Theory of Operation High Level ECG Data Flow and Storage
8-6 PageWriter TC 70 Cardiograph Service Manual
Compact Flash Wireless LAN Card
A Compact Flash wireless LAN Card is available as an option for the PageWriter TC70.The
LAN card connects to the cardiograph through the Wireless LAN card slot and provides
standard WLAN capability and is compatible with the 802.11b/g wireless standard. The
PageWriter TC70 cardiograph communicates with the TraceMaster or TraceMasterVue ECG
Management System through the wireless PCMCIA LAN Card.
Modem Module
A modem module is available as an option for the PageWriter TC70. The modem is installed
on the I/O module and interfaces to the main board through an RS232 connection, providing
standard modem capability. The PageWriter TC70 cardiograph faxes ECG data to remote
receivers or communicates with a TraceMaster or TraceMasterVue ECG Management System
through the modem module.
WARNING Do not connect the modem card to a phone line when the cardiograph is connected to a
patient.
High Level ECG Data Flow and Storage
General ECG data flow begins with acquisition by the Patient Interface Module (PIM) from
electrodes placed on a patient. Data is streamed real-time to the main control board, where it is
received into the application buffers in RAM. These buffers are used to present the signal data
on the real-time screen. When the user initiates an Auto ECG print, the corresponding
10-second segments of the signal data are then copied to the temporary ECG storage memory
in RAM.
These 10-second segments are named ECG reports that can be previewed and printed. In the
case of Auto mode, the ECG report may be configured to automatically print. An ECG report
contains signal data, analysis information, patient demographics, and acquisition information,
along with operator and device information. See the XML Utility Suite Instructions for Use
available on the Philips InCenter site (
incenter.medical.philips.com) for a complete description of
the contents of the ECG data record. For information on using the InCenter site, see “Using the
Philips InCenter Site” on page 1-4.
If the
Save button on the cardiograph is set to Auto, the ECG report is saved in XML format to
the internal main archive. This archive is non-volatile and resides on the internal
CompactFlash (CF) card. An index files with a CDB extension is also maintained in this
archive.
From the internal main archive, the ECG XML data format files can be copied, deleted,
previewed, printed, and transferred to other devices. The internal main archive cannot receive
ECG XML files from external devices. Retrieved ECG file storage is limited to the internal
remote archive.
NOTE PageWriter TC70-generated ECG XML files comply with the Philips Medical Systems ECG XML
Schema version. They incorporate an embedded CRC32 value, which is used to ensure the data
integrity of the file.
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