Time Synchronization
Efficia CM Series Data Export Guide 4-1
4
Time Synchronization
This chapter describes how the Efficia CM Series patient monitors synchronize with the
clock on the EHR server or HL7 interface server.
Note — If you have a Simple Network Time Protocol (SNTP) server running in your
hospital network, you can configure the monitor to synchronize its clock with
that server. For more information, see the Efficia CM Series Patient Monitors
Installation and Configuration Guide.
• If your monitor is configured for LAN data export, the monitor clock can be
synchronized with the clock on your EHR system, HL7 interface server, or SNTP
server.
• If your monitor is configured for serial data export, the monitor clock can be
synchronized with the clock on the computer that receives the serial data from
the monitor.
During the data export process, the monitor sends patient data to the receiving system,
and then expects an Acknowledgement (ACK) message from the receiving system
indicating that the patient data was received and validated. The Message Header
(MSH) segment of the ACK message contains a timestamp, shown in bold type in the
following example:
MSH|^~\&|||||20140501002459||ACK^^ACK_ALL|398098728972|P|2.4
Maintaining Synchronization on a LAN System
To keep the clock updated on a wired LAN network, the monitor automatically sends a
“blank” Observation Received (ORU) message to the receiving system each time the
monitor is turned on and once every hour, as long as the monitor is turned on. This
ensures that the monitor clock remains synchronized with the central clock, even
during times when the monitor is not actively exporting patient data.
The blank ORU message contains only a Message Header (MSH) segment; it does not
contain any patient data, such as PID, PV1, or OBX segments.
Example:
MSH|^~\&|^EfficiaCM||||20140510052137||ORU^R01^ORU_R01|USWIFILP022012
051005|P|2.4|||||||||2.16.840.1.113883.9.2.1
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