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Chiller · Modbus register map
Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) Modbus register map
Updated 25 October 2026
Air-cooled screw chiller with two refrigerant circuits, each with a variable-speed screw compressor. The MicroTech controller speaks Modbus RTU through a plug-on RS-485 module, and every point is a 16-bit holding register: water and refrigerant temperatures, pressures, compressor amps/volts/kW, enable and setpoint commands, status enums, alarm indexes and run-hour counters. Values follow an English/Metric setting.
This page lists 96 Modbus registers for the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) — 17 writable — with the table, 0-based wire address, data type, word order, scale, units and access of each, re-typed from Daikin Applied’s own free documentation (linked below) and checked against it.
- Manufacturer
- Daikin Applied
- Model
- Pathfinder AWV air-cooled screw chiller (MicroTech controller)
- Equipment type
- Chiller
- Registers
- 96 (17 writable)
- Transport
- Modbus RTU
- Default unit ID
- 1
- Default serial
- 38400 baud, 8N2
- Documented addressing
- 1-based (subtract 1 for the wire address)
- 32-bit word order
- CDAB low word first (word-swapped)
- Firmware
- AWV application software 263220504 (document baseline); individual points need 263220112 / 263220502 / 263220504 / 263220505 or newer as marked.
- Also known as
- AWV, Pathfinder AWV, Pathfinder VFD air-cooled screw, MicroTech chiller unit controller, ED 15121
Integration notes: Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller)
Fit the Modbus module, set address and baud at the keypad (Modbus Setup), apply so the controller reboots, then poll holding registers with function 03. Read 1 (Local/Remote) and 316 (Units) first; use 9 to enable, 35 for the chilled-water setpoint, 38 for capacity limit, and 5 plus 28-33 for alarms.
Minimum registers to map
Addresses are 0-based wire addresses. Enough to monitor and run the unit; map more as the job needs.
| Register | Name | Type | Why | Access |
|---|---|---|---|---|
| HR 0 | Chiller Local/Remote | UINT16 | Local/Remote - network commands only work in Remote | Read |
| HR 14 | Chiller Status | UINT16 | Chiller status | Read |
| HR 16 | Evaporator Leaving Fluid Temperature | INT16 | Leaving chilled water temperature | Read |
| HR 12 | Actual Capacity | UINT16 | Actual capacity | Read |
| HR 8 | Chiller Enable Setpoint | UINT16 | Network enable command | Read/write |
| HR 34 | Cool Setpoint - Network | INT16 | Cooling setpoint command | Read/write |
| HR 37 | Capacity Limit Setpoint - Network | UINT16 | Capacity limit command | Read/write |
| HR 4 | Alarm Digital Output | UINT16 | Any alarm active | Read |
| HR 29 | Fault Alarm Index | UINT16 | Active fault index | Read |
| HR 315 | Units (English/Metric) | UINT16 | English/Metric flag | Read/write |
Enable Modbus control & writes
A Modbus communication module must be attached to the unit controller. Set Network Address and Baud Rate at the keypad (password 5321, View/Set Unit > Modbus Setup), then Apply Changes = Yes to reboot the controller. Chiller Local/Remote (register 1) must read Remote (0) - it can only be changed at the keypad - or enable, mode, setpoint, capacity-limit and clear-alarm writes are ignored.
Communication loss & watchdog
The module's Com LED Timeout (0-3600 s, default 3 s) only turns the BUS LED red when the master stops polling; no control fallback on communication loss is documented. Enable, mode and clear-alarm commands have a Null value that falls back to Disable / Cool / Normal when nothing writes them.
Byte order & addressing
- Printed register numbers are 1-based without the 4xxxx prefix: subtract 1 for the wire address.
- 32-bit run-hour counters are low word first (CDAB).
- Most analog values are x10 and follow the English/Metric Units register (316); the multiplier does not change with units.
- Alarm codes carry the alarm index in the high byte; the low byte holds circuit (bits 5-7), compressor (bits 2-4) and level (bits 0-1: 1 warning, 2 problem, 3 fault).
- Many diagnostic registers (800s, 1100s, 1800s-1900s) exist only with newer AWV application code.
Network setup
- Address 1-247 (default 1); baud 4800/9600/19200/38400 (default 38400); parity Even/Odd/None (default None); Two Stop Bits Yes/No (default Yes).
- RS-485 is 3-wire (+, -, REF) shielded twisted pair, daisy-chained. The module's Load Resistor setting (default No) switches in termination; set Yes only on the first or last device.
- Response Delay defaults to 5 ms; raise it only for slow masters.
- Network parameters revert to defaults after an application software field upgrade - recheck them.
Watch out for
- Writes are silently ignored while register 1 reads Local (1).
- Chiller Mode Setpoint only matters when Available Modes at the keypad is not Cool Only.
- Some manual-reset lockouts (low evaporator pressure, high condenser pressure, freeze) cannot be cleared from the network.
- Compressor voltage is not available on AWV units with a Turboscrew compressor.
Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) Modbus registers
Address = 0-based wire address (the documented number is shown under it when it differs) · Order: ABCD = high word first, CDAB = low word first · Scale: engineering value = raw × scale.
| Table | Address | Name | Description | Type | Order | Scale | Units | Access | Values / bits |
|---|---|---|---|---|---|---|---|---|---|
| HR | 0doc 1 | Chiller Local/Remote | Set at the keypad only; Local makes the controller ignore network commands. | UINT16 | Read | 0 = Remote; 1 = Local | |||
| HR | 1doc 2 | Chiller Enable Output | UINT16 | Read | 0 = Disable; 1 = Enable | ||||
| HR | 2doc 3 | Run Enabled | Chiller may start if operating conditions allow. | UINT16 | Read | 0 = Off; 1 = Run allowed | |||
| HR | 3doc 4 | Chiller Capacity Limited | UINT16 | Read | 0 = Not limited; 1 = Limited | ||||
| HR | 4doc 5 | Alarm Digital Output | Poll this for any active alarm. | UINT16 | Read | 0 = No alarm; 1 = Alarm | |||
| HR | 5doc 6 | Evaporator Flow Switch Status | UINT16 | Read | 0 = No flow; 1 = Flow | ||||
| HR | 7doc 8 | Chiller On/Off | UINT16 | Read | 0 = Off; 1 = On | ||||
| HR | 8doc 9 | Chiller Enable Setpoint | Network enable; Null behaves as Disable. | UINT16 | Read/write | 0 = Disable; 1 = Enable; 2 = Null | |||
| HR | 9doc 10 | Clear Alarms - Network | Some lockout alarms cannot be cleared from the network. | UINT16 | Read/write | 0 = Normal; 1 = Clear alarms; 2 = Null | |||
| HR | 10doc 11 | Chiller Mode Output | UINT16 | Read | 1 = Ice; 2 = Cool; 3 = Heat; 4 = Cool/Heat Recovery; 5 = Defrost | ||||
| HR | 11doc 12 | Active Setpoint | Leaving water setpoint in use (Cool or Ice), °F x10. | INT16 | × 0.1 | °F | Read | ||
| HR | 12doc 13 | Actual Capacity | Percent of maximum capacity, x10. | UINT16 | × 0.1 | % | Read | ||
| HR | 13doc 14 | Active Capacity Limit Output | Lowest of all active capacity limits, x10. | UINT16 | × 0.1 | % | Read | ||
| HR | 14doc 15 | Chiller Status | UINT16 | Read | 1 = Off; 2 = Start; 3 = Run; 4 = Pre Shutdown; 5 = Service | ||||
| HR | 15doc 16 | Evaporator Entering Fluid Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 16doc 17 | Evaporator Leaving Fluid Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 23doc 24 | Outdoor Air Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 26doc 27 | Total Kilowatts | Total chiller power, 0-3500 kW. | UINT16 | kW | Read | |||
| HR | 27doc 28 | Warning Alarm Index | Index of the active warning (highest index); 0 = none. | UINT16 | Read | ||||
| HR | 28doc 29 | Problem Alarm Index | Index of the active problem alarm (highest index); 0 = none. | UINT16 | Read | ||||
| HR | 29doc 30 | Fault Alarm Index | Index of the active fault (highest index); 0 = none. | UINT16 | Read | ||||
| HR | 30doc 31 | Warning Alarm Code | Encoded code of the active warning; 0 = none. | UINT16 | Read | ||||
| HR | 31doc 32 | Problem Alarm Code | Encoded code of the active problem alarm; 0 = none. | UINT16 | Read | ||||
| HR | 32doc 33 | Fault Alarm Code | Encoded code of the active fault; 0 = none. | UINT16 | Read | ||||
| HR | 33doc 34 | Chiller Mode Setpoint - Network | Null runs Cool. Needs Available Modes other than Cool Only. | UINT16 | Read/write | 0 = Null; 1 = Ice; 2 = Cool; 3 = Heat; 4 = Cool/Heat Recovery | |||
| HR | 34doc 35 | Cool Setpoint - Network | Chilled fluid setpoint 24.98-60.08 °F x10; default 43.88 °F. | INT16 | × 0.1 | °F | Read/write | ||
| HR | 35doc 36 | Ice Setpoint - Network | AWV range 17.6-39.2 °F x10; default 24.98 °F. | INT16 | × 0.1 | °F | Read/write | ||
| HR | 37doc 38 | Capacity Limit Setpoint - Network | Network capacity limit 0-100 % x10; default 100 %. | UINT16 | × 0.1 | % | Read/write | ||
| HR | 38doc 39 | Circuit 1 Condenser Refrigerant Pressure | psi x10 (kPa x10 in Metric; to 4826 kPa for R-410A). | UINT16 | × 0.1 | psi | Read | ||
| HR | 39doc 40 | Circuit 1 Condenser Saturated Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 40doc 41 | Circuit 1 Evaporator Refrigerant Pressure | psi x10 (kPa x10 in Metric); signed range. | INT16 | × 0.1 | psi | Read | ||
| HR | 42doc 43 | Circuit 2 Condenser Refrigerant Pressure | psi x10 (kPa x10 in Metric; to 4826 kPa for R-410A). | UINT16 | × 0.1 | psi | Read | ||
| HR | 43doc 44 | Circuit 2 Condenser Saturated Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 44doc 45 | Circuit 2 Evaporator Refrigerant Pressure | psi x10 (kPa x10 in Metric); signed range. | INT16 | × 0.1 | psi | Read | ||
| HR | 45doc 46 | Circuit 2 Evaporator Saturated Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 64doc 65 | Circuit 1 Compressor 1 Suction Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 67doc 68 | Circuit 1 Compressor 1 Discharge Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 68doc 69 | Circuit 1 Compressor 1 Percent RLA | Motor load as percent of rated load amps, 0-100 %. | UINT16 | % | Read | |||
| HR | 69doc 70 | Circuit 1 Compressor 1 Current | Average motor current, 0-10000 A. | UINT16 | A | Read | |||
| HR | 70doc 71 | Circuit 1 Compressor 1 Voltage | Average motor voltage, 0-15000 VAC. Not on Turboscrew compressors. | UINT16 | V | Read | |||
| HR | 71doc 72 | Circuit 1 Compressor 1 Power | Motor power, 0-3500 kW. | UINT16 | kW | Read | |||
| HR | 72doc 73 | Circuit 1 Compressor 1 Starts | Start counter, 0-65535. | UINT16 | Read | ||||
| HR | 73doc 74-75 | Circuit 1 Compressor 1 Run Hours | 0-999,999 h; low word in 74. | UINT32 | CDAB | h | Read/write | ||
| HR | 103doc 104 | Circuit 2 Compressor 1 Suction Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 106doc 107 | Circuit 2 Compressor 1 Discharge Refrigerant Temperature | °F x10 (°C x10 when Units = Metric). | INT16 | × 0.1 | °F | Read | ||
| HR | 107doc 108 | Circuit 2 Compressor 1 Percent RLA | Motor load as percent of rated load amps. | UINT16 | % | Read | |||
| HR | 108doc 109 | Circuit 2 Compressor 1 Current | Average motor current, 0-10000 A. | UINT16 | A | Read | |||
| HR | 109doc 110 | Circuit 2 Compressor 1 Voltage | Average motor voltage, 0-15000 VAC. Not on Turboscrew compressors. | UINT16 | V | Read | |||
| HR | 110doc 111 | Circuit 2 Compressor 1 Power | Motor power, 0-3500 kW. | UINT16 | kW | Read | |||
| HR | 111doc 112 | Circuit 2 Compressor 1 Starts | Start counter, 0-65535. | UINT16 | Read | ||||
| HR | 112doc 113-114 | Circuit 2 Compressor 1 Run Hours | 0-999,999 h; low word in 113. | UINT32 | CDAB | h | Read/write | ||
| HR | 169doc 170 | Circuit 1 Compressor VFD Temperature | VFD heat-sink temperature, °F x10. AWV app 263220502+. | INT16 | × 0.1 | °F | Read | ||
| HR | 170doc 171 | Circuit 2 Compressor VFD Temperature | VFD heat-sink temperature, °F x10. AWV app 263220502+. | INT16 | × 0.1 | °F | Read | ||
| HR | 302doc 303-304 | Evaporator Pump 1 Run Hours | 0-999,999 h; low word in 303. | UINT32 | CDAB | h | Read | ||
| HR | 304doc 305 | Evaporator Pump 1 Status | UINT16 | Read | 0 = Pump off request; 1 = Pump on request | ||||
| HR | 305doc 306-307 | Evaporator Pump 2 Run Hours | 0-999,999 h; low word in 306. | UINT32 | CDAB | h | Read | ||
| HR | 307doc 308 | Evaporator Pump 2 Status | UINT16 | Read | 0 = Pump off request; 1 = Pump on request | ||||
| HR | 308doc 309 | Clock Year | Controller clock; write to sync with the BAS. | UINT16 | Read/write | ||||
| HR | 309doc 310 | Clock Month | 1-12. | UINT16 | Read/write | ||||
| HR | 310doc 311 | Clock Date | Day of month, 1-31. | UINT16 | Read/write | ||||
| HR | 311doc 312 | Clock Day of Week | Calculated by the controller. | UINT16 | Read | 0 = Monday; 1 = Tuesday; 2 = Wednesday; 3 = Thursday; 4 = Friday; 5 = Saturday; 6 = Sunday | |||
| HR | 312doc 313 | Clock Hour | 0-23. | UINT16 | Read/write | ||||
| HR | 313doc 314 | Clock Minute | 0-59. | UINT16 | Read/write | ||||
| HR | 314doc 315 | Clock Second | 0-59. | UINT16 | Read/write | ||||
| HR | 315doc 316 | Units (English/Metric) | Unit system for all network values; default English. | UINT16 | Read/write | 0 = English; 1 = Metric | |||
| HR | 316doc 317 | Chiller Model | UINT16 | Read | 0 = Centrifugal; 1 = Water cooled; 2 = Air cooled; 3 = Heat pump; 9 = Other | ||||
| HR | 317doc 318-327 | Chiller Location | Up to 20 ASCII characters, two per register, first character in the high byte. | STRING[20] | Read/write | ||||
| HR | 333doc 334-338 | Application Software Version | Up to 10 ASCII characters, two per register, first character in the high byte. | STRING[10] | Read | ||||
| HR | 399doc 400 | Waterside Economizer Entering Water Temperature | °F x10. Waterside economizer option; AWV app 263220502+. | INT16 | × 0.1 | °F | Read | ||
| HR | 839doc 840 | Control Panel Internal Temperature | °F x10. AWV app 263220504+. | INT16 | × 0.1 | °F | Read | ||
| HR | 840doc 841 | Power Panel Internal Temperature | °F x10. AWV app 263220504+. | INT16 | × 0.1 | °F | Read | ||
| HR | 841doc 842 | Harmonic Filter Internal Temperature | °F x10. AWV app 263220504+. | INT16 | × 0.1 | °F | Read | ||
| HR | 842doc 843 | Circuit 1 Liquid Line Approach Temperature | 0-50 °F x10. AWV app 263220504+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 843doc 844 | Circuit 2 Liquid Line Approach Temperature | 0-50 °F x10. AWV app 263220504+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 844doc 845 | Main Power Loss | AWV app 263220505+. | UINT16 | Read | 0 = Normal; 1 = Power loss | |||
| HR | 845doc 846 | Circuit 1 Subcooling Temperature | °F x10. AWV app 263220505+. | INT16 | × 0.1 | °F | Read | ||
| HR | 846doc 847 | Circuit 2 Subcooling Temperature | °F x10. AWV app 263220505+. | INT16 | × 0.1 | °F | Read | ||
| HR | 969doc 970 | Circuit 1 Compressor 1 Unavailable | AWV app 263220112+. | UINT16 | Read | 0 = Available; 1 = Unavailable | |||
| HR | 971doc 972 | Circuit 2 Compressor 1 Unavailable | AWV app 263220112+. | UINT16 | Read | 0 = Available; 1 = Unavailable | |||
| HR | 1099doc 1100 | Evaporator Recirculate Time Remaining | 0-300 s. AWV app 263220502+. | UINT16 | s | Read | |||
| HR | 1100doc 1101 | Circuit 1 Cycle Time Remaining | 0-3600 s. AWV app 263220502+. | UINT16 | s | Read | |||
| HR | 1101doc 1102 | Circuit 2 Cycle Time Remaining | 0-3600 s. AWV app 263220502+. | UINT16 | s | Read | |||
| HR | 1808doc 1809 | Circuit 2 Compressor 1 Oil Feed Pressure | psi x10 (kPa x10 in Metric); signed range. | INT16 | × 0.1 | psi | Read | ||
| HR | 1848doc 1849 | Circuit 1 Compressor 1 Oil Feed Pressure | psi x10 (kPa x10 in Metric); signed range. | INT16 | × 0.1 | psi | Read | ||
| HR | 1853doc 1854 | Waterside Economizer State | Current cooling mode. Waterside economizer option only. | UINT16 | Read | 0 = Off; 1 = Mech; 2 = Hybrid; 3 = WsEcon | |||
| HR | 1854doc 1855 | Waterside Economizer Enable Setpoint | Used only when Local/Remote = Remote. Option only. | UINT16 | Read/write | 0 = Disable; 1 = Enable | |||
| HR | 1898doc 1899 | Circuit 1 Evaporator Superheat Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1899doc 1900 | Circuit 2 Evaporator Superheat Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1910doc 1911 | Circuit 1 Discharge Superheat Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1911doc 1912 | Circuit 2 Discharge Superheat Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1967doc 1968 | Circuit 2 Liquid Line Refrigerant Temperature | °F x10. AWV app 263220502+. | INT16 | × 0.1 | °F | Read | ||
| HR | 1970doc 1971 | Circuit 2 Condenser Approach Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1971doc 1972 | Circuit 2 Evaporator Approach Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1983doc 1984 | Circuit 1 Liquid Line Refrigerant Temperature | °F x10. AWV app 263220502+. | INT16 | × 0.1 | °F | Read | ||
| HR | 1986doc 1987 | Circuit 1 Condenser Approach Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read | ||
| HR | 1987doc 1988 | Circuit 1 Evaporator Approach Temperature | 0-50 °F x10. AWV app 263220502+. | UINT16 | × 0.1 | °F | Read |
Notes on this map
- Network settings (address 1, 38400 bps, parity None, two stop bits, response delay, Com LED timeout) are from the companion manual IM 969-7, MicroTech Chiller Unit Controller Modbus Communication Module (Oct 2023): https://tahoeweb.daikinapplied.com/api/general/DownloadDocumentByName/media/Daikin_Applied_IM_969-7_MT_Chiller_Modbus_Comm_Manual.pdf/
- ED 15121 is shared by AGZ, AMZ, AWS, ADS, WME-B and WWV/TWV chillers. Only points that Table 3 marks in the AWV column are listed, and only the 'Compressor 1' slots of circuits 1 and 2 (the other compressor slots in the tables belong to multi-compressor models).
- Two-register counters: the document's worked example (run hours 99900 = 0x0001863C stored as 74 = 0x863C, 75 = 0x0001) puts the low word in the lower register, so they are CDAB.
- Strings: two ASCII characters per register, leftmost character in the lowest register and in the high byte (Figure 1 example: 0x3235 = '25').
- The document never defines 'x 10'. Its ranges and defaults (for example 'Default: 43.88°F x 10', '0-100% x 10') only make sense as raw = value x 10, so those registers use scale 0.1.
- Signedness is not stated. A register is INT16 when its published English or Metric range goes negative; otherwise UINT16. Condenser pressure is UINT16 because 4826 kPa x10 does not fit a signed register.
- Units follow register 316 (English default). Units shown are the English ones (°F, psi); in Metric the same registers carry °C and kPa with the same multiplier.
- Left out: Circuit 1 evaporator saturated refrigerant temperature (42), because ED 15121-13 prints its range without the 'x 10' that the other circuits' copies carry, so its scaling is not settled.
- Left out: HMI Unit Status (1107) and Circuit HMI Status (1108/1109), because the document lists only text abbreviations, no numeric values.
- Left out: points Table 3 does not mark for AWV (chiller current 25, condenser water points, flow rates, heat-recovery temperatures, heat setpoint, extra compressor slots) and the individual per-alarm registers (pp. 33-40). Alarm text for each index/code is in the document.
- The Waterside Economizer Enable Setpoint default is printed as 'Disable (1)' although 1 = Enable in the same cell; the value list is copied as printed. Register 1854 is listed read-only (its data-type column says RO although the access column says R/W).
- Total kW (27) is marked RW in the data-type column but R in the access column; it is listed read-only.
Check it against the live device. A register map tells you what the controller can expose; the unit in front of you may differ by firmware or options. Read a few registers and compare them with the unit’s own display; for a 32-bit value the float and byte-order decoder shows all four word orders at once, so a wrong word order or scale is obvious. New to this? Read what a register map is and why addresses are off by one.
Questions about the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller)
What Modbus registers does the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) have?
This map lists 96 registers: 96 holding registers. 17 of them can be written. Registers vary with firmware, options and configuration, so confirm against the device.
Are the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) Modbus addresses 0-based or 1-based?
The manufacturer's document numbers registers 1-based (subtract 1 for the wire address). Every address on this page is the 0-based wire address you put in the request; the documented number is shown under it where it differs. ED 15121 prints holding registers without the 4xxxx prefix (register 8 = 40008) and states the module is zero-based: register 40003 goes out as 0002 in the PDU. Wire address = printed number - 1.
What byte order does the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) use for 32-bit values?
Multi-register values in this map use CDAB (low word first (word-swapped)). Set your client to this order for every 32/64-bit value in the table.
What are the minimum Modbus registers to integrate the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller)?
Start with HR 0 Chiller Local/Remote (Local/Remote - network commands only work in Remote); HR 14 Chiller Status (Chiller status); HR 16 Evaporator Leaving Fluid Temperature (Leaving chilled water temperature); HR 12 Actual Capacity (Actual capacity); HR 8 Chiller Enable Setpoint (Network enable command); HR 34 Cool Setpoint - Network (Cooling setpoint command); HR 37 Capacity Limit Setpoint - Network (Capacity limit command); HR 4 Alarm Digital Output (Any alarm active); HR 29 Fault Alarm Index (Active fault index); HR 315 Units (English/Metric) (English/Metric flag).
How do I enable Modbus control of the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller)?
A Modbus communication module must be attached to the unit controller. Set Network Address and Baud Rate at the keypad (password 5321, View/Set Unit > Modbus Setup), then Apply Changes = Yes to reboot the controller. Chiller Local/Remote (register 1) must read Remote (0) - it can only be changed at the keypad - or enable, mode, setpoint, capacity-limit and clear-alarm writes are ignored.
What happens when the Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) loses Modbus communication?
The module's Com LED Timeout (0-3600 s, default 3 s) only turns the BUS LED red when the master stops polling; no control fallback on communication loss is documented. Enable, mode and clear-alarm commands have a Null value that falls back to Disable / Cool / Normal when nothing writes them.
Where is the official Daikin Applied Pathfinder AWV air-cooled screw chiller (MicroTech controller) Modbus documentation?
The source is MicroTech Chiller Unit Controller Protocol Information - Modbus Networks (ED 15121-13) (ED 15121-13), revision 2026-09, published free by Daikin Applied at https://tahoeweb.daikinapplied.com/api/general/DownloadDocumentByName/media/ED15121-13.pdf/.
More Daikin Applied Modbus register maps
- Rooftop unit
Daikin Applied Rebel / Rebel Applied rooftop (MicroTech 4 controller)
Daikin Applied Rebel Applied (DPSA, R-410A/R-32) and Rebel (DPS, R-32) packaged rooftops with MicroTech 4 controller and Modbus RTU module, per ED 19133-2 (Oct 2025).
Also known as: DPSA, DPS, Rebel Applied, Rebel, MicroTech 4 rooftop, ED 19133-2 - Chiller
Daikin Applied Trailblazer AGZ-F air-cooled scroll chiller (MicroTech controller)
Daikin Applied Trailblazer AGZ F-vintage air-cooled scroll chillers with the MicroTech unit controller and BACnet/Modbus communication module set to Modbus, per ED 19131-1 (application 1.2.0 and later).
Also known as: AGZ-F, AGZ F-Vintage, Trailblazer AGZ, Trailblazer AGZ-F, ED 19131
Source: MicroTech Chiller Unit Controller Protocol Information - Modbus Networks (ED 15121-13) · ED 15121-13 · rev. 2026-09. Register numbers, types, scaling and units are reproduced as published; descriptions are our own.