Modbus RTU
Condair RS II
Condair
Resistive steam humidifier: status, error code, safety chain, steam output, demand and maintenance hours over Modbus RTU.
Overview
The Condair RS II is a resistive steam humidifier for air handling units and rooms in offices, hospitals, labs and production, with one or two steam cylinders. Its Integrated Controller speaks Modbus RTU. This template follows the Condair Modbus addendum 2603326-G and reads 35 registers: status of each cylinder, maintenance and error status with the error code, the safety chain, steam output, demand, operating hours and the hours to the next maintenance. Default link: address 10, 19200 baud, 8 data bits, even parity, 1 stop bit.
Key readings
- Device status per cylinder
- Maintenance and error status, error code
- Safety chain: overheat switches, safety loops, floaters
- Actual steam capacity per unit and per cylinder
- System demand and control signals
- Operating hours and hours to the next maintenance
- Water level per cylinder
Use cases
- Get an alert when Maintenance and Error Status reaches Error and read Error Warning Code before the service visit.
- Watch Next Small Maintenance Cylinder A and plan cylinder cleaning before the maintenance is due.
- Compare Actual Humidification Capacity with System Demand to see whether the unit keeps up in dry winter weeks.
- Alert on Overheat Switch or External Safety Loop going to Open, so a tripped safety chain is noticed right away.
- Log Operating Hours per cylinder to plan replacement parts and compare units across sites.
Installation
- 1Connect Data+, Data- and GND of the Modbus terminal on the Integrated Controller to the RS485 port of your ModbusCloud Gateway with shielded twisted pair and terminate the line at both ends.
- 2On the touch screen open Menu, password 8808, Network, Modbus Settings and check Modbus/RTU, address 10, parity even, baud rate 19200 and register sequence MSR first. Changes take effect after a restart.
- 3In ModbusCloud, add a Modbus device (RTU) with address 10, 19200 baud, 8 data bits, even parity and 1 stop bit, then import this template.
- 4Check the link: Device Status Cylinder A should show a status such as Standby or Humidifying, and Operating Hours should match the value on the display.
Things to watch for
- The humidifier does not answer. What should I check?
- Factory settings are address 10, 19200 baud and even parity, and the frame always has one parity bit and one stop bit. Many masters default to no parity. Settings in Modbus Settings only work after a restart. The interface is not galvanically isolated, so connect GND between the Gateway and the controller.
- Capacity and hours show huge or tiny numbers.
- These values are 32-bit floats in two registers. The template expects the factory register sequence MSR first. If someone set the controller to LSR first, change the byte order of the float registers to CDAB in the portal, or set the controller back to MSR first.
- Humidification stops with warning W35 Signal Timeout.
- W35 appears when the signal source is set to Modbus and no new demand or humidity value arrives in the Modbus demand register (43008 on the RS) within the signal timeout (default 300 s). This template does not send that signal. Either let the BMS write the value, or set the signal source back to Analog.
- Why are the capacity values in lb/hr?
- The capacity registers follow the Metric or Imperial setting of the RS controller: kg/h in metric, lb/hr in imperial. The template keeps the unit empty for that reason. Switch the unit setting on the controller if you want kg/h.
Registers (35)
35 read / 0 write
| Name | Address | Function | Type | Unit | Access |
|---|---|---|---|---|---|
Device Status Cylinder A Operating status of steam cylinder A. Condair register 32001 (address 2000). | ••• | ••• | ••• | R | |
Device Status Cylinder B Operating status of steam cylinder B (units with two cylinders). Condair register 32002 (address 2001). | ••• | ••• | ••• | R | |
Maintenance and Error Status Highest pending maintenance or error state of the humidifier. Condair register 32003 (address 2002). | ••• | ••• | ••• | R | |
Error Warning Code Code of the active error or warning, 0 = no error. Look the code up in the malfunction list of the Condair RS operation manual. Condair register 32004 (address 2003). | ••• | ••• | ••• | R | |
Overheat Switch Cylinder A Overheat switch of cylinder A: 1 = closed (ok), 0 = open (tripped). Condair register 32005. | ••• | ••• | ••• | R | |
Overheat Switch Cylinder B Overheat switch of cylinder B: 1 = closed (ok), 0 = open (tripped). Condair register 32006. | ••• | ••• | ••• | R | |
External Safety Loop Cylinder A External safety loop of cylinder A: 1 = closed (ok), 0 = open. Condair register 32007. | ••• | ••• | ••• | R | |
External Safety Loop Cylinder B External safety loop of cylinder B: 1 = closed (ok), 0 = open. Condair register 32008. | ••• | ••• | ••• | R | |
Security Floater Cylinder A Security floater of cylinder A: 1 = closed (ok), 0 = open. Condair register 32009. | ••• | ••• | ••• | R | |
Security Floater Cylinder B Security floater of cylinder B: 1 = closed (ok), 0 = open. Condair register 32010. | ••• | ••• | ••• | R | |
Heating Voltage Cylinder A Heating voltage on cylinder A: 1 = on, 0 = off. Condair register 32011. | ••• | ••• | ••• | R | |
Heating Voltage Cylinder B Heating voltage on cylinder B: 1 = on, 0 = off. Condair register 32012. | ••• | ••• | ••• | R | |
Main Contactor Cylinder A Main contactor of cylinder A: 1 = on, 0 = off. Condair register 32015. | ••• | ••• | ••• | R | |
Main Contactor Cylinder B Main contactor of cylinder B: 1 = on, 0 = off. Condair register 32016. | ••• | ••• | ••• | R | |
Leakage Sensor Optional leakage sensor: 1 = on (no leak), 0 = off (leak). Condair register 32027. | ••• | ••• | ••• | R | |
Level Cylinder A Water level in cylinder A, in steps from no level to high. Condair register 32029. | ••• | ••• | ••• | R | |
Level Cylinder B Water level in cylinder B, in steps from no level to high. Condair register 32030. | ••• | ••• | ••• | R | |
Nominal Voltage Configured nominal heating voltage as a code. Condair register 32031. | ••• | ••• | ••• | R | |
Actual Humidification Capacity Current steam output of the unit, 0 to 160 kg/h (metric setting) or 0 to 360 lb/hr (imperial setting). 32-bit float. Condair register 32048 (address 2047). | ••• | ••• | ••• | R | |
Actual Capacity Cylinder A Current steam output of cylinder A, 0 to 40 kg/h or 0 to 90 lb/hr depending on the unit setting. 32-bit float. Condair register 32050. | ••• | ••• | ••• | R | |
Actual Capacity Cylinder B Current steam output of cylinder B, 0 to 40 kg/h or 0 to 90 lb/hr depending on the unit setting. 32-bit float. Condair register 32052. | ••• | ••• | ••• | R | |
Max Humidification Capacity Maximum steam capacity of the unit, 5 to 160 kg/h or 10 to 360 lb/hr depending on the unit setting. 32-bit float. Condair register 32042. | ••• | ••• | ••• | R | |
Control Signal CH1 Control signal on channel 1, 0 to 100 %. 32-bit float. Condair register 32054. | ••• | ••• | ••• | % | R |
Control Signal CH2 Control signal on channel 2, 0 to 100 %. 32-bit float. Condair register 32056. | ••• | ••• | ••• | % | R |
System Demand Steam demand of the system, 0 to 100 %. 32-bit float. Condair register 32058. | ••• | ••• | ••• | % | R |
Operating Hours Operating hours of the unit, 0 to 1200000 h. 32-bit float. Condair register 32060. | ••• | ••• | ••• | h | R |
Operating Hours Cylinder A Operating hours of cylinder A, 0 to 1200000 h. 32-bit float. Condair register 32062. | ••• | ••• | ••• | h | R |
Operating Hours Cylinder B Operating hours of cylinder B, 0 to 1200000 h. 32-bit float. Condair register 32064. | ••• | ••• | ••• | h | R |
Next Small Maintenance Cylinder A Hours until the next small maintenance of cylinder A, 0 to 6000 h. 32-bit float. Condair register 32066. | ••• | ••• | ••• | h | R |
Next Small Maintenance Cylinder B Hours until the next small maintenance of cylinder B, 0 to 6000 h. 32-bit float. Condair register 32068. | ••• | ••• | ••• | h | R |
Next Extended Maintenance Cylinder A Hours until the next extended maintenance of cylinder A, 0 to 6000 h. 32-bit float. Condair register 32070. | ••• | ••• | ••• | h | R |
Next Extended Maintenance Cylinder B Hours until the next extended maintenance of cylinder B, 0 to 6000 h. 32-bit float. Condair register 32072. | ••• | ••• | ••• | h | R |
Setpoint CH1 Humidity setpoint channel 1, 5 to 95 %. Writable in the Condair table, read-only in this template. Condair holding register 43001 (address 3000). | ••• | ••• | ••• | % | R |
Setpoint CH2 Humidity setpoint channel 2, 5 to 95 %. Read-only in this template. Condair holding register 43002. | ••• | ••• | ••• | % | R |
Capacity Limitation Capacity limitation, 20 to 100 % of the maximum capacity. Read-only in this template. Condair holding register 43007. | ••• | ••• | ••• | % | R |
Loading registers…
Read the Condair RS II remotely
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EU-hosted
Data in the Netherlands and Germany
Open standard
Based on Modbus RTU/TCP
Free to browse
No account or payment required
European company
Based in the Netherlands
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