Welch Allyn Connectivity Server - Programmers guide - Manual (Page 20)

16 WACS outbound HL7 protocols Welch Allyn Connectivity Server
Overview: Outbound HL7 Vital-sign Observations module
Patient vital-sign observations are transferred to the CIS server in this manner:
1. WACS is configured to accept requests on a preconfigured TCP port (usually in the
5600-5700 range).
2. Once a connection is established between the WACS system and the CIS, and once
the optional handshake and optional authentication are complete, The HL7 session
begins.
3. WACS sends observations to the CIS in one of these ways, depending on the
configured model:
• Push model: WACS sends information to the CIS at configurable intervals
• Pull model: WACS listens for incoming queries from the CIS
The system maintains an open connection for as long as possible. Connections can
be re-established if fatal errors or program crashes occur on either end. The WACS
master program uses exit codes and return values of the interface components to
manage child processes.
Acuity System
network
Clinical information system
(CIS)
SQL database
WACS
HL7 outbound
message
Patient data
10.250.100.201:5600
Initiate connection to
WACS IP + port
Outbound HL7 patient data messaging