| 摘要 |
A method and system of establishing communications between at least two i ndependent software modules in a safety critical system, such as a medical s ystem, is provided. The design comprises providing a media connection betwee n software modules, wherein the software modules employ a communications pro tocol and participate in a bi-directional master-slave relationship between a master module and a slave module. The design further comprises sending arb itrary data between the master and slave modules, wherein the arbitrary data is used by the master module to control and obtain status from the slave mo dule, and sending arbitrary data further enables the slave module to return data and status information to the master module. The design also employs a safety critical communications watchdog between the master and slave modules , wherein the safety critical communications watchdog monitors communication s quality between the master and slave modules. The bandwidth efficient comm unications protocol comprises bytes transmitted using a packet consisting of a start indication, a message identifier, an optional service identifier, a class identifier, an optional length of data pertinent to the medical devic e, a checksum, and a checksum complement.
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