Revision A
Dash 3000/4000 Patient Monitor
9-17
2000966-339
Assembly Drawings:
Theory Of Operation
Peripheral Expansion Interface
A 20-pin peripheral expansion interface is provided to support future
use. An active low peripheral present signal may be polled by software to
identify when a peripheral is attached to the monitor. Asynchronous,
AUX, and a switched Ethernet serial communication channels are
supported as well as sw9-18 V and +5 V power.
DAS Communication
The microprocessor communicates with the DAS processor using the
second serial communication controller (SCC) of the communication
processor module (CPM). This asynchronous communication channel
operates at TTL levels and is optically isolated within the DAS.
Optional Unity Network Communication
The microprocessor provides an Ethernet controller, which is
implemented on SCC1 in order to benefit from the additional buffer
descriptors compared to SCC2. Ethernet packets are stored in SRAM
buffers and are transmitted and received by the 10BASE-T transceiver.
The Ethernet clocks are generated from a 20 MHz crystal oscillator
circuit and the transceiver. The transceiver also provides a visual
indication in the form of four LEDS to identify packet transmit, receive,
collision, and link integrity. The status of received data is indicated by
the link integrity signal, which is used by the microprocessor to
determine if the monitor is connected to the Unity Network.
An isolation transformer provides basic insulation to the twisted pair
interface required to meet the ANSI/IEEE 802.3 standard (Ethernet).
Isolation is required because during transport the power cord with the
ground conductor is not available to provide a path for a fault condition.
An 8-pin RJ-45 connector containing two isolated, differential pairs is
provided to connect the monitor to a network hub.
NOTE
Power is not provided in the twisted pair interface as in the
attachment user interface (AUI) of other monitoring products.
Summary of Contents for Dash 3000
Page 1: ...Dash 3000 4000 Patient Monitor Service Manual 2023896 023 Revision A ...
Page 11: ...Revision A Dash 3000 4000 Patient Monitor 1 1 2000966 339 1 Introduction ...
Page 12: ...1 2 Dash 3000 4000 Patient Monitor Revision A 2000966 339 For your notes ...
Page 19: ...Revision A Dash 3000 4000 Patient Monitor 2 1 2000966 339 2 Equipment Overview ...
Page 20: ...2 2 Dash 3000 4000 Patient Monitor Revision A 2000966 339 For your notes ...
Page 45: ...Revision A Dash 3000 4000 Patient Monitor 3 1 2000966 339 3 Installation ...
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Page 55: ...Revision A Dash 3000 4000 Patient Monitor 4 1 2000966 339 4 Maintenance ...
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Page 117: ...Revision A Dash 3000 4000 Patient Monitor 5 1 2000966 339 5 Troubleshooting ...
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Page 149: ...Revision A Dash 3000 4000 Patient Monitor 6 1 2000966 339 6 Configuration ...
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Page 173: ...Revision A Dash 3000 4000 Patient Monitor 7 1 2000966 339 7 Calibration ...
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