IMO Precision Controls K7 Series - Page 179

Chapter 8 Communication Function
8-56
e) Mask setting
Masking method is as below
bit 7 bit 0
11010011
bit 7 bit 0
11111111
bit 7 bit 0
11010011
bit 7 bit 0
11010011
bit 7 bit 0
00101100
= h D3 (sum check value)
= hFF (masking value)
AND masking = hD3
OR masking = hFF
Exclusive OR masking = h2C