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20.4 The data logging memory can retain a total of 100 records before writing over the oldest
information. The most current data is always record number one; the next most current is
number two, etc. The oldest information, record 100, is lost when a new record is written.
The logging period is the time between data logs and can be set from 5 minutes to 999
minutes. The logging period must be set in the terminal program. Reference the
programming instructions form DE PI to set the logging period. So for example, if the logging
period is set for 60 minutes and there are 100 records, it would take 100 hours or 4.16 days
before any logged data was overwritten.
A new record is also written when a first fault occurs. If the first fault occurs between the
logging period, the first fault record will be record number one and the next scheduled record
will be number two.
20.5 The DE-2200 system uses a simple ASCII command to read the data collected. The ASCII
command must be transmitted to the monitor by the PC or PLC before it can respond. The
command is shown below. The hexadecimal values for the characters are shown only for
those using low level (assembly language) decoding and will not appear on the
communications terminal screen.
ASCII
>(01 DL 001)
HEX
3Eh 28h 30h 32h 20h 44h 4Ch 20h 30h 30h 32h 29h
COMMAND HEADER “>” (3Eh) - The command must begin with the command header.
START OF TEXT “(“ (28h) - The start of text character must be next.
NODE NUMBER 01 - 99 - The node number or address of the monitor being contacted is
next. This number is programmed by the terminal program and can be viewed or edited in
the menu screen. A two digit number from 01 to 99 can be used.
SPACE (20h) - Following the node number is an ASCII space character (not printable, value
20h) to act as a delimiter between the node number and the two character command word.
COMMAND WORD “DL” (44h, 4Ch) - The command is an upper case DL for data log.
SPACE (20h) - A space again is used as a delimiter.
RECORD NUMBER 001 - 100 - The record number is the requested record. This number
can be any number from 001 to 100. Record number 001 always contains the most recent
record, 002 the second most recent and so on. The monitor holds a maximum of 100
records in its memory before overwriting the oldest record.
END OF TEXT “)” (29h) - The end of text completes the message.