FujiFilm FRENIC5000G11S Series, Technical Information

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2-54
Chapter 2
4. Standard RS-485 Interface
4.4.3 Procedure on the host side
As for the communication procedure of frames, follow the flow
chart of each procedure.
Be sure to send next frame after recognizing the response in
both writing and reading. If response from the inverter does
not return exceeding a definite time, judge as time-out and
execute retry. (When stating retry before time-out, the request
frame cannot be normally received.)
Note: Since the time described above is not the guaranteed response
time, but is surely the time of time-out for detecting abnormal,
the response is returned earlier than that time.
Description) Retry
In the retry treatment, it is confirmed either to send the former
data before no response again or to obtain a normal response
by polling (M26) for reading out the error content. (When
confirming, it is necessary to judge time-out again or not.)
In a case of normal response, since this shows any transiently
abnormal transmission by noise etc., the communication can
be normally performed after this. (If this phenomena frequently
occurs, investigation is necessary since there is a possibility of
any abnormality.)
In a case of no response again, retry further. When the times
of retrying exceed the pre-determined value (normally about 3
times), the problem in the hardware and the software of the
upstream unit is expected. The investigation is necessary after
abnormal ending as no response of the designated station.
Time-out
R Reading all
W Writing function
data (S08 -S11)
Writing function
data
Other writing
A Writing function
data (S08 - S11)
Writing function
data
E Alarm reset
a-f, m Selecting (option
frame)
g-k Polling (option
frame)
Command
Treatment Time-out Remarks
0.1s
1s
10s Data initializing (H03)
Auto-tuning (P04, A13)
1s Functions except above
1s
1s
1s
1s
0.1s
(1) Polling procedure
Send request frame
Detect transmission abnormal
Send again correcting to the
normal format
No
Yes
Yes
Send again correcting to the
normal command
Yes
Send again correcting to the
normal function code
Yes
Yes
No
No
No
No
ACK response?
Receive response frame?
Start
Function code error?
Function error?
Command error?
Abnormal end
Normal end
Chapter02J(P44˜74).p65
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