Modbus - Thermocouple Bricklet 2.0¶

Basic Functions¶

BrickletThermocoupleV2.get_temperature¶

Function ID:	1
Request:	empty payload
Response:	temperature – Type: int32, Unit: 1/100 °C, Range: [-21000 to 180000]

Returns the temperature of the thermocouple. The value is given in °C/100, e.g. a value of 4223 means that a temperature of 42.23 °C is measured.

If you want to get the temperature periodically, it is recommended to use the CALLBACK_TEMPERATURE callback and set the period with set_temperature_callback_configuration.

If you want to get the value periodically, it is recommended to use the CALLBACK_TEMPERATURE callback. You can set the callback configuration with set_temperature_callback_configuration.

Advanced Functions¶

BrickletThermocoupleV2.set_configuration¶

Function ID:	5
Request:	averaging – Type: uint8, Range: See meanings, Default: 16 thermocouple_type – Type: uint8, Range: See meanings, Default: 3 filter – Type: uint8, Range: See meanings, Default: 0
Response:	no response

You can configure averaging size, thermocouple type and frequency filtering.

Available averaging sizes are 1, 2, 4, 8 and 16 samples.

As thermocouple type you can use B, E, J, K, N, R, S and T. If you have a different thermocouple or a custom thermocouple you can also use G8 and G32. With these types the returned value will not be in °C/100, it will be calculated by the following formulas:

• G8: value = 8 * 1.6 * 2^17 * Vin
• G32: value = 32 * 1.6 * 2^17 * Vin

where Vin is the thermocouple input voltage.

The frequency filter can be either configured to 50Hz or to 60Hz. You should configure it according to your utility frequency.

The conversion time depends on the averaging and filter configuration, it can be calculated as follows:

• 60Hz: time = 82 + (samples - 1) * 16.67
• 50Hz: time = 98 + (samples - 1) * 20

The following meanings are defined for the elements of this function:

For averaging:

• 1 = 1
• 2 = 2
• 4 = 4
• 8 = 8
• 16 = 16

For thermocouple_type:

• 0 = B
• 1 = E
• 2 = J
• 3 = K
• 4 = N
• 5 = R
• 6 = S
• 7 = T
• 8 = G8
• 9 = G32

For filter:

• 0 = 50Hz
• 1 = 60Hz

BrickletThermocoupleV2.get_configuration¶

Function ID:	6
Request:	empty payload
Response:	averaging – Type: uint8, Range: See meanings, Default: 16 thermocouple_type – Type: uint8, Range: See meanings, Default: 3 filter – Type: uint8, Range: See meanings, Default: 0

Returns the configuration as set by set_configuration.

The following meanings are defined for the elements of this function:

For averaging:

• 1 = 1
• 2 = 2
• 4 = 4
• 8 = 8
• 16 = 16

For thermocouple_type:

• 0 = B
• 1 = E
• 2 = J
• 3 = K
• 4 = N
• 5 = R
• 6 = S
• 7 = T
• 8 = G8
• 9 = G32

For filter:

• 0 = 50Hz
• 1 = 60Hz

BrickletThermocoupleV2.get_error_state¶

Function ID:	7
Request:	empty payload
Response:	over_under – Type: bool open_circuit – Type: bool

Returns the current error state. There are two possible errors:

• Over/Under Voltage and
• Open Circuit.

Over/Under Voltage happens for voltages below 0V or above 3.3V. In this case it is very likely that your thermocouple is defective. An Open Circuit error indicates that there is no thermocouple connected.

You can use the CALLBACK_ERROR_STATE callback to automatically get triggered when the error state changes.

BrickletThermocoupleV2.get_spitfp_error_count¶

Function ID:	234
Request:	empty payload
Response:	error_count_ack_checksum – Type: uint32, Range: [0 to 232 - 1] error_count_message_checksum – Type: uint32, Range: [0 to 232 - 1] error_count_frame – Type: uint32, Range: [0 to 232 - 1] error_count_overflow – Type: uint32, Range: [0 to 232 - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

• ACK checksum errors,
• message checksum errors,
• framing errors and
• overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

BrickletThermocoupleV2.set_status_led_config¶

Function ID:	239
Request:	config – Type: uint8, Range: See meanings, Default: 3
Response:	no response

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Status

BrickletThermocoupleV2.get_status_led_config¶

Function ID:	240
Request:	empty payload
Response:	config – Type: uint8, Range: See meanings, Default: 3

Returns the configuration as set by set_status_led_config

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Status

BrickletThermocoupleV2.get_chip_temperature¶

Function ID:	242
Request:	empty payload
Response:	temperature – Type: int16, Unit: 1 °C, Range: [-215 to 215 - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

BrickletThermocoupleV2.reset¶

Function ID:	243
Request:	empty payload
Response:	no response

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

BrickletThermocoupleV2.get_identity¶

Function ID:	255
Request:	empty payload
Response:	uid – Type: char[8] connected_uid – Type: char[8] position – Type: char, Range: ['a' to 'h', 'z'] hardware_version – Type: uint8[3] 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] firmware_version – Type: uint8[3] 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] device_identifier – Type: uint16, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. 

Callback Configuration Functions¶

BrickletThermocoupleV2.set_temperature_callback_configuration¶

Function ID:	2
Request:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: int32, Unit: 1/100 °C, Range: [-231 to 231 - 1], Default: 0 max – Type: int32, Unit: 1/100 °C, Range: [-231 to 231 - 1], Default: 0
Response:	no response

The period is the period with which the CALLBACK_TEMPERATURE callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the CALLBACK_TEMPERATURE callback.

The following options are possible:

Option	Description
'x'	Threshold is turned off
'o'	Threshold is triggered when the value is outside the min and max values
'i'	Threshold is triggered when the value is inside or equal to the min and max values
'<'	Threshold is triggered when the value is smaller than the min value (max is ignored)
'>'	Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

BrickletThermocoupleV2.get_temperature_callback_configuration¶

Function ID:	3
Request:	empty payload
Response:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: int32, Unit: 1/100 °C, Range: [-231 to 231 - 1], Default: 0 max – Type: int32, Unit: 1/100 °C, Range: [-231 to 231 - 1], Default: 0

Returns the callback configuration as set by set_temperature_callback_configuration.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

Callbacks¶

BrickletThermocoupleV2.CALLBACK_TEMPERATURE¶

Function ID:	4
Response:	temperature – Type: int32, Unit: 1/100 °C, Range: [-21000 to 180000]

This callback is triggered periodically according to the configuration set by set_temperature_callback_configuration.

The response value is the same as get_temperature.

BrickletThermocoupleV2.CALLBACK_ERROR_STATE¶

Function ID:	8
Response:	over_under – Type: bool open_circuit – Type: bool

This Callback is triggered every time the error state changes (see get_error_state).

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

BrickletThermocoupleV2.set_bootloader_mode¶

Function ID:	235
Request:	mode – Type: uint8, Range: See meanings
Response:	status – Type: uint8, Range: See meanings

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following meanings are defined for the elements of this function:

For mode:

• 0 = Bootloader
• 1 = Firmware
• 2 = Bootloader Wait For Reboot
• 3 = Firmware Wait For Reboot
• 4 = Firmware Wait For Erase And Reboot

For status:

• 0 = OK
• 1 = Invalid Mode
• 2 = No Change
• 3 = Entry Function Not Present
• 4 = Device Identifier Incorrect
• 5 = CRC Mismatch

BrickletThermocoupleV2.get_bootloader_mode¶

Function ID:	236
Request:	empty payload
Response:	mode – Type: uint8, Range: See meanings

Returns the current bootloader mode, see set_bootloader_mode.

The following meanings are defined for the elements of this function:

For mode:

• 0 = Bootloader
• 1 = Firmware
• 2 = Bootloader Wait For Reboot
• 3 = Firmware Wait For Reboot
• 4 = Firmware Wait For Erase And Reboot

BrickletThermocoupleV2.set_write_firmware_pointer¶

Function ID:	237
Request:	pointer – Type: uint32, Unit: 1 B, Range: [0 to 232 - 1]
Response:	no response

Sets the firmware pointer for write_firmware. The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletThermocoupleV2.write_firmware¶

Function ID:	238
Request:	data – Type: uint8[64], Range: [0 to 255]
Response:	status – Type: uint8, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by set_write_firmware_pointer before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletThermocoupleV2.write_uid¶

Function ID:	248
Request:	uid – Type: uint32, Range: [0 to 232 - 1]
Response:	no response

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

BrickletThermocoupleV2.read_uid¶

Function ID:	249
Request:	empty payload
Response:	uid – Type: uint32, Range: [0 to 232 - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.