Roche Cobas C111 - Message Transmission Phases

cobas c 111
Host Interface Manual
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2
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7.1.4.4 Message Transmission Phases
To establish which system sends and which system receives information and to ensure the
actions of sender and receiver are well coordinated, there are three distinct phases in trans-
ferring information:
• Establishment Phase
• Transfer Phase
• Termination Phase
Figure 6: Message Transmission Phases
Within the transfer phase, all records of the corresponding message are grouped into longer
frames to increase speed. The records are separated through a [CR] character. Therefore, to
obtain pure ASTM records again, the receiver must concatenate all the frames and wait for
a [EOT] character. Finally he can process the frame and split it into different records using
the [CR] as separator.
Sende
r
Receive
r
ENQ
intermediate
AC
K
AC
K
end frame
AC
K
EOT
Establishme
nt Phase
Transfer Phase
T
erminatio
n Phase