Once connected, the following registers can be used to collect data and change the sensor’s Modbus address.
|Function 0x04 (Read input registers)|
|Registers||Data Type||Data Size||Purpose|
|0x0006,0x0007||Float||2 registers||Requests the temperature recorded by the T-Node FR in Celsius|
Ex. FB, 04, 00, 06, 00, 02, 85, 90
Requests the Celsius temperature reading of a T-Node FR from the universal Modbus address of 251.
|Function 0x10 (Write multiple registers)|
|Register||Data Type||Data Size||Purpose|
|0x1000||Integer||1 register||Changes the Modbus Address of the T-Node FR to the send data|
Ex. FB, 10, 10, 00, 00, 01, 02, 00, 05, 0D, 36
Changes a T-Node FR at the universal Modbus address of 251 to a new address of 5.
The T-Node FR is programmed such that any sensor will respond to Modbus address 251. This is implemented for the event that the sensor’s current address is unknown. This address should only be queried with one sensor connected to the data line. If more than one sensor is connected, both will respond and a bad message is likely.