diff --git a/rtu/device/base_config.hpp b/rtu/device/base_config.hpp
new file mode 100644
index 0000000..595c0df
--- /dev/null
+++ b/rtu/device/base_config.hpp
@@ -0,0 +1,102 @@
+#pragma once
+
+#include "modbus/modbus.hpp"
+
+#include <xyz/openbmc_project/Sensor/Value/client.hpp>
+
+namespace phosphor::modbus::rtu::device
+{
+
+namespace ModbusIntf = phosphor::modbus::rtu;
+
+namespace config
+{
+
+using SensorValueIntf =
+    sdbusplus::client::xyz::openbmc_project::sensor::Value<>;
+
+enum class SensorFormat
+{
+    floatingPoint,
+    integer,
+    unknown
+};
+
+struct SensorRegister
+{
+    std::string name = "unknown";
+    std::string pathSuffix = "unknown";
+    SensorValueIntf::Unit unit;
+    uint16_t offset = 0;
+    uint8_t size = 0;
+    uint8_t precision = 0;
+    double scale = 1.0;
+    double shift = 0.0;
+    bool isSigned = false;
+    SensorFormat format = SensorFormat::unknown;
+};
+
+enum class StatusType
+{
+    controllerFailure,
+    fanFailure,
+    filterFailure,
+    powerFault,
+    pumpFailure,
+    leakDetectedCritical,
+    leakDetectedWarning,
+    sensorFailure,
+    sensorReadingCritical,
+    sensorReadingWarning,
+    unknown
+};
+
+struct StatusBit
+{
+    std::string name = "unknown";
+    StatusType type = StatusType::unknown;
+    uint8_t bitPosition = 0;
+    bool value = false;
+};
+
+enum class FirmwareRegisterType
+{
+    version,
+    update,
+    unknown
+};
+
+struct FirmwareRegister
+{
+    std::string name = "unknown";
+    FirmwareRegisterType type = FirmwareRegisterType::unknown;
+    uint16_t offset = 0;
+    uint8_t size = 0;
+};
+
+struct Config
+{
+    using sensor_registers_t = std::vector<SensorRegister>;
+    using status_registers_t =
+        std::unordered_map<uint16_t, std::vector<StatusBit>>;
+    using firmware_registers_t = std::vector<FirmwareRegister>;
+
+    uint8_t address = 0;
+    ModbusIntf::Parity parity = ModbusIntf::Parity::unknown;
+    uint32_t baudRate = 0;
+    std::string name = "unknown";
+    std::string portName = "unknown";
+    sdbusplus::message::object_path inventoryPath;
+    sensor_registers_t sensorRegisters;
+    status_registers_t statusRegisters;
+    firmware_registers_t firmwareRegisters;
+};
+
+auto updateBaseConfig(sdbusplus::async::context& ctx,
+                      const sdbusplus::message::object_path& objectPath,
+                      const std::string& interfaceName, Config& config)
+    -> sdbusplus::async::task<bool>;
+
+} // namespace config
+
+} // namespace phosphor::modbus::rtu::device