Response To Information Message - Hitachi 902 Service Manual

16.4.3 Response to Information Message

Described below are the typical procedure for returning a response to the information message
and the procedure upon receiving the response.
When there is no information to be sent (analyzer ↔ host)
(1)
Transfer of communication control message (analyzer ↔ host)
(2)
Transfer of test selecting information (analyzer ↔ host)
(3)
Transfer of analytical data (analyzer → host)
(4)
Resending request (analyzer ↔ host)
(5)
When there is no Information to be Sent (analyzer ↔ host)
(1)
Transfer sequence
ANY
Analyzer
HOST
The analyzer continues returning the ANY frame in response to the MOR frame from the
host so as to respond to the request from the host at any time even when the analyzer
and host have no information to be sent (NOTE 1).
In this case, the analyzer sends the ANY frame at one communication cycle or longer
(NOTE 2) after receiving the MOR frame from the host (at time point when the final end-
of-data code is recognized).
NOTES: 1.
2.
Communication
Within communication
cycle or longer
cycle (NOTE 2)
(NOTE 2)
ANY
MOR
When the following conditions are satisfied:
(a) There is no test selecting information to be sent to the host.
(b) Analytical data is not output in the real-time mode.
(c) There is no request for the RES frame.
(d) Specification through the screen is not made.
This time period is changeable on the communication parameter screen.
Default value is 2 sec.
ANY
MOR
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