RS-WS-N01-8 Modbus Temperature and Humidity sensor

ondrej1024 · April 7, 2018, 2:17pm

Here is the source code of the utility I wrote for changing slave address and baudrate. You will find the message format in the comments.

github.com

Telegea/Smarthub-software/blob/master/src/modules/mbrtud/test/thconf.c

/*****************************************************************
 * T/H sensor configuration tool
 * 
 * This tool is used to change the baudrate and slave address 
 * settings of the Modbus T/H sensor PKTH100B. 
 * 
 * This sensor is available from chinese online stores under 
 * various names and from different manufacturers. This tool 
 * might work also for other similar sensors or it might not.
 * 
 * In order to change the communication settings of the sensor, a
 * NON STANDARD extension of the Modbus "Write Single register"
 * message is used.
 * 
 * Author: Ondrej Wisniewski
 * 
 * Build with this command:
 * gcc thconf.c -o thconf -lmodbus
 * 
 * History:

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