Modbus Registers of Bus Probes

This topic lists Modbus registers found on Tibbo Bus Probes.

Common registers

These registers are present on all Bus Probes.

Addr.	Name	R/W	Type	Description
200	ID (non-volatile)	R/Wp	Unsigned 16-bit	Device ID (Modbus address). This ID must be between 1 to 247. Attempts to set an ID outside of this range will be ignored. Default ID of a Probe depends on the Probe's type: 0x40 for BP#01 (ambient temperature sensor); 0x41 for BP#02 (relative humidity and temperature sensor); 0x42 for BP#03 (ambient light sensor); 0x43 for BP#04 (3-axis accelerometer).
201	TYPE	R	Unsigned 16-bit	Probe type: 1 — BP#01 (ambient temperature sensor); 2 — BP#02 (ambient temperature and humidity sensor); 3 — BP#03 (ambient light sensor); 4 — BP#04 (3-axis acceleration sensor).
203	SIGNATURE	R	Unsigned 16-bit	Always returns 0xAA55. This is a common signature for all Bus Probes.
207	USER WORD 1 (non-volatile)	R/W	Unsigned 16-bit	Users are free to save any application-specific data in this register.
208	USER WORD 2 (non-volatile)	R/W	Unsigned 16-bit	Users are free to save any application-specific data in this register.
209	USER WORD 3 (non-volatile)	R/W	Unsigned 16-bit	Users are free to save any application-specific data in this register.
210	USER WORD 4 (non-volatile)	R/W	Unsigned 16-bit	Users are free to save any application-specific data in this register.
211	MONITOR VERSION	R	Unsigned 16-bit	Firmware version of the Monitor/Loader.
212	FIRMWARE VERSION	R	Unsigned 16-bit	Firmware version of the application firmware.

R = read, W = write, W p= protected write (possible only while the MD button* is being pressed).

* Each Bus Probe comes with a metal pin that makes pushing and holding down the MD button easier.

Addr.	Name	R/W	Type	Description
300	TEMP_PROC	R	Signed 16-bit	Processed fixed-point temperature data expressed in steps of 0.01 degrees C. Measurement resolution is 0.25 degrees C.
301	TEMP_RAW	R	Unsigned 16-bit	Raw temperature data from the measurement IC (MCP9808). See vendor datasheet for details.

R = read (only)

Addr.	Name	R/W	Type	Description
400	TEMP_PROC	R	Signed 16-bit	Processed fixed-point temperature data expressed in steps of 0.1 degrees C. Measurement resolution is 0.5 degrees C.
401	TEMP_RAW	R	Unsigned 16-bit	Raw temperature data from the measurement IC (HIH6130). See vendor datasheet for details.
404	HUM_PROC	R	Unsigned 16-bit	Processed fixed-point relative humidity data expressed in steps of 0.1%. Measurement resolution is 0.1%.
405	HUM_RAW	R	Unsigned 16-bit	Raw humidity data from the measurement IC (HIH6130). See vendor datasheet for details.

R = read (only)

Addr.	Name	R/W	Type	Description
500	LUM_PROC	R	Unsigned 16-bit	Processed fixed-point luminance data expressed in steps of 1 Lux. Measurement resolution is 1 Lux.
501	LUM_RAW	R	Unsigned 16-bit	Raw luminance data from the measurement IC (BH1721FVC). See vendor datasheet for details.

R = read (only)

Addr.	Name	R/W	Type	Description
600	AXIS_X_PROC	R	Signed 16-bit	Processed fixed-point X-axis acceleration data expressed in steps of ~0.003G. Measurement resolution is ~0.003 G.
601	AXIS_X_RAW	R	Signed 16-bit	Raw X-axis acceleration data from the measurement IC (ADXL312). See vendor datasheet for details.
602	AXIS_Y_PROC	R	Signed 16-bit	Processed fixed-point Y-axis acceleration data expressed in steps of ~0.003G. Measurement resolution is ~0.003 G.
603	AXIS_Y_RAW	R	Signed 16-bit	Raw Y-axis acceleration data from the measurement IC (ADXL312). See vendor datasheet for details.
604	AXIS_Z_PROC	R	Signed 16-bit	Processed fixed-point Z-axis acceleration data expressed in steps of ~0.003G. Measurement resolution is ~0.003 G.
605	AXIS_Z_RAW	R	Signed 16-bit	Raw Z-axis acceleration data from the measurement IC (ADXL312). See vendor datasheet for details.

R = read (only)