Contrec 515, Operation Manual

Page: 65 / 92

Communications
515 HC04 - 8 June 2007 57
The “last edit” log records the process variables at the time of the last exit
from the calibration edit mode. There is only one “last edit” log, therefore,
if a number is included in the request, the instrument ignores the number and
returns the data at the time of the last edit. Likewise, there is only one set of
current process variables with “non-accumulated totals”, therefore it also
ignores any log number included in the request.
The types of logs applicable to this instrument are as follows:
The number of the log entry is the same as shown on the front panel of the
instrument. For example, a request for LH003 would return the data for the
log entry two hours prior to the most recent hourly log entry. If the current
time is between 9:00am and 10:00am, the most recent hourly log LH001
was recorded at 9:00. Therefore, LH002 is for 8:00 and LH003 is for 7:00.
After 10:00am in this example, LH003 becomes the 8:00 log.
Instrument Responses
The instrument response time to any enquiry is not more than 300ms. The
responses from the instrument are in the following format:
HEADER
L
F
C
R
DATA
L
F
C
R
DATA
L
F
C
R
.
.
.
DATA
L
F
C
R
L
F
C
R
The components of the response message are as follows:
Log Type
LH - hourly log
LD - daily log
LW - weekly log
LM - monthly log
LY - yearly log
LE - last edit log
LN - current totals displayed as Non-accumulated