Appendix F - XY2-100 Protocol Interface
1040-0011 Revision 89
10.2 CLOCK
The Clock is transmitted by the position data generator, 20 cycles per frame. Its nominal frequency is
2MHz.
10.3 SYNC
The frame Sync is a single logical "0" pulse, once per frame, transmitted by the position data
generator one clock cycle prior to the first bit of the frame.
10.4 X, Y, & Z DATA
The X, Y, & Z Data are three 20-bit serial data streams consisting of a 3-bit control code, one 16-bit
position word (unsigned, MSB first), and a parity bit (even parity).
X2-100 Timing Diagram
Improper control codes, parity error, or a missing sync on the 21st clock cycle will cause the position
data word for the affected channel to be discarded. As the following table shows, 001 is the only
supported control code.
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