modbus: id: modbus1 uart_id: uart_bus
Typically measures from -20°C to +125°C with a 1% accuracy level when used with standard NTC sensors.
Values are structured as two's complement. If the raw value exceeds 32767 ( 0x7FFF ), subtract 65536 and divide by 10. For example, a raw reading of 0xFF9C translates to a decimal value of 65436. Subtracting 65536 yields -100, which evaluates to -10.0°C . Advanced Multi-Device Cascading
The NT18B07 is often used in Home Assistant for monitoring multiple temperature points.
To change operational logic, press and hold the button for 3 seconds. The display will change to show P0 . Use the (+) and (-) buttons to cycle through the menus ( P0 through P6 ), and press SET to enter a specific menu. Parameter Name Setting Range Default Value Description P0 Cooling / Heating Mode nt18b07 manual
Serial UART (TTL level or RS232 depending on model). Operating Frequency: 125KHz.
Industrial standard temperature ranges. 2. Pinout Configuration
Manchester encoding 125KHz RFID cards (e.g., EM4100, EM4001). Communication Parameters: Baud Rate: 19200 bps (Default). Data Bits: 8. Stop Bit: 1. Parity: None.
Prevents users from accidentally setting the target temperature too high. Lowest Lower Limit For example, a raw reading of 0xFF9C translates
The is a highly versatile, industrial-grade 7-channel RS485 NTC temperature acquisition module designed for seamless integration with PLCs, paperless recorders, and smart home automation systems like Home Assistant. Operating over a broad DC 6–24V power supply, this compact hardware unit uses the standard Modbus RTU protocol to convert raw analog thermal readings from up to seven independent negative temperature coefficient (NTC) thermistors into highly accurate digital data.
: ultra-low draw of 8–15 mA (fluctuates slightly based on the number of actively polled channels).
The module handles negative values via standard two's complement notation. If the returned hexadecimal value is 0xFF38 , converting this signed 16-bit integer yields -200 , which equates to a true reading of -20.0∘Cnegative 20.0 raised to the composed with power C . Step-by-Step Command Configurations Example 1: Reading Temperature from Channel 1
B3950 10K 1% NTC thermistors (Requires accurate specifications for proper operation). To change operational logic, press and hold the
Proper wiring is crucial to prevent damaging the module. The NT18B07 operates on a 6-24V DC input and relies on a 2-wire RS485 bus. 2.1 Terminal Layout DC Power Positive (6-24V) GND: Power Ground / RS485 Ground A+: RS485 D+ B-: RS485 D- T1 - T7: NTC Thermistor Channels (Two pins per channel) 2.2 NTC Sensor Connection The module requires 10K NTC thermistors with a -value of 3950.
Ensure the NTC sensor used is 10K B3950. A 1% sensor is recommended for accuracy.
DC 6V to 24V (Optimized for standard 9V, 12V, 15V, and 24V rails) 8mA to 15mA (Dependent on the active channel count) Communication Interface RS485 Serial Interface (A / B Differential Pair) Protocol Support Standard Modbus RTU (Function Codes 03 and 06 ) Default Serial Settings
Lost the manual? Here are solutions to the top 5 problems owners of the NT18B07 face.
This is the most frequent issue when setting up Modbus devices. The root cause is often a configuration mismatch.
The NT18B07 responds exclusively to standard Modbus RTU frame queries. Data packets are verified sequentially via a standard algorithm to ensure error-free transmission. Register Address Mapping