Nt18b07 Manual - [work]

The NTC sensors use a thermistor, which changes resistance based on temperature. The NT18B07 converts this resistance into a digital temperature value.Given that the accuracy is within the -20∘Cnegative 20 raised to the composed with power C +125∘Cpositive 125 raised to the composed with power C

Retrieves the firmware program version . 0x26 (SYSTEM_RESET): Triggers a system reset .

Example: A reading of 255 in the register represents 25.5°C. 3.2 Configuration Registers

Before operating the NT18B07, always prioritize safety to prevent accidental discharge or injury: nt18b07 manual

NT18B07 7-channel NTC temperature interface board * Registers 0-6 contain temperature readings in 0.1 degree celcius increments. * Read the Docs NT18B07 7-channel NTC temperature interface board - Sming

Older NT18B07 models require a separate audio cable for VGA, but HDMI carries both video and audio. If HDMI has no sound, it's often a handshake issue. Solution (from manual troubleshooting table):

To request the current thermal reading from Channel 1 on a module configured with the default Slave ID of 0x01 , transmit the following Modbus payload: 01 03 00 00 00 01 84 0A 01 : Slave ID 03 : Function Code (Read Holding Registers) 00 00 : Starting Register Address (CH1) 00 01 : Number of Registers to Fetch 84 0A : Automated CRC-16 Checksum Module Response Payload (Assuming 26.8∘C26.8 raised to the composed with power C ): 01 03 02 01 0C B8 09 01 : Slave ID 03 : Function Code replicated 02 : Returned Data Byte Count 01 0C : Raw Data Payload ( 0x010C Hex = 268 Decimal 26.8∘C26.8 raised to the composed with power C ) B8 09 : CRC-16 Verification Checksum Example 2: Altering the Module Device Address (Slave ID) The NTC sensors use a thermistor, which changes

If the register returns 0x00FA (decimal 250), divide by 10 to obtain 25.0°C .

Up to 247 modules can theoretically be cascaded. However, if your chain exceeds 16 hardware modules , signal degradation will occur. You must integrate an active RS485 repeater to maintain signal integrity over long lines.

When linking the module to an ESP32/ESP8266, configure the UART and modbus controller in YAML. The configuration requires setting the appropriate UART pins, 9600 baud rate, and creating a lambda function to convert 2-byte register values into floating-point temperatures, properly handling two's complement for negative values. Example: A reading of 255 in the register represents 25

(Note: model features and labels can vary; this guide assumes the common NT18B07 feature set.)

A returned register decimal integer of 254 corresponds to 25.4∘C25.4 raised to the composed with power C .