[Jason Hogan]

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Random values usually happen due to register address offsets or mismatched serial settings.

Try these quick fixes:

Check Register Addresses:

Temperature: 0x0001 (or 1 Decimal).

Humidity: 0x0002 (or 2 Decimal).

Delta Tip: If the data looks wrong, shift the address down by 1 to 0x0000.

Divide by 10:

The sensor sends values scaled by 10. A raw reading of 255 means 25.5°C.

Check COM Port Settings (D1120):

Default SHT20/MD02 settings are usually 9600 baud, 8 data bits, No parity, 1 stop bit (8, N, 1), Slave ID = 1. Ensure D1120 in Delta matches this.

WPLSoft Instruction:

Use the standard read instruction: MODRD K1 H1 K2 (Slave ID 1, Register 0x0001, Read 2 Registers).

• This reply was modified 3 days, 23 hours ago by  Jason Hogan.
• This reply was modified 3 days, 23 hours ago by  Jason Hogan.