Datascope Accutorr Plus Service Manual page 23

Theory of Operation
The isolated DC/DC converter, T1, supplies the regulated +5DIG as required by the
Masimo ® MS-3 Pulse Oximetry module. The digital 5V is then utilized to generate the
analog 15V used by the MS-3. The optocouplers (U1 and U2) isolate the signals used for
bidirectional serial communication with the Masimo ® MS-3 Pulse Oximetry module.
Control signal SpO
serial transmission for future options. All data and control lines interfaced to the SpO
module are opto-isolated. Power to the SpO
with the input coming directly from the CPU/LED module.
Accutorr Plus Service Manual
COMM at J4 will allow the Accutorr Plus software to interrupt the
2
module is isolated by a DC/DC converter
2
0070-10-0691
SpO Processor Circuit Boards
2
2
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