ENGINEERING TOMORROW
Basic Modbus parameter list
AK-CC55 Compact
SW Ver. 2.1x
Programming Guide
Case controllers
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This publication contains information proprietary to Danfoss. By accepting and using this interface description the user agrees that the information contained herein will be used solely for operating equipment from Danfoss or equipment from other vendors provided that such equipment is intended for communication with Danfoss AK-CC55 Compact Controllers over the RS 485 Modbus serial communication link.
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Modbus Communication
Danfoss AK-CC55 controllers are using Modbus RTU.
Communication speed is default “auto detection”
Default communication settings are “8 bit, Even parity, 1 stop bit”.
Network address can be set via AK-UI55 setting display and Network address as well as Network communication settings can be changed via the AK-UI55 Bluetooth display and the AK-CC55 Connect service app. For further information see AK-CC55 Documentation.
Danfoss AK-CC55 controllers are Modbus compliant and MODBUS Application Protocol Specification can be found via below link http://modbus.org/specs.php
AK-CC55 Documentation:
AK-CC55 User Guides and Installation Guides can be found via www.danfoss.com: https://www.danfoss.com/en/products/electronic-controls/dcs/evaporator-and-room-control/#taboverview
Parameter list for Compact (084B4081)
| Parameter | PNU | Value | Min. | Max. | Type | RW | Scale | A |
| Readouts | ||||||||
| — Sum alarm | 2541 | 0 | 0 | 1 | Boolean | R | 1 | |
| u00 Ctrl. State | 2007 | 0 | 0 | 48 | Integer | R | 1 | |
| u17 Ther. air | 2532 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u26 EvapTemp Te | 2544 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u20 S2 temp | 2537 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u12 S3 air temp. | 2530 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u16 S4 air temp. | 2531 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u09 S5 temp | 1011 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| U72 Food temp | 2702 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u23 EEV OD % | 2528 | 0 | 0 | 100 | Integer | R | 1 | X |
| U02 PWM OD % | 2633 | 0 | 0 | 100 | Integer | R | 1 | X |
| U73 Def.StopTemp | 2703 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u57 Alarm air | 2578 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u86 Ther. band | 2607 | 1 | 1 | 2 | Integer | R | 0 | |
| u13 Night cond | 2533 | 0 | 0 | 1 | Boolean | R | 1 | |
| u90 Cutin temp. | 2612 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u91 Cutout temp. | 2513 | 0 | -2000 | 2000 | Float | R | 0.1 | |
| u21 Superheat | 2536 | 0 | -2000 | 2000 | Float | R | 0.1 | X |
| u22 SuperheatRef | 2535 | 0 | -2000 | 2000 | Float | R | 0.1 | X |
| Settings | ||||||||
| r12 Main switch | 117 | 0 | -1 | 1 | Integer | RW | 1 | |
| r00 Cutout | 100 | 20 | -500 | 500 | Float | RW | 0.1 | |
| r01 Differential | 101 | 20 | 1 | 200 | Float | RW | 0.1 | |
| — Def. Start | 1013 | 0 | 0 | 1 | Boolean | RW | 1 | |
| d02 Def . Stop temp | 1001 | 60 | 0 | 500 | Float | RW | 0.1 | |
| A03 Alarm delay | 10002 | 30 | 0 | 240 | Integer | RW | 1 | |
| A13 HighLim Air | 10019 | 80 | -500 | 500 | Float | RW | 0.1 | |
| A14 LowLim Air | 10020 | -300 | -500 | 500 | Float | RW | 0.1 | |
| r21 Cutout 2 | 131 | 2.0 | -60.0 | 50.0 | Float | RW | 1 | |
| r93 Diff Th2 | 210 | 2.0 | 0.1 | 20.0 | Float | RW | 1 | |
Note: Parameters marked with “X” in the “A” (App mode column) is not present in all App modes (for further info see AK-CC55 User Guide).
| Parameter | PNU | Value | Min. | Max. | Type | RW | Scale | A |
| d02 Def.StopTemp | 1001 | 6.0 | 0.0 | 50.0 | Float | RW | 1 | |
| d04 Max Def.time | 1003 | 45 | d24 | 360 | Integer | RW | 0 | |
| d28 DefStopTemp2 | 1046 | 6.0 | 0.0 | 50.0 | Float | RW | 1 | |
| d29 MaxDefTime2 | 1047 | 45 | d24 | 360 | Integer | RW | 0 | |
| Alarms | ||||||||
| — Contr. error | 20000 | 0 | 0 | 1 | Boolean | R | 1 | |
| — RTC error | 20001 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Pe error | 20002 | 0 | 0 | 1 | Boolean | R | 1 | |
| — S2 error | 20003 | 0 | 0 | 1 | Boolean | R | 1 | |
| — S3 error | 20004 | 0 | 0 | 1 | Boolean | R | 1 | |
| — S4 error | 20005 | 0 | 0 | 1 | Boolean | R | 1 | |
| — S5 error | 20006 | 0 | 0 | 1 | Boolean | R | 1 | |
| — High t.alarm | 20007 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Low t. alarm | 20008 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Door alarm | 20009 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Max HoldTime | 20010 | 0 | 0 | 1 | Boolean | R | 1 | |
| — No Rfg. sel. | 20011 | 0 | 0 | 1 | Boolean | R | 1 | |
| — DI1 alarm | 20012 | 0 | 0 | 1 | Boolean | R | 1 | |
| — DI2 alarm | 20013 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Standby mode | 20014 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Case clean | 20015 | 0 | 0 | 1 | Boolean | R | 1 | |
| — CO2 Alarm | 20016 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Refg.Leak | 20017 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Wrong IO cfg | 20018 | 0 | 0 | 1 | Boolean | R | 1 | |
| — Max Def.Time | 20019 | 0 | 0 | 1 | Boolean | R | 1 | |
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Modbus Specifications and Implementation Guides
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