X K 3 1 9 0 - A 1
+P
The frame from the computer consists of 6 data
explanation
1
02 (X ON) start
2
A ~ Z address
3
A: Shaking hands
B: asking GW
C: asking tare
D: asking NW
E: asking accumulated times and accumulated weight
4
XRL checking
5
XRL checking
6
03 (X OFF) end
XRL = 2
⊕
3