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)