Appendix C Communication Parameters - IBM SummaSketch II Plus User Manual

Appendix C
Communication Parameters
SummaSketch (MM) Format
Fonnat: RS-232-C
Baud rate: 9600
Number of data bits: eight
Parity bit: odd
Number of stop bits: one
Data fonnat:
MSB
LSB
Transmit
7 6 5 4 3
2 0
Sequence
PH PR
T
Sx Sy Fe Fb
Fa
1st byte
0 X6
XS
X4 X3 X2 XI XO 2nd byte
0 Xl3 Xl2 XII XIO X9 XS X7 3rd byte
0
Y6 Y5 Y4 Y3 Y2 YI
YO
4th byte
0 Yl3 Yl2 YI! YlO Y9 Y8 Y7 5th byte
Key:
LSB
is the least significant bit.
MSB
is the most significant
bit.
Fa, Fb, and Fe are the flag bits. They ide ntify the status of the
stylus and cursor buttons.
Stylus Cursor Buttons Fe
Fb Fa
none pressed none pressed
()
() 0
tip button
I
0 0
I
barrel button
2 () 0
tip and barrel
3
0 I I
4
() 0
1+2
0 I I
1+3
()
0
1+4
0
2+3 ()
2+4
()
1+2+3 0
1+2+4
2+3+4
1+2+3+4
IJ