User's Manual
M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 50
Theory of Operation: Functional Block Diagrams
Token Ring Cable
The token ring cable carries the following signals between the BPAP board and the APIO board:
• R-wave communication
• On and off signal that switches on the outputs from the power supply (the 120 VAC output
for the PC is always on)
• Program enable and program done (on separate circuits)
• Ring in and ring out (on separate circuits)