SpO
2
Interface Board (Nellcor, Nell-3
™
and Masimo) Theory of Operation
2 - 54 0070-10-0441 Passport 2®/Passport 2 LT™ Service Manual
2.16 SpO
2
Interface Board (Nellcor, Nell-3
™
and Masimo)
The SpO
2
Interface board provides the communications path for the two-way data flow
between the SpO
2
modules and the Passport 2 CPU Control Module. The SpO
2
module
analyzes the analog input from the SpO
2
sensor and outputs the data in digital format via a
serial digital interface.
The SpO
2
Interface board addresses the different power requirements, as well as the
different connector pin assignments for each of the three SpO
2
modules.
The SpO
2
interface board provides SCI UART host communication to the SpO
2
modules. It
serves simply as an adapter. The signals pass through unchanged.
The SpO
2
interface board will be specifically configured for the SpO
2
module it is
interfacing with. This may include different jumper settings, different feedback resistor
options, custom ribbon cables, etc.
Patient isolation is provided on the Passport 2 CPU Control Module, so it is not needed on
this SpO
2
interface board.
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