Data Sheet

Commands

Command Action

0x38 Get serial number - returns 8 byte ASCII formatted serial number

0x5A Get module info - returns 2 bytes. Module Id (37 for USB-TPA64), Firmware version.

0x5B Get all temperatures - returns 130 bytes, described below

0x5C Get thermister temperature – returns 2 bytes, described below

0x5D Get thermopile temperatures – returns 128 bytes, described below

0X5B – Get all temperatures returning 130 bytes

The first two bytes contain the onboard thermistor temperature. Each bit is 0.0625°C, signage in bit 3 of the high byte

Byte 0

Thermistor low byte

T7 T6 T5 T4 T3 T2 T1 T0

Byte 1

Thermistor high byte

x x x x +/- T10 T9 T8

Temperature Binary number HEX number

+125℃ 0111_1101_0000 0x7D0

+25℃ 0001_1001_0000 0x190

+0.25℃ 0000_0000_0100 0x004

0℃ 0000_0000_0000 0x000

-0.25℃ 1000_0000_0100 0x804

-20℃ 1001_0100_0000 0x940

The next 128 bytes containing 64 temperatures returned from the thermopile array. Data is in 2’s compliment

form Each bit is 0.25°C, signage in bit 3 of the high byte

Byte x (2 to 128)

Thermopile cell low byte

T7 T6 T5 T4 T3 T2 T1 T0

Byte x+1 (3 to 129)

Thermopile cell high byte

x x x x +/- T10 T9 T8

Temperature Binary number HEX number

+125℃ 0001_1111_0100 0x1F4

+25℃ 0000_0110_0100 0x064

+0.25℃ 0000_0000_0001 0x001

0℃ 0000_0000_0000 0x000

-0.25℃ 1111_1111_1111 0xFFF

-25℃ 1111_1001_1100 0xF9C

-55℃ 1111_0010_0100 0xF24