CT-N 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 : 97) (*)

R/W

40,002

0x9C42

1

Object temperature

R

40,003

0x9C43

1

Ambient temperature

R

40,004

0x9C44

1

Average Filter ( 1~10, default : 10 ) (**)

R/W

*: “97” means emissivity “0.97”. To adjust the emissivity to 0.95, write 95 not 0.95.

**: number of average filter array elements. Affected by noise reduction of Object temperature and peak temperature measurement time.

Time to peak temperature: up to 1 sec (default: 10)

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.

0x016D(read data) = 365(dec) → means 36.5℃

0xFFF1(read data) → 0x000F(two’s complement)=15 → means -1.5℃

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.

※ Output Data Limit

Model

Temperature range

CT-200N-485

-20 … 450℃

CT-300N-485

-20 … 550℃

CT-1000N-485

-20 … 1100℃

Request cycle

≥100ms

5~15 ms

Response delay

Request

Response: ≤10ms