CoolAutomation CoolMasterNet Quick setup guide

© 2017 CoolAutomation LTD.
Modbus Integration Guidelines
Document Revision 0.5 10/17/2017
www.coolautomation.com
CoolMasterNet
CooLinkNet
CooLinkHub
Modbus Integration
Guidelines

2
Contents
Modbus Integration Guidelines
www.coolautomation.com © 2017 CoolAutomation LTD.
Table of Contents
1 Connection 4
........................................................................................................................................................................ 4
1.1 Modbus RTUConnection
........................................................................................................................................................................ 5
1.2 Modbus IP Connection
2 Configuration 6
........................................................................................................................................................................ 6
2.1 Modbus RTUConfiguration
.......................................................................................................................................................... 6Modbus Slave Address
.......................................................................................................................................................... 7Modbus RTU Frame Format
........................................................................................................................................................................ 7
2.2 Modbus IP Configuration
........................................................................................................................................................................ 7
2.3 VA's Configuration
3Modbus Tables 10
........................................................................................................................................................................ 10
3.1 CoolMasterNet Modbus Tables
.......................................................................................................................................................... 12Special Devices
........................................................................................................................................................................ 12
3.2 CooLinkNet Modbus Tables
........................................................................................................................................................................ 13
3.3 HVAC Malfunction Codes
4PRO Functionality 18
........................................................................................................................................................................ 18
4.1 PRO Modbus Tables.......................................................................................................................................................... 18DK ......................................................................................................................................................... 18DK PRO Indoor Units
......................................................................................................................................................... 18DK PRO Outdoor Systems
......................................................................................................................................................... 20DK PRO Outdoor Units
.......................................................................................................................................................... 27ME ......................................................................................................................................................... 28MEPRO Indoor Units
......................................................................................................................................................... 28MEPRO Outdoor Units
5Commands Reference 39
........................................................................................................................................................................ 39
5.1 line
........................................................................................................................................................................ 39
5.2 modbus
........................................................................................................................................................................ 40
5.3 va
6Legacy CoolGate Mode 41
........................................................................................................................................................................ 41
6.1 DK .......................................................................................................................................................... 41DK PRO via Airnet address
.......................................................................................................................................................... 42DK PRO Outdoor Systems
.......................................................................................................................................................... 42DK PRO Outdoor Units

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Contents
Modbus Integration Guidelines
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Connection
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1 Connection
CoolAutomation devices support Modbus RTU and Modbus IP protocols with accordance to the Modbus
Organization specifications listed below:
· MODBUS Application Protocol Specification
· MODBUS over Serial Line Specification and Implementation Guide
· MODBUS Messaging on TCP/IP Implementation Guide
Modbus RTU is supported by CoolMasterNet, CooLinkNet and CooLinkHub, Modbus IP is supported by
CoolMasterNet and CooLinkHub.
1.1 Modbus RTU Connection
In Modbus RTU mode physical connection of the CoolAutomation devices is done over “Two-Wire” electrical
interface in accordance with EIA/TIA-485 standard. Connection is made via 485-A and 485-B terminals. Ground
wire connection is not mandatory but highly recommended.
CoolMasterNet Modbus RTU Connection
In CoolMasterNet Line L3 is recommended for Modbus RTU connection, although Lines L4, L5, L6 and L7 can also
be used for that purpose. Picture above shows connection to Line L3.

Connection
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CooLinkNet/CooLinkHub Modbus RTU Connection
In CooLinkNet/CooLinkHub only Line L3 can be used for Modbus RTU connection.
1.2 Modbus IP Connection
Modbus IP is supported in CoolMasterNet and CooLinkHub devices. Device acts as a Modbus Server,
communicating on the Ethernet TCP/IP network. Physical connection in this case is made via RJ45 Ethernet
connector.

Configuration
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2 Configuration
CoolAutomation device must be properly configured to support Modbus functionality. Configuration is made via
CoolAutomation's proprietary ASCII_IF interface described in details in Programmer Reference Manual (PRM)
document for the corresponding device.
It is allowed to have a number of simultaneous Modbus RTU and Modbus IP connections to the same device.
2.1 Modbus RTU Configuration
Modbus RTU interface module of the CoolAutomation device has to be activated by assigning appropriate
communication Line. In CoolMasterNet it is highly recommended to use Line L3, although it is possible to use any
of the L4, L5, L6, L7 lines. In CooLinkNet and CooLinkHub Line L3 usage for Modbus RTU is mandatory.
CoolMasterNet Modbus RTU activation:
CooLinkNet/CooLinkHub Modbus RTU activation:
>line type L3 CG5
OK, Boot Required!
>line type L3 CLMB
OK, Boot Required!
To check if Modbus RTU module is already activated and read it 's parameters, including Slave Address, line
command should be used:
CoolMasterNet:
CooLinkNet/CooLinkHub:
>line
L1: DK Master U00/G00 myid:0B
Tx:2/2 Rx:2/2 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L2: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L3: CG5 Modbus Address:0x50(80) 9600_8N1
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L4: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L5: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L6: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L7: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L8: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
OK
>line
L1: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L2: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L3: CLMB Address:0x50(80) 9600_8N1
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L4: M1M2 Slave U00/G00 Not Connected
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
L5: Unused
Tx:0/0 Rx:0/0 TO:0/0 CS:0/0 Col:0/0 NAK:0/0
OK
Next: For CoolMasterNet and CooLinkHub VA's have to be configured to use Modbus RTU module. See: VA's
Configuration.
2.1.1 Modbus Slave Address
Modbus Slave Address can be queried with line command or changed with line myid command. In the example
below the new Slave Address will become 0x51 (81 decimal) after power reset:
>line myid L3 51
OK, Boot Required!
The default (factory set) Modbus Slave Address for CoolAutomation devices is 0x50 hexadecimal (80 decimal).

Configuration
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2.1.2 Modbus RTU Frame Format
The default Modbus RTU frame format in CoolAutomation devices is 9600_8N1:
Baud Rate
9600 bps
Data Bits
8
Parity
None
Stop Bits
1
Frame format parameters are configurable with line baud command:
>line baud L3 19200_8N2
OK, Boot Required!
New frame format will be 19200 bps, 8 data bits, no parity, 2 stop bits.
2.2 Modbus IP Configuration
Modbus IP is supported in CoolMasterNet and CooLinkHub devices. CooLinkNet has no Modbus IP support.
Modbus IP module is activated with below command:
>modbus IP enable
OK, Boot Required!
Modbus IP server is started by device only after it establishes an Ethernet link and gets proper IP address
(dynamic via DHCP or static). Ethernet and IP management is done with ifconfig command that is out of the spec
of this document.
To query Modbus IP status use modbus command without parameters:
>modbus
ModBus IP : enabled
server port : 502
CG4/5 ignore : none
OK
The default TCP/IP port number used by Modbus IP Server is 502. This is "well-known" Ethernet port assigned for
the Modbus TCP/IP protocol. If required port number can be changed (new port number will be 503):
>modbus server port 503
OK, Boot Required!
Next: VA's have to be configured to use Modbus IP Server. See: VA's Configuration.
2.3 VA's Configuration
VA's are used in CoolMasterNet and CooLinkHub devices. For CooLinkNet device this chapter is not applicable.
VA's -Virtual Addresses are used in order to simplify translation of the Indoor Unit identifier/number - UID into
addresses of related Modbus objects: holding registers, input registers, coils and discrete inputs.
UID is a string in format Ln.XYY. For Example:
L1.102 - Indoor Unit 102 on line L1
L2.003 - Indoor Unit 003 on line L2
List of UID's detected (visible) by CoolAutomation device can be retrieved with ls command.

Configuration
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>ls
L1.100 ON 19C 30C High Fan OK # 0
L1.101 OFF 28C 23C High Cool OK - 0
Each UID can have none, one or a number of associated VA's. VA's are plain numbers starting from 1. Device can
automatically allocate and associate VA's with existing (visible by ls command) UID's:
>va auto
OK
To query allocated VA's use va command without parameters:
>va
INDOORS
L1.100 --> 0001 [Hex: 0x0011 | Dec: 00017]
L1.101 --> 0002 [Hex: 0x0021 | Dec: 00033]
OK
VA reporting string has following fields:
UID
Associated
VA
Base Address
Hex
Base Address
Decimal
L1.100
0001
0x0011
00017
Base Address is a starting address of the Modbus objects block related to VA and it's UID. Any operations with
Indoor Unit referenced by UID (query or change status) are made with Modbus objects from that block. Size of the
Modbus objects block for Indoor Unit is 16 adresses. Content of the Modbus objects block is described in
CoolMasterNet Tables.
Base Address is calculated as: Base Address = VA*16 +1
Below example shows relation between UID, VA, Base Address and Modbus objects
UID
VA
Base
Address
Modbus Objects Block
Discrete
Inputs
Coils
Input
Registers
Holding
Registers
L1.100
0001
0x0011 --->
0x0011
0x0011
0x0011
0x0011
...
...
...
...
0x0020
0x0020
0x0020
0x0020
L1.101
0002
0x0021 --->
0x0021
0x0021
0x0021
0x0021
...
...
...
...
0x0030
0x0030
0x0030
0x0030
VA's can be allocated or deallocated (deleted) all together or separately. As shown above for automatic VA's
allocation va auto command is used. It is possible to allocate VA for specific UID. For example, allocate VA 0004
for UID L1.102:
>va + L1.102 0004
OK
In this case UID does not have to be detected (visible) by CoolAutomation device at the VA allocation time. It is
allowed to allocate a number of VA's for any given UID.
To delete all allocated VA's:

Configuration
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>va delall
OK
Specific VA can also be deleted (below command will delete VA 0004):
>va - 0004
OK
Alternatively all VA's associated with specific UID can be deleted (below command will delete all VA's associated
with UID L1.102):
>va - L1.102
OK
Once VA's are allocated Modbus RTU and Modbus IP can be properly used to access Indoor Unit parameters via
associated VA's.

Modbus Tables
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3 Modbus Tables
Supported Modbus Exception Codes
Exception Code
Exception Name
0x01 (01)
Illegal Function
0x02 (02)
Illegal Data Address
0x03 (03)
Illegal Data Value
0x04 (04)
Server Device Failure
0x05 (05)
Acknowledgment
0x06 (06)
Server Device Busy
0x0A (10)
Gateway Path Unavailable
3.1 CoolMasterNet Modbus Tables
Supported Modbus functions
Function Code
Function Definition
Dec
Hex
1
0x01
Read Coils
2
0x02
Read Discrete Inputs
3
0x03
Read Holding Registers
4
0x04
Read Input Register
5
0x05
Write Single Coil
6
0x06
Write Single Register
15
0x0F
Write Single Coil
16
0x10
Write Multiple Registers

Modbus Tables
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Indoor Unit Modbus objects block
Base
Address
Holding Registers
Input Registers
Coils
Discrete Inputs
+0
Operation Mode
0-Cool
4-HAUX
8-VAMAuto
1-Heat
5-Fan
9-VAMBypass
2-Auto
6-HH
10-VAMHeat Exc
3-Dry
11-VAMNormal
UID Ln.XYY
Bits
15..12
Bits
11..8
Bits
7..0
Ln
X
YY
On/Off
0-OFF
1-ON
Reserved
+1
Fan Speed
0-Low
3-Auto
1-Med
4-Top
7-VAMSuper Hi
2-High
5-Very Lo
8-VAMLo FreshUp
9-VAMHi FreshUp
Room Temperature
x10 °C
Filter Sign
+2
Set Temperature x10 °C
HVAC Malfunction
Code String2
First two characters
External Terminals
Status
(Read Only)
0-Open, 1-Closed (short)
+3
On/Off
0-OFF
1-ON
HVAC Malfunction
Code String2
Last two characters
Inhibit4
+4
Filter Sign
Reserved
Reserved
+5
Swing
0-Vertical
1-30 deg
5-Auto
4-Horizontal
2-45 deg
6-OFF
3-60 deg
+6
Room Temperature x10 °C
(Read Only)
+7
HVAC Malfunction Code
(Read Only)
+8
Local Wall Controller
Lock Bits3
LSB
Bit 0 - Inhibit On/Off control
Bit 1 - Inhibit Mode control
Bit 2 - Inhibit Set Temperature control
Bit 7 - Inhibit All control operations
+9
Set Temperature Limits1
v0.4.4
Digital Output 1
Digital Input 1
+10 0xA
Reserved
Digital Output 2
Digital Input 2
+11 0xB
Digital Output 3
Digital Input 3
+12 0xC
Digital Output 4
Digital Input 4
+13 0xD
Analog Input 1
Digital Output 5
Digital Input 5
+14 0xE
Analog Input 2
Digital Output 6
Digital Input 6
+15 0xF
Reserved
Reserved
Reserved
1Set Temperature Limits Encoding

Modbus Tables
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MSB Bits 15..8
LSB
Bits 7..0
High Limit x2
Low Limit x2
For example, 0x4020 means
High Limit = 0x40/2 = 32(decimal)
Low Limit = 0x20/2 = 16(decimal)
Zero value of High Limit or Low Limit means that corresponding limit is not in use.
2HVAC Malfunction Code String Encoding
This parameter is a HVAC malfunction code in string format, same as reported by ls command. Here are some
examples:
Malfunction Code
String
Input Register Values
0
"OK VV "
0x4F4B, 0x2020
6608
"6608"
0x3636, 0x3038
3Locks compatibility
Lock type
Compatible
HVAC Model
Notes
Inhibit On/Off control
DK, SA, TO, PN
Inhibit Mode control
DK, SA, TO, PN,
MD, TR, KT, CG
v0.4.9
Inhibit Set Temperature control
DK, SA, TO, PN
Inhibit All control operations
HT, MD, TR, KT, CG
v0.4.7
4Inhibit
Writing this coil activates or deactivates (according to value 1 or 0) inhibit of the indoor unit ON operation. Upon
inhibit activation current ON/OFF status of the indoor unit is stored and indoor unit is unconditionally turned OFF
after about 8s delay. Indoor unit will be forced OFF until inhibit deactivation. On inhibit deactivation indoor unit will
be turned ON if ON status was previously stored at inhibit activation. This function is oriented to work with window
sensor to prevent HVAC operation while window is open.
3.1.1 Special Devices
· PAC YG66
This device supports Digital Inputs 1..6 and Digital Outputs 1..6 accessed via corresponding Coils and Discrete
Inputs listed in "Indoor Unit Modbus objects block" table.
· PAC YG63
This device supports Analog Inputs 1,2 accessed via corresponding Inputs Registers listed in "Indoor Unit Modbus
objects block" table. The actual Analog Input value should be calculated as
Analog Input Value = Input Register Value / 10
For example if temperature sensor is connected to Analog Input 1 of PAC YG63 and Analog Input 1 Input Register
is read as 275 the temperature is 275/10 = 27.5
3.2 CooLinkNet Modbus Tables
Supported Modbus functions
Function Code
Function Definition
Dec
Hex

Modbus Tables
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3
0x03
Read Holding Registers
6
0x06
Write Single Register
16
0x10
Write Multiple Registers
Holding Reg
Address*
Description
Read
Write
Required**
Notes
Hex
Dec
Version
Model
CooLinkNet Internals
0001
1
CooLinkNet Version
R
Major*100 + Minor*10 + SubMinor
0002
2
CooLinkNet S/N
R
Lower 16 bit
0003
3
CooLinkNet Model
R
Two ASCIIcharacters
0004
4
Modbus Address
RW
Modbus Address change is
effective only after reset
0005
5
Reset
W
1 - Enter Boot mode
CooLinkNet does not respond to
the write request to this register
2 - Reset
0010
16
Internal State
· 0 - Not Connected to RC line
· 1 - Connecting
· 2 - Connected as single RC
· 3 - Connected as Master RC. Detected
Slave RC
· 4 - Connected as Slave RC
R
0011
17
0 - Master Mode (default) 1 - Slave Mode
RW
0.0.4
0021
33
UID
R
MSB - X, LSB - YY
Indoor Status and Control
0100
256
On/Off 0-Off, 1-On
RW
0101
257
Operation Mode
0-Cool
3-Dry
1-Heat
4-HAUX
2-Auto
5-Fan
RW
0102
258
Fan Speed
0-Low
3-Auto
1-Med
4-Top
2-High
RW
0103
259
Set Point °C
RW
0104
260
Failure Code
R
0105
261
Indoor Ambient Temperature °C
R
MSB - Integer Part
LSB - Fraction Part * 0.01
0110
272
Feed Temperature °C
RW
0.2.4
0xFFFF - disable feed
* If Version or Model is not specified, it means that register is supported in any CooLinkNet version and/or model.
3.3 HVAC Malfunction Codes
The value read from "HVAC Malfunction Code" holding register can be translated into native malfunction code
applicable for specific HVAC manufacturer. In most cases that value and native code are equal but for some HVAC
models translation to alphanumeric representation required. Following tables can be used for such translation.
Zero value (0x00) means that there are no HVAC malfunctions.

Modbus Tables
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HVAC Type
Native Malfunction Code Format
DK
XX (see DK type HVAC malfunction codes translation table)
PN, SA, TO
Xnn (see PN, SA, TO type HVAC malfunction codes translation table)
ME
nnnn decimal
GR
HH hexadecimal (low nibble or high nibble)
LG
nn decimal
MG,TR,KT,CG
EH if code == 0x1H
PH if code == 0x2H
H# if code == 0x3H
SM
nnn decimal
Others
HH hexadecimal
DK type HVAC malfunction codes translation table
000 (0x00) - OK 001 (0x01) - 01 002 (0x02) - 02 003 (0x03) - 03
004 (0x04) - 04 005 (0x05) - 05 006 (0x06) - 06 007 (0x07) - 07
008 (0x08) - 08 009 (0x09) - 09 010 (0x0A) - 0A 011 (0x0B) - 0H
012 (0x0C) - 0C 013 (0x0D) - 0J 014 (0x0E) - 0E 015 (0x0F) - 0F
016 (0x10) - A0 017 (0x11) - A1 018 (0x12) - A2 019 (0x13) - A3
020 (0x14) - A4 021 (0x15) - A5 022 (0x16) - A6 023 (0x17) - A7
024 (0x18) - A8 025 (0x19) - A9 026 (0x1A) - AA 027 (0x1B) - AH
028 (0x1C) - AC 029 (0x1D) - AJ 030 (0x1E) - AE 031 (0x1F) - AF
032 (0x20) - C0 033 (0x21) - C1 034 (0x22) - C2 035 (0x23) - C3
036 (0x24) - C4 037 (0x25) - C5 038 (0x26) - C6 039 (0x27) - C7
040 (0x28) - C8 041 (0x29) - C9 042 (0x2A) - CA 043 (0x2B) - CH
044 (0x2C) - CC 045 (0x2D) - CJ 046 (0x2E) - CE 047 (0x2F) - CF
048 (0x30) - E0 049 (0x31) - E1 050 (0x32) - E2 051 (0x33) - E3
052 (0x34) - E4 053 (0x35) - E5 054 (0x36) - E6 055 (0x37) - E7
056 (0x38) - E8 057 (0x39) - E9 058 (0x3A) - EA 059 (0x3B) - EH
060 (0x3C) - EC 061 (0x3D) - EJ 062 (0x3E) - EE 063 (0x3F) - EF
064 (0x40) - H0 065 (0x41) - H1 066 (0x42) - H2 067 (0x43) - H3
068 (0x44) - H4 069 (0x45) - H5 070 (0x46) - H6 071 (0x47) - H7
072 (0x48) - H8 073 (0x49) - H9 074 (0x4A) - HA 075 (0x4B) - HH
076 (0x4C) - HC 077 (0x4D) - HJ 078 (0x4E) - HE 079 (0x4F) - HF
080 (0x50) - F0 081 (0x51) - F1 082 (0x52) - F2 083 (0x53) - F3
084 (0x54) - F4 085 (0x55) - F5 086 (0x56) - F6 087 (0x57) - F7
088 (0x58) - F8 089 (0x59) - F9 090 (0x5A) - FA 091 (0x5B) - FH
092 (0x5C) - FC 093 (0x5D) - FJ 094 (0x5E) - FE 095 (0x5F) - FF
096 (0x60) - J0 097 (0x61) - J1 098 (0x62) - J2 099 (0x63) - J3
100 (0x64) - J4 101 (0x65) - J5 102 (0x66) - J6 103 (0x67) - J7
104 (0x68) - J8 105 (0x69) - J9 106 (0x6A) - JA 107 (0x6B) - JH
108 (0x6C) - JC 109 (0x6D) - JJ 110 (0x6E) - JE 111 (0x6F) - JF
112 (0x70) - L0 113 (0x71) - L1 114 (0x72) - L2 115 (0x73) - L3

Modbus Tables
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116 (0x74) - L4 117 (0x75) - L5 118 (0x76) - L6 119 (0x77) - L7
120 (0x78) - L8 121 (0x79) - L9 122 (0x7A) - LA 123 (0x7B) - LH
124 (0x7C) - LC 125 (0x7D) - LJ 126 (0x7E) - LE 127 (0x7F) - LF
128 (0x80) - P0 129 (0x81) - P1 130 (0x82) - P2 131 (0x83) - P3
132 (0x84) - P4 133 (0x85) - P5 134 (0x86) - P6 135 (0x87) - P7
136 (0x88) - P8 137 (0x89) - P9 138 (0x8A) - PA 139 (0x8B) - PH
140 (0x8C) - PC 141 (0x8D) - PJ 142 (0x8E) - PE 143 (0x8F) - PF
144 (0x90) - U0 145 (0x91) - U1 146 (0x92) - U2 147 (0x93) - U3
148 (0x94) - U4 149 (0x95) - U5 150 (0x96) - U6 151 (0x97) - U7
152 (0x98) - U8 153 (0x99) - U9 154 (0x9A) - UA 155 (0x9B) - UH
156 (0x9C) - UC 157 (0x9D) - UJ 158 (0x9E) - UE 159 (0x9F) - UF
160 (0xA0) - M0 161 (0xA1) - M1 162 (0xA2) - M2 163 (0xA3) - M3
164 (0xA4) - M4 165 (0xA5) - M5 166 (0xA6) - M6 167 (0xA7) - M7
168 (0xA8) - M8 169 (0xA9) - M9 170 (0xAA) - MA 171 (0xAB) - MH
172 (0xAC) - MC 173 (0xAD) - MJ 174 (0xAE) - ME 175 (0xAF) - MF
176 (0xB0) - 30 177 (0xB1) - 31 178 (0xB2) - 32 179 (0xB3) - 33
180 (0xB4) - 34 181 (0xB5) - 35 182 (0xB6) - 36 183 (0xB7) - 37
184 (0xB8) - 38 185 (0xB9) - 39 186 (0xBA) - 3A 187 (0xBB) - 3H
188 (0xBC) - 3C 189 (0xBD) - 3J 190 (0xBE) - 3E 191 (0xBF) - 3F
192 (0xC0) - 40 193 (0xC1) - 41 194 (0xC2) - 42 195 (0xC3) - 43
196 (0xC4) - 44 197 (0xC5) - 45 198 (0xC6) - 46 199 (0xC7) - 47
200 (0xC8) - 48 201 (0xC9) - 49 202 (0xCA) - 4A 203 (0xCB) - 4H
204 (0xCC) - 4C 205 (0xCD) - 4J 206 (0xCE) - 4E 207 (0xCF) - 4F
208 (0xD0) - 50 209 (0xD1) - 51 210 (0xD2) - 52 211 (0xD3) - 53
212 (0xD4) - 54 213 (0xD5) - 55 214 (0xD6) - 56 215 (0xD7) - 57
216 (0xD8) - 58 217 (0xD9) - 59 218 (0xDA) - 5A 219 (0xDB) - 5H
220 (0xDC) - 5C 221 (0xDD) - 5J 222 (0xDE) - 5E 223 (0xDF) - 5F
224 (0xE0) - 60 225 (0xE1) - 61 226 (0xE2) - 62 227 (0xE3) - 63
228 (0xE4) - 64 229 (0xE5) - 65 230 (0xE6) - 66 231 (0xE7) - 67
232 (0xE8) - 68 233 (0xE9) - 69 234 (0xEA) - 6A 235 (0xEB) - 6H
236 (0xEC) - 6C 237 (0xED) - 6J 238 (0xEE) - 6E 239 (0xEF) - 6F
240 (0xF0) - ?0 241 (0xF1) - ?1 242 (0xF2) - ?2 243 (0xF3) - ?3
244 (0xF4) - ?4 245 (0xF5) - ?5 246 (0xF6) - ?6 247 (0xF7) - ?7
248 (0xF8) - ?8 249 (0xF9) - ?9 250 (0xFA) - ?A 251 (0xFB) - ?H
252 (0xFC) - ?C 253 (0xFD) - ?J 254 (0xFE) - ?E 255 (0xFF) - ?F
PN, SA, TO type HVAC malfunction codes translation table
000 (0x00) - OK 001 (0x01) - A01 002 (0x02) - A02 003 (0x03) - A03
004 (0x04) - A04 005 (0x05) - A05 006 (0x06) - A06 007 (0x07) - A07

Modbus Tables
Modbus Integration Guidelines Rev 0.5 16
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008 (0x08) - A08 009 (0x09) - A09 010 (0x0A) - A10 011 (0x0B) - A11
012 (0x0C) - A12 013 (0x0D) - A13 014 (0x0E) - A14 015 (0x0F) - A15
016 (0x10) - A16 017 (0x11) - A17 018 (0x12) - A18 019 (0x13) - A19
020 (0x14) - A20 021 (0x15) - A21 022 (0x16) - A22 023 (0x17) - A23
024 (0x18) - A24 025 (0x19) - A25 026 (0x1A) - A26 027 (0x1B) - A27
028 (0x1C) - A28 029 (0x1D) - A29 030 (0x1E) - A30 031 (0x1F) - A31
032 (0x20) - C00 033 (0x21) - C01 034 (0x22) - C02 035 (0x23) - C03
036 (0x24) - C04 037 (0x25) - C05 038 (0x26) - C06 039 (0x27) - C07
040 (0x28) - C08 041 (0x29) - C09 042 (0x2A) - C10 043 (0x2B) - C11
044 (0x2C) - C12 045 (0x2D) - C13 046 (0x2E) - C14 047 (0x2F) - C15
048 (0x30) - C16 049 (0x31) - C17 050 (0x32) - C18 051 (0x33) - C19
052 (0x34) - C20 053 (0x35) - C21 054 (0x36) - C22 055 (0x37) - C23
056 (0x38) - C24 057 (0x39) - C25 058 (0x3A) - C26 059 (0x3B) - C27
060 (0x3C) - C28 061 (0x3D) - C29 062 (0x3E) - C30 063 (0x3F) - C31
064 (0x40) - E00 065 (0x41) - E01 066 (0x42) - E02 067 (0x43) - E03
068 (0x44) - E04 069 (0x45) - E05 070 (0x46) - E06 071 (0x47) - E07
072 (0x48) - E08 073 (0x49) - E09 074 (0x4A) - E10 075 (0x4B) - E11
076 (0x4C) - E12 077 (0x4D) - E13 078 (0x4E) - E14 079 (0x4F) - E15
080 (0x50) - E16 081 (0x51) - E17 082 (0x52) - E18 083 (0x53) - E19
084 (0x54) - E20 085 (0x55) - E21 086 (0x56) - E22 087 (0x57) - E23
088 (0x58) - E24 089 (0x59) - E25 090 (0x5A) - E26 091 (0x5B) - E27
092 (0x5C) - E28 093 (0x5D) - E29 094 (0x5E) - E30 095 (0x5F) - E31
096 (0x60) - F00 097 (0x61) - F01 098 (0x62) - F02 099 (0x63) - F03
100 (0x64) - F04 101 (0x65) - F05 102 (0x66) - F06 103 (0x67) - F07
104 (0x68) - F08 105 (0x69) - F09 106 (0x6A) - F10 107 (0x6B) - F11
108 (0x6C) - F12 109 (0x6D) - F13 110 (0x6E) - F14 111 (0x6F) - F15
112 (0x70) - F16 113 (0x71) - F17 114 (0x72) - F18 115 (0x73) - F19
116 (0x74) - F20 117 (0x75) - F21 118 (0x76) - F22 119 (0x77) - F23
120 (0x78) - F24 121 (0x79) - F25 122 (0x7A) - F26 123 (0x7B) - F27
124 (0x7C) - F28 125 (0x7D) - F29 126 (0x7E) - F30 127 (0x7F) - F31
128 (0x80) - H00 129 (0x81) - H01 130 (0x82) - H02 131 (0x83) - H03
132 (0x84) - H04 133 (0x85) - H05 134 (0x86) - H06 135 (0x87) - H07
136 (0x88) - H08 137 (0x89) - H09 138 (0x8A) - H10 139 (0x8B) - H11
140 (0x8C) - H12 141 (0x8D) - H13 142 (0x8E) - H14 143 (0x8F) - H15
144 (0x90) - H16 145 (0x91) - H17 146 (0x92) - H18 147 (0x93) - H19
148 (0x94) - H20 149 (0x95) - H21 150 (0x96) - H22 151 (0x97) - H23
152 (0x98) - H24 153 (0x99) - H25 154 (0x9A) - H26 155 (0x9B) - H27
156 (0x9C) - H28 157 (0x9D) - H29 158 (0x9E) - H30 159 (0x9F) - H31
160 (0xA0) - J00 161 (0xA1) - J01 162 (0xA2) - J02 163 (0xA3) - J03

Modbus Tables
Modbus Integration Guidelines Rev 0.5 17
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164 (0xA4) - J04 165 (0xA5) - J05 166 (0xA6) - J06 167 (0xA7) - J07
168 (0xA8) - J08 169 (0xA9) - J09 170 (0xAA) - J10 171 (0xAB) - J11
172 (0xAC) - J12 173 (0xAD) - J13 174 (0xAE) - J14 175 (0xAF) - J15
176 (0xB0) - J16 177 (0xB1) - J17 178 (0xB2) - J18 179 (0xB3) - J19
180 (0xB4) - J20 181 (0xB5) - J21 182 (0xB6) - J22 183 (0xB7) - J23
184 (0xB8) - J24 185 (0xB9) - J25 186 (0xBA) - J26 187 (0xBB) - J27
188 (0xBC) - J28 189 (0xBD) - J29 190 (0xBE) - J30 191 (0xBF) - J31
192 (0xC0) - L00 193 (0xC1) - L01 194 (0xC2) - L02 195 (0xC3) - L03
196 (0xC4) - L04 197 (0xC5) - L05 198 (0xC6) - L06 199 (0xC7) - L07
200 (0xC8) - L08 201 (0xC9) - L09 202 (0xCA) - L10 203 (0xCB) - L11
204 (0xCC) - L12 205 (0xCD) - L13 206 (0xCE) - L14 207 (0xCF) - L15
208 (0xD0) - L16 209 (0xD1) - L17 210 (0xD2) - L18 211 (0xD3) - L19
212 (0xD4) - L20 213 (0xD5) - L21 214 (0xD6) - L22 215 (0xD7) - L23
216 (0xD8) - L24 217 (0xD9) - L25 218 (0xDA) - L26 219 (0xDB) - L27
220 (0xDC) - L28 221 (0xDD) - L29 222 (0xDE) - L30 223 (0xDF) - L31
224 (0xE0) - P00 225 (0xE1) - P01 226 (0xE2) - P02 227 (0xE3) - P03
228 (0xE4) - P04 229 (0xE5) - P05 230 (0xE6) - P06 231 (0xE7) - P07
232 (0xE8) - P08 233 (0xE9) - P09 234 (0xEA) - P10 235 (0xEB) - P11
236 (0xEC) - P12 237 (0xED) - P13 238 (0xEE) - P14 239 (0xEF) - P15
240 (0xF0) - P16 241 (0xF1) - P17 242 (0xF2) - P18 243 (0xF3) - P19
244 (0xF4) - P20 245 (0xF5) - P21 246 (0xF6) - P22 247 (0xF7) - P23
248 (0xF8) - P24 249 (0xF9) - P25 250 (0xFA) - P26 251 (0xFB) - P27
252 (0xFC) - P28 253 (0xFD) - P29 254 (0xFE) - P30 255 (0xFF) - P31

PRO Functionality
Modbus Integration Guidelines Rev 0.5 18
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4 PRO Functionality
· PRO Indoor Units Base Address calculation:
Base Address = VA * 16 +1
· PRO Outdoor Systems and Outdoor Units Base Address calculation:
Base Address = 16401 + ((VA-1025) * 64)
4.1 PRO Modbus Tables
Supported Modbus functions
Function Code
Function Definition
Dec
Hex
4
0x04
Read Input Register
4.1.1 DK
4.1.1.1 DK PRO Indoor Units
Base
Address
Input Registers
+0
Suction Temperature x10 °C
+1
Liquid Pipe Temperature x10 °C
+2
Gas Pipe Temperature x10 °C
+3
EV Opening
+4
HVAC Malfunction Code
+5
Set Temperature °C
+6
Bitfields:
LSB
Bit 0 - 0-OFF, 1-ON
Bit 1 - Thermostat_ON(demand)
4.1.1.2 DK PRO Outdoor Systems
· VRV4S1, VRV4S2, VRV-3S, VRV-M, VRV-3P
Base
Address
Input Registers
Short Name
Description
+0
Type
Type Code = 8 - VRV4S1
Type Code = 9 - VRV4S2
Type Code = 4 - VRV-3S
Type Code = 11 - VRV-M
Type Code = 1 - VRV-3P
+1
AirNet
AirNet
+2
SysHP
System_HP
+3
SysCur
System_Current
+4
TrgtEvT
Target_evaporationg_temp.

PRO Functionality
Modbus Integration Guidelines Rev 0.5 19
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Base
Address
Input Registers
Short Name
Description
+5
TrgtCndT
Target_condensing_temp.
+6
ErrCode
Error_code
+7
Cool
Heat
Vent
TstatOn
ResrtStby
BkpOp
Bitfields:
Bit 0 - Cooling
Bit 1 - Heating
Bit 2 - Ventilation
Bit 3 - Thermostat_ON
Bit 4 - Restart_stand-by
Bit 7 - Backup_ope.
+8
DmndState
Demand_state
· VRV4S3, VRVX, VRV4-EU
Base
Address
Input Registers
Short Name
Description
+0
Type
Type Code = 10 - VRV4S3
Type Code = 6 - VRVX
Type Code = 7 - VRV4-EU
+1
AirNet
AirNet
+2
SysHP
System_HP
+3
SysCur
System_Current
+4
TrgtEvT
Target_evaporationg_temp.
+5
TrgtCndT
Target_condensing_temp.
+6
ErrCode
Error_code
+7
Cool
Heat
Vent
TstatOn
ResrtStby
Dfrst
StrtupCtl
BkpOp
OiRtrn
Bitfields:
Bit 0 - Cooling
Bit 1 - Heating
Bit 2 - Ventilation
Bit 3 - Thermostat_ON
Bit 4 - Restart_stand-by
Bit 5 - Defrost
Bit 6 - Startup_control
Bit 7 - Backup_ope.
Bit 9 - Oil_return
+8
DmndState
Demand_state
+9
OpCtlMod
Operation_control_mode
+10
TstatOnCap
I/U_thermostat_ON_capacity
· VRV-3R, VRV3C
Base
Address
Input Registers
Short Name
Description
+0
Type
Type Code = 5 - VRV-3R
Type Code = 2 - VRV3C
+1
AirNet
AirNet
+2
SysHP
System_HP
+3
SysCur
System_Current
+4
TrgtEvT
Target_evaporationg_temp.
+5
TrgtCndT
Target_condensing_temp.
+6
ErrCode
Error_code

PRO Functionality
Modbus Integration Guidelines Rev 0.5 20
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Base
Address
Input Registers
Short Name
Description
+7
Cool
Heat
Vent
TstatOn
ResrtStby
BkpOp
CoolHeatPrll
Bitfields:
Bit 0 - Cooling
Bit 1 - Heating
Bit 2 - Ventilation
Bit 3 - Thermostat_ON
Bit 4 - Restart_stand-by
Bit 7 - Backup_ope.
Bit 8 - Cool/Heat_parallel_ope.
+8
DmndState
Demand_state
· VRV-4R
Base
Address
Input Registers
Short Name
Description
+0
Type
Type Code = 3 - VRV-4R
+1
AirNet
AirNet
+2
SysHP
System_HP
+3
SysCur
System_Current
+4
TrgtEvT
Target_evaporationg_temp.
+5
TrgtCndT
Target_condensing_temp.
+6
ErrCode
Error_code
+7
Cool
Heat
Vent
TstatOn
ResrtStby
Dfrst
StrtupCtl
BkpOp
CoolHeatPrll
OiRtrn
Bitfields:
Bit 0 - Cooling
Bit 1 - Heating
Bit 2 - Ventilation
Bit 3 - Thermostat_ON
Bit 4 - Restart_stand-by
Bit 5 - Defrost
Bit 6 - Startup_control
Bit 7 - Backup_ope.
Bit 8 - Cool/Heat_parallel_ope.
Bit 9 - Oil_return
+8
DmndState
Demand_state
+9
OpCtlMod
Operation_control_mode
+10
TstatOnCap
I/U_thermostat_ON_capacity
4.1.1.3 DK PRO Outdoor Units
· VRV4S1, VRV4S2, VRV-3S, VRV-3P
Base
Address
Input Registers
Short Name
Description
+0
Type
Type Code = 11 - VRV4S1
Type Code = 12 - VRV4S2
Type Code = 5 - VRV-3S
Type Code = 1 - VRV-3P
+1
AirNet
AirNet
+2
HP
HP
+3
AmbT
Ambient_temp.
+4
SuctT
Suction_temp.