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6.5 System behavior on communication errors
There will be an error message sent to the alarm monitor (incl. red LED at button), if a host
system does not confirm a data communication within a defined amount of time. The
unconfirmed communication records are not re-sent.
If a host receives data, but responds with a content error (e.g. checksum failed), the
erroneous sequence will be repeated. After 3 failed attempts, the communication of this
data block is aborted and an error message sent to the alarm monitor (incl. red LED at
button).
Results must be sent manually. (after correcting communication problems with the host)
7. ASTM Protocol
7.1 General ASTM Protocol Information
7.1.1 Background
ASTM (American Society of Testing and Material) has a plan for communications between
automatic analyzers and host computers for standards E1381-97 (Specification for Low-
Level Protocol to Transfer Messages Between Clinical Laboratory Instruments and
Computer Systems) and E1394-97 (Standard Specifications for Transferring Information
Between Clinical Instruments and Computer Systems). The basic specifications of the
standards are regulated on X12 of ANSI. These documents are now LIS1-A &LIS2-A2 and
are controlled by CLSI.
The host communication interface installed in the cobas c 111 instrument systems meets
the standards of ASTM.
7.1.2 Communication Processing Layers
The communication process between the system and the host is divided into three layers as
shown below. This specification explains the processing and operation methods for the
application layer.
Figure 5: Host Communication Processing Layers
Application Layer
ASTM Upper Layer
ASTM Lower Layer
Physical Layer
Service Specification Host
Communication
ASTM E1394-97
ASTM E1381-97
EIA-232-D-1986
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