CoolAutomation CoolMasterNet, Manual, Page: 11 / 47

Connections
CoolMasterNet PRM Rev 0.7
11
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4.5.3 CoolGate 5
CoolMasterNet can be used as a ModBus RTU slave device working in accordance with Modbus-IDA.ORG
"MODBUS over serial line specification and implementation guide". RS485 default frame format is (can be
changed with
line baud command)
Baud Rate 9600
Data Bits 8
Parity Control None
Stop Bits 1
Flow Control None
CoolGate 5 Indoors Address Map:
In order to simplify translation of the
UID (like L1.100) into ModBus object address, CoolMasterNet uses VA ,
associated with UID. Hex and Dec numbers printed after va command are Base Address used to access
ModBus objects related to UID-VA association. Base Address can be calculated as BaseAddress = VA*16 + 1.
For example Indoor Unit L1.100 has associated
VA = 007 , thus Base Address = 7*16+1 = 113 (0x71).
Once the Base Address is determined, access to the specific Indoor Unit parameter(s) is done via Modbus
objects listed below.
Base
Address
Discrete
Inputs
Coils
Holding
Registers
Input
Registers
+0
Reserved
On/Off Operation Mode UID
+1 Filter Sign Fan Speed Room Temperature x10
+2
Reserved
Set Temperature x10
Failure Code String first
two characters
+3 On/Off
Failure Code String last
two characters
+4 Filter Sign
Reserved
+5 Swing
+6
Room Temperature x10
(RO)
+7 Failure Code (RO)
+8 Lock Bits
+9 Digital Input 1 Digital Output 1
Reserved
+10 Digital Input 2 Digital Output 2
+11 Digital Input 3 Digital Output 3
+12 Digital Input 4 Digital Output 4
+13 Digital Input 5 Digital Output 5 Analog Input 1
+14 Digital Input 6 Digital Output 6 Analog Input 2
+15 Reserved Reserved Reserved
UID Encoding
MSB LSB
Bits 15..12
Bits 11..8
Bits 7..0
Ln X YY
Corresponds to Ln.XYY (like for example L1.100)
Operation Mode Encoding