Salda RIS 700 VE EKO 3.0 RVP 485P
Controls and monitors a Salda air handling unit via Modbus RTU
This template connects to the Salda RIS 700 VE EKO 3.0 air handling unit via Modbus RTU using the RVP 485P interface module. It reads temperatures, fan status, filter status, humidity, and preheater status, and allows control of fan speed and temperature setpoint.
- Protocol
- Modbus RTU
- Connection
- RS485, 19200 baud
- Registers
- 8, read and write
- Brand
- SALDA
- Key readings
- Exhaust temperature · Limit temperature · Filter status · Fan status · Relative humidity · Preheater status
- Available commands
- Fan speed · Temperature setpoint
- Compatible models
- RIS 700 VE EKO 3.0 · RVP 485P
- Last updated
Registers (8)
6 read, 2 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Filter | Read | ||||
| Fan | Read | ||||
| RH_value | % | Read | |||
| Texhaust | °C | Read | |||
| Preheater | Read | ||||
| Tlimit | °C | Read | |||
| Speed | Write | ||||
| TsetPoint | °C | Write |
Loading registers…
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Use cases
- Monitor exhaust temperature and relative humidity on a live cloud dashboard for each ventilation zone.
- Adjust the temperature setpoint remotely when seasonal conditions change, avoiding an on-site visit.
- Create an alert when the filter status indicates contamination so maintenance can be scheduled proactively.
- Log fan status and preheater activity over time to verify energy recovery performance for the building owner.
- Set fan speed to a lower level during unoccupied hours to reduce energy consumption automatically.
Installation
Connect the ModbusCloud Gateway to the RVP 485P module via a shielded twisted pair RS-485 cable, wiring A to A and B to B terminals.
Set the Modbus slave address on the RVP 485P controller to match the address configured in the ModbusCloud template, typically address 1 if only one unit is on the bus.
Confirm the communication settings on the RVP 485P are set to 19200 baud, odd parity, and 8 data bits, matching the template defaults.
Import the Salda RIS 700 VE EKO 3.0 template from the ModbusCloud library into your gateway configuration.
Power on the air handling unit, verify that register values such as exhaust temperature and fan status appear correctly on the ModbusCloud dashboard.
Terminate the RS-485 bus with a 120 ohm resistor at the last device if the cable run exceeds 10 meters or if communication errors occur.
Things to watch for
Why do read and write registers both start at address 0?
The Salda RVP 485P uses separate Modbus function code ranges for reading and writing. Input registers (function code 4) and holding registers (function code 3 or 6/16) occupy independent address spaces. The template already accounts for this, so no manual adjustment is required.
What baud rate and parity settings should I use?
The RVP 485P requires 19200 baud with odd parity (8 data bits, 1 stop bit). If these settings do not match on the gateway side, the device will not respond to Modbus requests.
The gateway cannot communicate with the unit. What should I check?
Verify RS-485 wiring polarity (A to A, B to B). Confirm the slave address on the RVP 485P matches the template configuration. Ensure baud rate and parity are set to 19200 and odd on both sides. Add a 120 ohm termination resistor if the cable length is long.
Can I control multiple Salda AHUs on the same RS-485 bus?
Yes. Assign a unique Modbus slave address to each RVP 485P module and duplicate the template in ModbusCloud with the matching address for each unit. Keep total bus length within RS-485 limits and terminate both ends of the bus.
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