Datalogic DLR-TL001, Product Reference Manual

Product Reference Guide

                           7

Chapter 2

Histogram Description

Histogram Functional Setup

The Processor of DLR-TL001 is dedicated to acquire & store, check, perform 

calculation, format data, output to a Reader the most urgent & significant 

items, starting from the temperatures sampled in a very flexible and pro-

grammable way. Statistics, Means, Alarms, are processed by using an "HIS-

TOGRAM BINS DATA SCHEME" that reduces the active current consumption 

time. Note that the given register names here below will be fully explained 

later in the 

"Register Description" 

on page 14.

The DLR-TL001 tag is allowed to define up to 16 different histograms bins. 

First, for each histogram its counter could be enabled/disabled by a flag bit 

belonging to the BIN_ENABLE register. The user is able to decide the upper 

and lower temperature limits for each histogram bin "X": the lower limit of 

each bin is equal to the upper limit of the previous bin while the upper limit 

can defined by the user (BIN_THRESHOLD_[X]). 
The counter "X" is incremented when the sampled temperature value is 

greater than the lower threshold value and less or equal than the higher 

limit. If the bin is not enabled, the temperature values in the interval defined 

by the corresponding bin are not counted. When the counter exceeds its own 

threshold limit an alarm is generated and recorded.
 For each histogram The Sample Time is programmable by setting its own 

BIN_SAMPLETIME_[X] register, and even dynamically modified inside it (under 

specific precision needs). Relative threshold alarms can be enabled or dis-

abled independently. 
Histogram bins configuration allow also to control the storage of the sam-

ples inside the logging memory: for each enabled bin the user can choose to 

store or not in the memory the temperature value and its time stamp 

(depending on the state of the corresponding bits in the BIN_ENA_SAMPLE_-

STORE_[X]) and the BIN_ENA_TIME_STORE_[X] registers). This helps for a bet-

ter handling of long term deliveries by memory saving. Time stamps storage 

helps  to keep track of the chronological sequences. This wide choice flexi-

bility allows the skilled programmer for a right trade-off between a fine 

grained information and a proper life-time / power consumption need.

Example of usage

Let suppose that the user wants to monitor the temperature trend for cooled 

food, we can define some histogram bins as follows: