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8.2
C
ONNECTION TO WIRELESS NETWORK
The device can be connected and disconnected from the wireless network by
pressing for 5
seconds
the connection button on the front panel (see step 6 of paragraph 8.1).
If the device is disconnected, by pressing the connection button for 5 seconds the buzzer emits
a beep and the green RF LED blinks for one second to indicate the start of the connection pro-
cedure. If the device belongs to a wireless network and the base unit is reachable, once con-
nected, the buzzer emits a second beep and the green RF LED will blink during data transmis-
sion. If the device doesn’t belong to a wireless network or the base unit cannot be reached,
the second beep of the buzzer is not emitted and the red RF LED will blink.
If the device is connected, by pressing the connection button for 5 seconds the buzzer emits a
beep, the red RF LED activates for one second and the device is disconnected.
In data loggers with LCD display, the connection status is signaled also by the connection icon
on the display (see figure 3.6 at page 9):
•
the icon is steady on if the data logger is connected;
•
the icon blinks if the data logger is trying to connect (the icon will be steady on once
connected or will go on blinking if the base unit is not reachable o the data logger
doesn’t belong to a wireless network);
•
if the data logger is not connected, the icon has the aspect of a hang up phone in data
loggers with graphic LCD, and it is off in data loggers wit custom LCD.
PING function:
In the devices connected to a wireless network it is possible to check if the base unit can be
reached by briefly pressing the connection button: if the green RF LED is blinking, it means
that the base unit is reachable, otherwise it will be the red RF LED to blink.
8.3
D
ATA LOGGERS WITH
LCD
OPTION
According to the data logger model, the LCD display is custom (
L
option) or graphic (
G
option)
type. The display shows all quantities measured and calculated by the data logger along with
the following RF quantities:
•
RSSI
(
Received Signal Strength Indication
): received signal power;
•
PER
(
Packet Error Rate
): percentage of transmission errors;
•
RF Hops
: 1=direct transmission between data logger and base unit, 2= a repeater
added between data logger and base unit, 3=two repeaters added, etc.
The indications of connection status, logging (in progress/deactivated), and battery charge
level are displayed.
Fig. 8.3.1: custom LCD
In models with custom LCD that measure several quantities, the temperature is displayed in
the secondary line, except when a RF quantity appears in the main line; in that case the sec-
ondary line shows the number of RF hops.
Models with graphic LCD allow the simultaneous display of 3 measurements in the secondary
lines. The graphic display shows in addition the RF signal level and date & time.
Battery
level
Main line
Logging
status
Connection
status
Secondary line
RF interference
indicator
Measurement
unit
