4.7 KiB
4.7 KiB
Tübingen Instruments RIU-9000 Datasheet
Manufacturer: TI (Tübingen Instruments)
Overview
The RIU-9000 is a versatile Remote Interface Unit (RIU) designed for spacecraft sensor management. This device interfaces with an Adafruit BMP280 sensor to provide accurate pressure and temperature readings. The RIU-9000 allows users to configure sensor parameters and retrieve sensor data through a structured 4-step communication protocol.
Features
- Sensor Support: Integrated support for BMP280 pressure and temperature sensor.
- Configurable Parameters: Offset and sampling rate adjustments for both pressure and temperature readings.
- Reliable Communication: 4-step communication protocol to ensure data integrity.
- Error Handling: Error messages for invalid commands or parameters.
- Industry Standard Data Format: Sensor data is sent in binary format representing 32 bit IEEE-754 Floating Point values.
Commands and Responses
General Format
Commands should be sent as strings over the serial interface at 115200 baud rate. Commands are case-sensitive and must be followed by a newline character (\n
). Parameters and values should be separated by a space. Responses from the RIU-9000 will also be in string format.
STARTUP
- Command:
STARTUP
- Response:
READY - Tübingen Instruments RIU-9000
- Description: Initializes the device. This command must be sent before any other commands are accepted.
GET_SENSOR
- Command:
GET_SENSOR [COMMAND] [SENSOR]
- Description: Initiates a 4-step communication process to read sensor data.
- Steps:
- REQUEST: Command the device to read sensor value.
- Command:
GET_SENSOR REQUEST [SENSOR]
- Response:
OK
orERROR
- Command:
- CONFIRM: Ask if the device requested the data from the sensor.
- Command:
GET_SENSOR CONFIRM [SENSOR]
- Response:
TRUE
orFALSE
- Command:
- CHECK: Ask if the data is present now.
- Command:
GET_SENSOR CHECK [SENSOR]
- Response:
TRUE
orFALSE
- Command:
- SEND: Command the device to send the data to the user.
- Command:
GET_SENSOR SEND [SENSOR]
- Response:
[DATA]
orFALSE
- Command:
- CANCEL: Cancel the sensor reading request.
- Command:
GET_SENSOR CANCEL [SENSOR]
- Response:
OK
- Command:
- REQUEST: Command the device to read sensor value.
SET_PARAMETER
- Command:
SET_PARAMETER [PARAM] [VALUE]
- Response:
OK
orERROR: UNKNOWN PARAMETER
- Parameters:
PRESSURE_OFFSET
: Sets the offset for pressure readings. (In hPa)TEMPERATURE_OFFSET
: Sets the offset for temperature readings. (In °C)PRESSURE_SAMPLING
: Sets the oversampling rate for the pressure sensor (SAMPLING_NONE
,SAMPLING_X1
,SAMPLING_X2
,SAMPLING_X4
,SAMPLING_X8
,SAMPLING_X16
).TEMPERATURE_SAMPLING
: Sets the oversampling rate for the temperature sensor (SAMPLING_NONE
,SAMPLING_X1
,SAMPLING_X2
,SAMPLING_X4
,SAMPLING_X8
,SAMPLING_X16
).
GET_PARAMETER
- Command:
GET_PARAMETER [PARAM]
- Response:
[VALUE]
orERROR: UNKNOWN PARAMETER
- Parameters:
PRESSURE_OFFSET
: Retrieves the current pressure offset.TEMPERATURE_OFFSET
: Retrieves the current temperature offset.PRESSURE_SAMPLING
: Retrieves the current pressure oversampling rate.TEMPERATURE_SAMPLING
: Retrieves the current temperature oversampling rate.
RESET_SENSORS
- Command:
RESET_SENSORS
- Response:
OK
- Description: Resets the request count and communication state.
Communication Errors
- BUSY: Device is busy. Every 20th request, the device will respond with
BUSY
and not process the command. - ERROR: Generic error message for invalid commands or failed operations.
- FALSE: Response for confirmation checks that fail.
- [NO RESPONSE]: After 100 requests, the device will stop responding to commands until a
RESET_SENSORS
command is issued.
Example Usage
Initialization
User: STARTUP
Device: READY
Setting Parameters
User: SET_PARAMETER PRESSURE_OFFSET 10
Device: OK
User: SET_PARAMETER PRESSURE_SAMPLING SAMPLING_X4
Device: OK
Getting Parameters
User: GET_PARAMETER PRESSURE_OFFSET
Device: 10
User: GET_PARAMETER PRESSURE_SAMPLING
Device: SAMPLING_X4
Reading Sensor Data
User: GET_SENSOR REQUEST PRESSURE
Device: OK
User: GET_SENSOR CONFIRM PRESSURE
Device: OK
User: GET_SENSOR CHECK PRESSURE
Device: FALSE
User: GET_SENSOR CHECK PRESSURE
Device: TRUE
User: GET_SENSOR SEND PRESSURE
Device: [Binary Data]
Resetting Sensors
User: RESET_SENSORS
Device: OK
For more detailed information and troubleshooting, please refer to the official TI (Tübingen Instruments) RIU-9000 documentation.