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These (32 + 16 * NOB) bytes above described constitute the block
containing all record data related to the interval. Therefore, the number of
blocks sent are as many as the required sample (asked by n parameter) by
the command:?FLS HH:mm,dd/MM;n or, when FTP enabled, through the
file 8061FLD.TXT (see §5.6 FTP on Area Monitor System AMS-8061).
Then, according to the mode used, either command or ftp, the behavior is as
follows:
Command query (?FLS HH:mm,dd/MM;n).
As soon as all records have been sent an additional byte (8 bit) is appended.
This additional character represents the checksum of the just sent packet.
This checksum is calculated summing up all received bytes and making
then modulo 256. This can be helpful for checking the transmission
correctness.
The reply starts with the header ("#SM FLS=*\r\n"), and it is followed by the
above mentioned packets of (32 + 16 * NOB) per each sample plus 1 byte of
checksum.
As the monitor station, when sending data, suspends all other tasks
(sending data gets highest priority) storing included, it is preferable asking
not many data at once so that the AMS-8061 is not engaged, for say, for
more than 10 seconds. Therefore, when having a lot of data to retrieve, it is
better to split up into consecutive smaller requests instead of asking the
whole block so that the AMS-8061 can service its own tasks in between
them. On the other hand, the overall transmission time will not be
significantly influenced as few millisecond are needed for sending a new
command.
FTP mode (8061FLD.TXT file).
At modem schedule a file named HH_mm_dd_MM_yy_.D61 is created (see
§5.6 FTP on Area Monitor System AMS-8061).
This file contains n*(32 + 16 * NOB) bytes (where n is the parameter present
in the file content (FLD HH:mm;dd/MM/yy;n)
SMS Messages and Commands
5-45
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