Modbus RTU
Condair ME
Condair
Adiabatic evaporative humidifier and cooler: status, faults, pump speeds, humidity, capacity, setpoints and remote commands over Modbus RTU or TCP.
Overview
The Condair ME is an adiabatic evaporative humidifier and cooler for air handling units, with an integrated controller that speaks Modbus RTU over RS485 or Modbus TCP. This template follows section 7.2 of the Condair Modbus addendum manual 2603326-G EN 2607 (for DL II, ME II, RS II, RO-E and Vita) and reads system mode, device status, maintenance and error status, pump faults and speeds, valves and tank levels, humidity or demand, air and water temperature, water capacity per stage and the service counters. Setpoints, the Modbus demand signal and remote draining, wash over and reset are writable. Default Modbus RTU link: address 10, 19200 baud, even parity, 8 data bits, 1 stop bit.
Key readings
- System mode and device status
- Maintenance and error status with error code
- Safety loop and running stages
- Faults and speeds of pumps 1 to 7
- Actual humidity or demand
- Air and water temperature and conductivity
- Water capacity per stage
- Operating hours and next maintenance
Available commands
- Humidity setpoint, P-band and I-time
- Temperature setpoint and P-band in cooling mode
- Humidity or demand signal via Modbus
- Remote draining
- Remote matrix wash over
- Remote error and warning reset
Use cases
- Alert on Maintenance And Error Status and Error Or Warning Code so a service technician knows which fault to fix before visiting.
- Watch Fault Pump 1 to 7 and Speed Pump 1 to 7 to spot a failing pump in the evaporative cassette.
- Plan service visits from Next Maintenance and Next UV Lamp Exchange.
- Compare Actual Humidity Or Demand with Setpoint Humidity Control to check that the AHU reaches its humidity target.
- Start Remote Draining before a long standstill and read the draining progress in the same register.
Installation
- 1Connect Data+, Data- and GND of the integrated controller to the RS485 port of your ModbusCloud Gateway. Terminate both ends of the bus.
- 2On the controller open Menu, enter password 8808, go to Network, Modbus Settings and set protocol Modbus/RTU, address, baud rate, parity and Register Sequence MSR first.
- 3In ModbusCloud, add a Modbus device (RTU) with the same address and serial settings, then import this template.
- 4Check the link: System Mode and Device Status should match the controller display, for example 9 = Standby when there is no demand.
Things to watch for
- The Condair ME does not answer on the RS485 bus. What should I check?
- Check that the protocol under Network, Modbus Settings is Modbus/RTU and not Off or Modbus/TCP, and that address, baud rate and parity match, by default 10, 19200 baud and even parity. Then swap Data+ and Data- and check the termination at both ends of the bus. Changing the settings restarts the controller.
- The temperatures and capacities show strange values.
- They are 32-bit floats. With Register Sequence LSR first the words arrive swapped; set MSR first on the controller or change the byte order to CDAB. Remember that the unit follows the Metric or Imperial setting.
- Writing the demand signal has no effect or warning W35 appears.
- The Modbus signal register 43004 is only used when Source is set to Modbus under Controls, Signal Settings. The master must write it again within the Signal Timeout (default 300 s), otherwise warning W35 Signal Timeout stops humidification.
- How do I start draining or reset an error remotely?
- Write 1 to Remote Draining to start draining and 0 to stop; reading the register gives 100 when off or the progress in percent. Write 1 to Remote Error Warning Reset to reset errors and warnings.
Registers (60)
60 read / 11 write
| Name | Address | Function | Type | Unit | Access |
|---|---|---|---|---|---|
| System Mode | ••• | ••• | ••• | R | |
| Device Status | ••• | ••• | ••• | R | |
| Maintenance And Error Status | ••• | ••• | ••• | R | |
| Error Or Warning Code | ••• | ••• | ••• | R | |
| Safety Loop | ••• | ••• | ••• | R | |
| Number Of Running Stages | ••• | ••• | ••• | R | |
| Fault Pump 1 | ••• | ••• | ••• | R | |
| Fault Pump 2 | ••• | ••• | ••• | R | |
| Fault Pump 3 | ••• | ••• | ••• | R | |
| Fault Pump 4 | ••• | ••• | ••• | R | |
| Fault Pump 5 | ••• | ••• | ••• | R | |
| Fault Pump 6 | ••• | ••• | ••• | R | |
| Fault Pump 7 | ••• | ••• | ••• | R | |
| Fault Water Inlet | ••• | ••• | ••• | R | |
| Fault Water Temperature | ••• | ••• | ••• | R | |
| Fault Water Outlet | ••• | ••• | ••• | R | |
| Fault Level Sensor | ••• | ••• | ••• | R | |
| Fault Water Conductivity | ••• | ••• | ••• | R | |
| Speed Pump 1 | ••• | ••• | ••• | % | R |
| Speed Pump 2 | ••• | ••• | ••• | % | R |
| Speed Pump 3 | ••• | ••• | ••• | % | R |
| Speed Pump 4 | ••• | ••• | ••• | % | R |
| Speed Pump 5 | ••• | ••• | ••• | % | R |
| Speed Pump 6 | ••• | ••• | ••• | % | R |
| Speed Pump 7 | ••• | ••• | ••• | % | R |
| Water Level Tank | ••• | ••• | ••• | R | |
| WET Tank Level | ••• | ••• | ••• | R | |
| Disinfection Tank Level | ••• | ••• | ••• | R | |
| Leakage Sensor | ••• | ••• | ••• | R | |
| Inlet Valve | ••• | ••• | ••• | R | |
| Drain Valve | ••• | ••• | ••• | R | |
| Drain Pump | ••• | ••• | ••• | R | |
| Actual Humidity Or Demand | ••• | ••• | ••• | % | R |
| Actual Air Temperature | ••• | ••• | ••• | R | |
| Incoming Air Temperature | ••• | ••• | ••• | R | |
| Actual Water Temperature | ••• | ••• | ••• | R | |
| Water Conductivity | ••• | ••• | ••• | µS/cm | R |
| UV Current | ••• | ••• | ••• | A | R |
| Water Capacity Stage 1 | ••• | ••• | ••• | R | |
| Water Capacity Stage 2 | ••• | ••• | ••• | R | |
| Water Capacity Stage 3 | ••• | ••• | ••• | R | |
| Water Capacity Stage 4 | ••• | ••• | ••• | R | |
| Water Capacity Stage 5 | ••• | ••• | ••• | R | |
| Water Capacity Stage 6 | ••• | ••• | ••• | R | |
| Water Capacity Stage 7 | ••• | ••• | ••• | R | |
| Operating Hours | ••• | ••• | ••• | h | R |
| Next Maintenance | ••• | ••• | ••• | h | R |
| Next UV Lamp Exchange | ••• | ••• | ••• | d | R |
| Next PureFlo Exchange | ••• | ••• | ••• | d | R |
| Setpoint Humidity Control | ••• | ••• | ••• | % | R/W |
| P-Band Humidity Control | ••• | ••• | ••• | % | R/W |
| I-Time Humidity Control | ••• | ••• | ••• | min | R/W |
| Actual Humidity Or Demand Via Modbus | ••• | ••• | ••• | % | R/W |
| I-Time Temperature Control | ••• | ••• | ••• | min | R/W |
| Setpoint Temperature Control | ••• | ••• | ••• | R/W | |
| P-Band Temperature Control | ••• | ••• | ••• | R/W | |
| Actual Temperature Via Modbus | ••• | ••• | ••• | R/W | |
| Remote Draining | ••• | ••• | ••• | R/W | |
| Remote Matrix Wash Over | ••• | ••• | ••• | R/W | |
| Remote Error Warning Reset | ••• | ••• | ••• | R/W |
Loading registers…
Read the Condair ME remotely
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Data in the Netherlands and Germany
Open standard
Based on Modbus RTU/TCP
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European company
Based in the Netherlands
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