Bes-Tech DigiRTU
Manufacturer: Bes-Tech
Product: Digi-RTU
Model:
Class: MODBUS
Updated: 2023-11-13
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Registers
| # | Name | Unit | Description |
|---|---|---|---|
| 1 | Indoor fan call from T-stat or BAS | . | |
| 2 | Cooling call from T-stat or BAS | . | |
| 3 | Heating call from T-stat or BAS | . | |
| 4 | Outside air temperature (Digi-RTU sensor) | °F | |
| 5 | Outside air relative humidity (Digi-RTU sensor) | % | |
| 6 | Supply air temperature (Digi-RTU sensor) | °F | |
| 7 | Return air CO2 concentration Digi-RTU sensor) | ppm | |
| 8 | Return air or room air temperature (Digi-RTU sensor) | °F | |
| 9 | Return air relative humidity (Digi-RTU sensor) | % | |
| 10 | Fan command to fan contactor or VFD | . | |
| 11 | Power exhaust fan command | . | |
| 12 | On/off command to the first compressor in the first circuit | . | |
| 13 | On/off command to the first compressor in the second circuit | . | |
| 14 | On/off command to the second compressor in the first circuit | . | |
| 15 | On/off command to the second compressor in the second circuit | . | |
| 16 | On/off command to the first stage heater | . | |
| 17 | On/off command to the second stage heater | . | |
| 18 | Outside air damper command | % | |
| 19 | Supply fan speed command | Hz | |
| 20 | Supply fan speed feedback | Hz | |
| 21 | Supply fan power | kW | |
| 22 | Compressor speed command | Hz | |
| 23 | Compressor speed feedback for the first compressor in the first circuit | Hz | |
| 24 | Compressor power for the first compressor in the first circuit | kW | |
| 25 | Compressor speed feedback for the first compressor in the second circuit | Hz | |
| 26 | Compressor power for the first compressor in the second circuit | kW | |
| 27 | Overrride to the indoor fan on/off | . | |
| 28 | Override to the first stage heater on/off | . | |
| 29 | Override to the second stage heater on/off | . | |
| 30 | Overrride to the first compressor in the first circuit on/off | . | |
| 31 | Overrride to the first compressor in the second circuit on/off | . | |
| 32 | Overrride to the second compressor in the first circuit on/off | . | |
| 33 | Overrride to the second compressor in the second circuit on/off | . | |
| 34 | Overrride to the supply fan speed | . | |
| 35 | Override to the compressor speed | . | |
| 36 | Override to the outside air damper position | . | |
| 37 | Digi-RTU ID for Modbus communication with BAS | . | |
| 38 | Activate the new setting/address | . | |
| 39 | System type (RTU or HP) | . | |
| 40 | System configuration: 1/1; 1/2; 2/2; 2/3; and 2/4 | . | |
| 41 | Stacked or entwined | . | |
| 42 | Economizer enbaled or disabled | . | |
| 43 | Heat pump reversing valve type | . | |
| 44 | Number of compressor VFDs | . | |
| 45 | VFD brand for supply fan | . | |
| 46 | Maximum output to supply fan VFD | mV | |
| 47 | VFD speed corresponding to the maximum input to the VFD | Hz | |
| 48 | Minimum output to supply fan VFD | mV | |
| 49 | VFD speed corresponding to the minimum input to the VFD | Hz | |
| 50 | Fan only speed setpoint | Hz | |
| 51 | VFD brand for the first compressor VFD | . | |
| 52 | VFD brand for the second compressor VFD | . | |
| 53 | Compressor VFD maximum output | mV | |
| 54 | Compressor VFD speed corresponding to the maximum output | Hz | |
| 55 | Compressor VFD minimum output | mV | |
| 56 | Compressor VFD speed corresponding to the minimum output | Hz | |
| 57 | Compressor VFD minimum speed limit | Hz | |
| 58 | Supply air temperature setpoint for cooling | °F | |
| 59 | Supply air temperature setpoint for economizer operation | °F | |
| 60 | Supply air temperature setpoint for heating | °F | |
| 61 | Return air temperature low limit for cooling | °F | |
| 62 | Lock out outside air temperature for compressors | °F | |
| 63 | Economizer high outside air temperature limit | °F | |
| 64 | Economizer low outside air temperature limit | °F | |
| 65 | Enthalpy economizer outside air enthalpy cutoff value | . | |
| 66 | Minimum output to the outside air damper | mV | |
| 67 | Maximum output to the outside air damper | mV | |
| 68 | Minimum outside air damper position | % | |
| 69 | Return air temeprature sensor type | . | |
| 70 | Supply air temperature sensor type | . | |
| 71 | Outside air temeprature sensor type | . | |
| 72 | Communication faults | . | |
| 73 | Economizer fault | . | |
| 74 | Heating fault | . | |
| 75 | Supply fan fault | . | |
| 76 | Compressor fault | . | |
| 77 | Condensor fault | . | |
| 78 | Evaporator fault | . | |
| 79 | Low charge fault | . | |
| 80 | Temperature sensor fault | . | |
| 81 | CO2 sensor fault | . |
Notes
The Digi-RTU is a Heating, Ventilation, and Air Conditioning (HVAC) rooftop unit control kit that is both a demand management and energy usage device. It is designed to improve the energy efficiency and demand requirements of a rooftop unit as well as solve the humidity, common noise, and frequent on/off issues of a rooftop unit through modulating the capacity of a rooftop unit to match the cooling or heating space requirements. Connect R25/+/Red -> ezeio D1 R25/-/Black -> ezeio D0 R25/0/White -> ezeio 0V/gnd