Hampshire Controls Corp.
Revision 1.2
Temperature Transmitter Operating Instruction
Page 7 of 21
©2014
Power-up Sequence
There is no on/off switch on the Temperature Transmitter. The device will turn on when all
three batteries are inserted. The power-up sequence takes about 20 seconds, during which the
device will go through the following states:
For the first 10 seconds the LCD will show all segments and the STATUS LED will be solid red
. During this interval the device can be put into Web Configuration Mode or Calibration
Mode by pressing and holding the DISP/PROG or the MUTE/CAL button respectively. These
two modes are described later in this document.
If no buttons are pressed, after the 10 second delay has elapsed, the device will start its boot
procedure. The buzzer will emit a short beep and the LED will change to green
. The Wi-Fi
electronics will power-up, and the unit will try to connect to the network SSID which was
entered during the Web Configuration. During the connection attempt the STATUS LED will
quickly flash green
. If the connection is successful, the LED will slowly flash green 3
times
…
…
and then turn off. If the connection fails, the LED will blink red
once
every 5 seconds, until the next connection attempt (every 60 seconds).
NOTE: See Connecting to a Network (page 8) if the Temperature Transmitter fails to connect
on initial power-up.
If the Wi-Fi connection was successful, the LCD will display the following sequence:
The initials of Hampshire Controls Corp.
The firmware version number.
The current battery (cell) voltage.
Finally the current probe temperature.
Each value will be displayed for three seconds. After displaying the temperature, the LCD will
turn off (blank display). The device is now in its operational state. During normal operation the
probe temperature will be read, and a wireless temperature transmission will take place, every 3
minutes.
