CT-G Series Specification

Compact Non-contact Infrared Thermometer

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Modbus-RTU Register Table

- BaudRate: 19,200 bps(fixed), data bit: 8, stop bit: 1, parity: none, flow control: none.

- R = Read

- W = Write (single write)

Address

Length

(short)

Description

R/W

Dec

Hex

40,000

0x9C40

1

Device ID (1 ~ 200), Modbus broadcast not supported.

R/W

40,001

0x9C41

1

Emissivity (10~100. default : 99) (*)

R/W

40,002

0x9C42

1

Object temperature

R

40,003

0x9C43

1

Ambient temperature

R

*: “99” means emissivity “0.99”. To adjust the emissivity to 0.98, write 98 not 0.98.

Support Modbus function codes

- Read Holding Registers 03 (0x03)

- Write Single Register: 06 (0x06)

Object Temperature: To, Ambient Temperature: Ta

To is the object temperature derived from thermopile and ambient sensor outputs.

Ta stands for ambient temperature.

0x3BFB(read data) = 15,355(dec) → 15,355 * 0.02 - 273.15 = 33.95℃

0x3365(read data) → 13,157(dec) → 13,157 * 0.02 - 273.15 = -10.01℃

Output Data limit (object temperature): -19.99℃ … 105.01℃

Request & Response timing

- Request cycle: ≥100ms

- First data request time after Power-on: ≥ 1 sec

- Timeout: ≥ 25ms

Note. If there is an error in the request sequence (including crc), there is no response data.

Products handling precaution

※ When it comes to dust removal by air, the best method is to use a blower, and to avoid using compressed air.

※ Do not press the lens with your hands or any other object.

※ Do not scratch the lens surface with sharp objects.

※ Voluntary disassembly and modification of the product is prohibited.

※ Avoid direct sunlight, chemical substance, heat or fire.

※ Water resistance is not guaranteed.

Request cycle

≥100ms

5~15 ms

Response delay

Request

Response: ≤10ms