Difference between revisions of "MODBUS AIO"
| Line 69: | Line 69: | ||
The Modbus Type represents 8 bits, those 8 bits will tell you which data (temperature, humidity etc) will be taken from the Modbus thermostat or from the Micro CAN connected sensors. | The Modbus Type represents 8 bits, those 8 bits will tell you which data (temperature, humidity etc) will be taken from the Modbus thermostat or from the Micro CAN connected sensors. | ||
| − | + | Modbus Type: | |
*.BIT7: =0->Modbus VOC is used, =1->uCAN VOC is used | *.BIT7: =0->Modbus VOC is used, =1->uCAN VOC is used | ||
*.BIT6: =0->Modbus CO2 is used, =1->uCAN CO2 is used | *.BIT6: =0->Modbus CO2 is used, =1->uCAN CO2 is used | ||
| Line 78: | Line 78: | ||
*.BIT1: | *.BIT1: | ||
*.BIT0: | *.BIT0: | ||
| + | |||
| + | We've a thermostat that uses temperature, humidity and CO2. However, we will only use temperature and humidity from the Modbus thermostat (thus thermostat type = 0d11001111 = 207) | ||
ThermostatMode: | ThermostatMode: | ||
Revision as of 12:46, 26 December 2019
Contents
Introduction
The AIO design also supports Modbus thermostats directly connected to the Micro CAN. This enables physical Modbus thermostats to be seamlessly integrated in the Openmotics system and allow users to control their thermostats online, by mobile app and by physical thermostats.
These are the possibilities of the physical thermostat supported by Openmotics:
- Allows to set the setpoint of a room
- Allows to change the mode (vacation, auto, party etc)
- Change between heating and cooling
- Uses the internal temperature sensor as sensor probe for the Openmotics system
Supported Modbus thermostats
Today, only Openmotics Modbus thermostats are supported but more thermostats will be supported in the future.
How to connect the Modbus thermostat
Following is needed to connect a Modbus thermostat:
- An installed Micro CAN
- An Openmotics Modbus cable
- An Openmotics Modbus thermostat
The Modbus thermostat will be connected to the Openmotics Micro CAN by using the Openmotics Modbus cable that converts the UART output of the Micro CAN to a modbus signal.
The Micro CAN will communicate with the Modbus thermostat and will read the temperature of the thermostat, is able to read and set the thermostat setpoint and read/set the thermostat mode.
How to configure the system after connecting a Modbus Thermostat
Step1: Find the Micro CAN ID
In the following steps, we need to know the ID of the Micro CAN on which the Modbus thermostat is connected. Each Micro CAN needs at least 1 switch.
First, use following CLI instruction:
input debug on
Press the switch connected to the Micro CAN that has the connected Modbus thermostat. In this example, I got following CLI return:
Input Nr 13 has been pressed
Now, do the following CLI instruction:
can ping list
Following return:
Nr-ID2.ID1.ID0--Inp.link0-Inp.link1-Inp.link2-Inp.link3-Inp.link4-Inp.link5-Tem.link0-Tem.link1-Type-Firmware-Boot-ID_NE-Modbus-Type-Min-MAX-delay--Volt-- 00 008.228.145 008(000) 255(255) 255(255) 255(255) 255(255) 255(255) 008(000) 255(255) 044 F2.0.44 255 069 005 072 000 255 015ms 12.14V 01 238.081.226 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 02 154.043.222 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 03 140.120.075 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 04 172.084.031 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 05 100.166.094 013(005) 014(006) 255(255) 255(255) 255(255) 255(255) 255(255) 255(255) 000 F2.0.50 255 069 255 255 000 255 017ms 11.98V
In the above example, check for all Micro CAN's the Inp.link0..5 and look for 13 (value not between brackets). In our example, we've found ID 100.166.94 containing input 13.
Step 2: Configure the Modbus ID
We're using a thermostat that responds to Modbus ID 1. This needs to be programmed in the Micro CAN by using following CLI instruction:
basic action activate 20 26 100 166 94 1
To check if the instruction has been programmed in the Micro CAN, use again the CAN ping instruction:
ping can list
Return:
Nr-ID2.ID1.ID0--Inp.link0-Inp.link1-Inp.link2-Inp.link3-Inp.link4-Inp.link5-Tem.link0-Tem.link1-Type-Firmware-Boot-ID_NE-Modbus-Type-Min-MAX-delay--Volt-- 00 008.228.145 008(000) 255(255) 255(255) 255(255) 255(255) 255(255) 008(000) 255(255) 044 F2.0.44 255 069 004 128 000 255 015ms 12.10V 01 238.081.226 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 02 154.043.222 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 03 140.120.075 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 04 172.084.031 NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA(NA) NA NA NA NA NA NA NA NA >500ms NA 05 100.166.094 013(005) 014(006) 255(255) 255(255) 255(255) 255(255) 255(255) 255(255) 000 F2.0.50 255 069 001 255 000 255 017ms 3.46V OK
As you can see, in the column Modbus, you see address 1 for our Micro CAN
Configure the Modbus Type
The Modbus Type represents 8 bits, those 8 bits will tell you which data (temperature, humidity etc) will be taken from the Modbus thermostat or from the Micro CAN connected sensors.
Modbus Type:
- .BIT7: =0->Modbus VOC is used, =1->uCAN VOC is used
- .BIT6: =0->Modbus CO2 is used, =1->uCAN CO2 is used
- .BIT5: =0->Modbus humidity is used, =1->uCAN humidity is used
- .BIT4: =0->Modbus temp is used, =1->uCAN temp is used
- .BIT3: =0->Modbus LUX is used, =1->uCAN LUX is used
- .BIT2: =0->Modbus SOUND is used, =1->uCAN SOUND is used
- .BIT1:
- .BIT0:
We've a thermostat that uses temperature, humidity and CO2. However, we will only use temperature and humidity from the Modbus thermostat (thus thermostat type = 0d11001111 = 207)
ThermostatMode:
- .BIT7: Wait Gateway for Setpoint to be updated (1)
- .BIT6: Wait Micro CAN for Setpoint to be updated (1)
- .BIT5:
- .BIT4: Thermostat responding (1)
- .BIT3: Mode
- .BIT2: Mode
- .BIT1: Cooling (0), Heating (1)
- .BIT0: Thermostat not in use (0), in use (1)
