Modbus RTU
Modbus RTU Configuration
CoolMasterNet Modbus RTU is activated with below command:
|
>line type L3 CG5 |
CoolMasterNet has to be restarted to run Modbus RTU for the first time.
To quire current Modbus RTU configuration use line command:
| {{{1}}} |
Virtual Address (VA) Concept
In order to simplify translation of the UID (like L5.102) into Modbus object address, CoolMasterNet uses VA, associated with UID. Each UID can have none, one or a number of associated VA's. VA's are plain numbers starting from 001 (decimal). To let CoolMasterNet automatically associate VA's with existing (visible with ls command) UID's run:
|
>va auto |
This command will delete all existing associations and will create new associations one to one (one VA to one UID). At any time VA associations list can be retrieved with plain va command:
|
>va |
Hex and Dec numbers printed after VA 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 L1.102 has associated VA = 002, thus Base Address = 2*16+1 = 33.
Discrete Inputs, Coils and Registers
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 | 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 Bits 15..12 |
Bits 11..8 |
LSB Bits 7..0 |
| Ln | X | YY |
Corresponds to Ln.XYY (like for example L1.102)
Operation Mode Encoding
| 0 - Cool | 1 - Heat | 2 - Auto | 3 - Dry |
| 4 - HAUX | 5 - Fan | 6 - HH | |
| 8 - VAM Auto | 9 - VAM Bypass | 10 - VAM Heat Exch. | 11 - VAM Normal |
Fan Speed Encoding
| 0 - Low | 1 - Medium | 2 - High |
| 3 - Auto | 4 - Top | 5 - Very Low |
| 7 - VAM Super High | 8 - VAM Low Fresh Up | |
| 9 - VAM High Fresh Up |
Swing Encoding
| 0 - Vertical | 1 - 30 deg | 2 - 45 deg | 3 - 60 deg |
| 4 - Horizontal | 5 - Auto | 6 - OFF |
