verified connector library

Trane Ascend/Symbio chiller controller

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

pointaddress (0-based)typescaleunit
active_chilled_water_setpoint10F32BE1
evaporator_entering_water_temperature12F32BE1
evaporator_leaving_water_temperature14F32BE1
calculated_chiller_capacity16F32BE1
active_demand_limit_setpoint18F32BE1
unit_power_consumption20F32BE1
outdoor_air_temperature24F32BE1
evaporator_refrigerant_pressure_circuit_126F32BE1
condenser_refrigerant_pressure_circuit_128F32BE1
differential_refrigerant_pressure_circuit_130F32BE1
evaporator_saturated_refrigerant_temperature_circuit_132F32BE1
condenser_saturated_refrigerant_temperature_circuit_134F32BE1
evaporator_refrigerant_pressure_circuit_236F32BE1
condenser_refrigerant_pressure_circuit_238F32BE1
differential_refrigerant_pressure_circuit_240F32BE1
evaporator_saturated_refrigerant_temperature_circuit_242F32BE1
condenser_saturated_refrigerant_temperature_circuit_244F32BE1
refrigerant_discharge_temperature_compressor_1a46F32BE1
oil_pressure_compressor_1a48F32BE1
refrigerant_discharge_temperature_compressor_2a50F32BE1
oil_pressure_compressor_2a52F32BE1
air_flow_percentage_circuit_154F32BE1
air_flow_percentage_circuit_256F32BE1
starts_compressor_1a58F32BE1
run_time_compressor_1a60F32BE1
compressor_1a_speed_status62F32BE1
motor_winding_temperature_1_circuit_164F32BE1
motor_winding_temperature_2_circuit_166F32BE1
drive_motor_current_u_rla_compressor_1a68F32BE1
drive_motor_current_v_rla_compressor_1a70F32BE1
drive_motor_current_w_rla_compressor_1a72F32BE1
drive_motor_average_current_rla_compressor_1a74F32BE1
drive_motor_current_u_compressor_1a76F32BE1
drive_motor_current_v_compressor_1a78F32BE1
drive_motor_current_w_compressor_1a80F32BE1
drive_motor_voltage_uv_circuit_182F32BE1
drive_motor_voltage_vw_circuit_184F32BE1
drive_motor_voltage_wu_circuit_186F32BE1
drive_motor_average_voltage_circuit_188F32BE1
drive_dc_bus_voltage_circuit_190F32BE1
drive_output_power_circuit_192F32BE1
drive_input_power_circuit_194F32BE1
drive_line_average_voltage_circuit_196F32BE1
drive_average_line_current_circuit_198F32BE1
drive_line_frequency_circuit_1100F32BE1
afd_frequency_circuit_1102F32BE1
afd_transistor_temperature_circuit_1104F32BE1
drive_inverter_base_temperature_circuit_1106F32BE1
drive_rectifier_base_temperature_circuit_1108F32BE1
starts_compressor_2a110F32BE1
run_time_compressor_2a112F32BE1
compressor_2a_speed_status114F32BE1
motor_winding_temperature_1_circuit_2116F32BE1
motor_winding_temperature_2_circuit_2118F32BE1
drive_motor_current_u_rla_compressor_2a120F32BE1
drive_motor_current_v_rla_compressor_2a122F32BE1
drive_motor_current_w_rla_compressor_2a124F32BE1
drive_motor_average_current_rla_compressor_2a126F32BE1
drive_motor_current_u_compressor_2a128F32BE1
drive_motor_current_v_compressor_2a130F32BE1
drive_motor_current_w_compressor_2a132F32BE1
drive_motor_voltage_uv_circuit_2134F32BE1
drive_motor_voltage_vw_circuit_2136F32BE1
drive_motor_voltage_wu_circuit_2138F32BE1
drive_motor_average_voltage_circuit_2140F32BE1
drive_dc_bus_voltage_circuit_2142F32BE1
drive_output_power_circuit_2144F32BE1
drive_input_power_circuit_2146F32BE1
drive_line_average_voltage_circuit_2148F32BE1
drive_average_line_current_circuit_2150F32BE1
drive_line_frequency_circuit_2152F32BE1
afd_frequency_circuit_2154F32BE1
afd_transistor_temperature_circuit_2156F32BE1
drive_inverter_base_temperature_circuit_2158F32BE1
drive_rectifier_base_temperature_circuit_2160F32BE1
free_cooling_capacity168F32BE1
free_cooling_entering_water_temperature170F32BE1
energy_consumption_lifetime172F32BE1
energy_consumption174F32BE1
chiller_design_capacity178F32BE1
active_cool_heat_setpoint_temperature180F32BE1
actual_running_capacity182F32BE1
bas_chilled_water_setpoint9F32BE1
bas_demand_limit_setpoint11F32BE1
run_enable3009I161
chiller_running_state3012I161
running_mode2009U161
operating_mode2010U161

link settings as documented (unverified): RTU/TCP; default 19200 8E1; The valid range of Modbus RTU server addresses is 001–247. Rotary address 000 disables Modbus RTU communications.

bench facts as documented (unverified)
terminalsP1 Link (+ and - terminals)
A/B polarityObserve wire polarity when connecting to the + and - terminals. The + terminals and the - terminals are internally connected.
connectorRJ-45 for Modbus TCP on Ethernet port 1
wiring notesP1 Link is used for RS-485 daisy chain.
protocol notesThe Symbio 800 controller does not support the optional Wi-Fi module with Modbus TCP communications.
powerPower for the controller is provided and connected from within the chiller control panel.
doc revisionBAS-SVP045B-EN

generated by gemini:gemini-3.5-flash · harvested from https://www.trane.com/content/dam/Trane/Commercial/global/controls/controls-literature/symbio/integration-guide/BAS-SVP045B-EN_04012021.pdf (Trane); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

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