of 61 Host Interface Manual for use in the US
Figure 8: Establishment phase
In case of error, there are additionally three options for the receiver to respond
(1) Receiver sends characters These characters are normally sent by using ASCII code 15hex [NAK]
other than [ACK]. when the receiver is busy. The sender waits for a certain length of
time, e.g., the cobas e 411 analyzer waits for 10 seconds, and tries to
establish with another [ENQ]. The cobas e 411 analyzer repeats this
cycle until the number of retries after error reaches six.
(2) Receiver sends [ENQ] The status in which both sender and receiver are trying to change their
status to the sender is called Link Contention in ASTM. When in link
contention, it is defined that communication information of the cobas
e 411 analyzer has a priority. So that HOST must stop sending [ENQ]
and must respond simultaneously by [ACK] or [NAK] when the Link
Contention is detected. On the other hand, the cobas e 411 analyzer
waits for 1 second and replies [ENQ]. The sender repeats this cycle
until receiving characters such as [ACK] or [NAK].
(3) No response from. The sender starts Termination Phase by sending ASCII code 04hex
receiver [EOT] after waiting for 15 seconds, and displays an error message.
(4) Successful procedure of
Establishment Phase is
mentioned above.
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