# Detailed description of GET\_TEMP\_SPECIAL(3A) OUT | 07 | 11 | 3A | GRP | ID | ID TO | CRC | | -- | -- | -- | --- | -- | ----- | --- | IN | 13 | 10 | 4A | GRP | ID | ID TO | CRC | Sensor Type | New Value | T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | CRC | | -- | -- | -- | --- | -- | ----- | --- | ----------- | --------- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --- | *NOTE* Command 3C should be used for querying sensors on indexes greater than 0. The command 3A shall still be available for all old and new sensor types and will return information for the sensor on index 0. ## Parameters:


Sensor Type	AB – Dallas temp sensor DS1821 10 – Dallas temp sensor DS18S20 28 – Dallas temp sensor DS18B20 64 – PT100 temp. 65 – PT1000 temp. 53 – SHT71
New value	Status of value 00 New 01…FF Old
T1	Depending on sensor
T2	Depending on sensor
T3	Depending on sensor
T4	Depending on sensor
T5	Depending on sensor
T6	Depending on sensor
T7	Depending on sensor
T8	Depending on sensor
T9	Depending on sensor

### 10 - (DS18S20) S\_INX=0


T1	TEMP	Temperature high
T2	TEMP	Temperature low
T3	NA	Not in use
T4	CNT R_1	Counter remain low
T5	NA	Not in use
T6	CNT PD_1	Counter per degree low
T7	S CAL	Status of calibration FF done, 00 not calibrated.
T8	CAL0	Calibration value high
T9	CAL1	Calibration value low

### 28 – (DS18B20) S\_INX=0


T1	TEMP	Temperature high (upper 4 bits of temperature)
T2	TEMP	Temperature low (lower 8 bits of temperature)
T3	NA	Not in use
T4	NA	Not in use
T5	NA	Not in use
T6	NA	Not in use
T7	S CAL	Status of calibration FF done, 00 not calibrated.
T8	CAL0	Calibration value high
T9	CAL1	Calibration value low

(See DS18B20 datasheet for information on temperature format) ### 53 – (SHT71) S\_INX=0


T1	HUM	Humidity high
T2	HUM	Humidity low
T3	TEMP	Temperature high
T4	TEMP	Temperature low
T5	NA	Not in use
T6	NA	Not in use
T7	S CAL	Status of calibration FF done, 00 not calibrated.
T8	CAL0	Calibration value high
T9	CAL1	Calibration value low

### 53 – (SHT71) S\_INX=1


T1	TEMP	Temperature high
T2	TEMP	Temperature low
T3	NA	Not in use
T4	NA	Not in use
T5	NA	Not in use
T6	NA	Not in use
T7	S CAL	Status of calibration FF done, 00 not calibrated.
T8	CAL0	Calibration value high
T9	CAL1	Calibration value low

### 64 or 65 - (Pt100/1000) S\_INX=0


T1	ADC_HI_BYTE	Raw ADC reading high
T2	ADC_LO_BYTE	Raw ADC reading low
T3	NA	Not used
T4	NA	Not used
T5	NA	Not used
T6	NA	Not used
T7	S CAL	Status of calibration FF done, 00 not calibrated.
T8	CAL0	Calibration value high
T9	CAL1	Calibration value low

### AB - (DS1821) S\_INX=0


T1	TEMP	Temperature high
T2	TEMP	Temperature low
T3	CNT R_0	Counter remain high
T4	CNT R_1	Counter remain low
T5	CNT PD_0	Counter per degree high
T6	CNT PD_1	Counter per degree low
T7	S CAL	Status of calibration FF done, 00 not calibrated.
T8	CAL0	Calibration value high
T9	CAL1	Calibration value low

### Remarks for type 53 1\. Treat T=(temp high : temp low) and H=(hum high : hum low) as 16 bits unsigned numbers in following equations to compute correct values of temperature and humidity.\ Humidity=-4.0+0.0405\*H-2.8\*10^-6\*H^2\ Temperature=-39.6+0.01\*T ### Remarks for type 64 and 65 1\. After temperature node power on the temperature sensor is detected. The 'Sensor Type' byte is set to: 0x10 - DS18S20 0x28 - DS18B20 0x64 - PT100 0x65 - PT1000 0xAB - DS1821 0xAA - no temperature sensor 0x53 – SHT 7xx 2\. Raw 16 bit ADC reading is sent on T1 and T2. ADC = 256 \* ADC\_HI\_BYTE + ADC\_LO\_BYTE Resistance can be calculated from the formula: For 0x64 (PT100): R = 3.576e-3 \* ADC - 0.13 for 0x65 (PT1000): R = 57.22e-3 \* ADC - 0.13 Temperature can be calculated from the formula: for 0x64 (PT100): R = 100 \* (1 + A \* t + B \* t^2) for 0x65 (PT1000): R = 1000 \* (1 + A \* t + B \* t^2) where A = 3.9083e-3 B = -5.775e-7 3\. The present solution accepts both PT100 and PT1000 (the amplification is changed automatically). For both sensor types the range is -200 to +300 degrees and accuracy +/- 0.5 degree 4\. The accuracy may be enhanced if calibration is implemented. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.boomerang3.com/s2-radio-system-manual/s2-system-description/s2-node/s2-communication-protocol/detailed-description-of-get_temp_special-3a.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.