How do I change from multipoint to AT mode?

The procedure is similar to changing from AT to multipoint mode, and in fact the same S Register sets are used

in the same way. The steps are as follows:

Send a ‘Read S Reg’ packet to read S register 126 (0×7E)

The response is always a 32 bit value. In this case leave the first 2 bytes as 0 and then calculate the 1’s complement of the last 2 bytes of the S reg value, using the enclosed “1sComplement.exe” application. Run the program and simply enter the returned value from Step 3 and press Calculate to achieve the required conversion.

Send a ‘Write S Reg’ packet to write S register 126 with the value calculated in step 2

Send a ‘Write S Reg’ packet to write S register 127 with the value 00000100