum temperature read) to Modbus address 21 (0-based: 20).
⚠ disputed: low_temperature_alarm_threshold @ 26 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which maps AL (Low temperature alarm threshold) to Modbus address 28 (0-based: 27). Address 26 is A0 (Alarm differential).
⚠ disputed: high_temperature_alarm_threshold @ 27 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which maps AH (High temperature alarm threshold) to Modbus address 29 (0-based: 28). Address 27 is A1 (Alarm threshold type).
⚠ disputed: high_condenser_temperature_alarm_threshold @ 28 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which maps Ac (Condenser high temperature alarm threshold) to Modbus address 160 (0-based: 159). Address 28 is AL (Low temperature alarm threshold).
⚠ disputed: frost_protection_alarm_threshold @ 35 — disputed by Carel ir33+ User Manual (+0300028EN rel. 1.1) which maps ALF (Antifreeze alarm threshold) to Modbus address 435 (0-based: 434). Address 35 is c8 (Compressor start delay after opening PD valve).
Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.
Device not here? Upload its manual and get a checked map back. It's free.
Want it confirmed against your own device? Order hardware verification. If it doesn't check out, you don't pay.
Building on a lot of devices? License the library — machine-readable maps, the firmware matrix, and API access.