System Board Components; System Board Component Overview; Secondary Input Port/Secondary Output Port (Sip/Sop); Nell-1A Oximetry Module - Nellcor OXIMAX N-600X Series Service Manual

Product Overview

System Board Components

System Board Component Overview

The OxiMax N-600x pulse oximeter Main Board (PCB) consists of three (3) main
components. These components provide support for data exchange and input from
the clinician, technician, or caregiver during use.
The three primary components are listed below.

1. Secondary Input Port/Secondary Output Port (SIP/SOP)

2. NELL-1A Oximetry Module

3. User Interface (UIF)
The Secondary Input Port/Secondary Output Port and the NELL-1A Oximetry Module
front end are both electrically isolated from the UIF.
Secondary Input Port/Secondary Output Port (SIP/SOP)
The Secondary Input Port/Secondary Output Port provides support for data
exchange to and from the oximeter via a serial port. The SIP/SOP is electrically
isolated as mandated by regulations for patient safety.
NELL-1A Oximetry Module
The OxiMax N-600x pulse oximeter contains the Motorola MPC823e PowerPC (823e)
microprocessor. As shown in the block diagram above, the 823e provides the bulk of
the functionality in the oximeter, acting as the "master" controller, while NELL-1A
Oximetry Module handles the pulse oximetry functions and the Linear Power Supply
(LPS) board microcontroller handles the AC/Battery power management tasks.
Communications between the board and the Nell-1A module takes place over an
asynchronous isolated bidirectional serial link. The microprocessor receives
messages from the NELL-1A and extracts status, SpO
Communication with the LPS board takes place over a non-isolated bidirectional
serial link. The microcontroller receives periodic status information that it uses for
directing further activity.
High-speed SRAM and Flash ROM are provided for the 823e microprocessor on the
circuit board. Low-speed SRAM is used to hold infrequently used data, primarily
trend data.
The 823e retains the primary responsibility for a variety of functions.
•
Processing of the oximetry data
•
Display of theSpO
on the membrane panel
•
User Interface
•
Serial port communication through the SIP/SOP interface
•
Nurse call outputs
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and pulse rate data, and all other display data including status LEDs
2
10030881 Rev. B 12-2008
or call 1-800-674-3655
and pulse rates.
2
Service Manual