sessantaquattro user manual v1.1 - June 2017
pag. 12
When acting as an access point: a) one blink of the white LED indicates that the network has been
generated and is available for a connection by another device; b) two blinks indicate that a device
is connected to the network generated by sessantaquattro.
When configured to connect to an external WiFi network: a) one blink indicates that
sessantaquattro is active and is searching for one network; b) two blinks indicate that
sessantaquattro has successfully connected to an external network.
Regardless of the sessantaquattro role, three blinks indicate that sessantaquattro is connected as a
client to a TCP socked generated by a server device (usually the PC used for real time data display
and recording); four blinks indicate that sessantaquattro is transferring data through the TCP
socket to a server.
Using OT BioLab software the three blinks condition is never visible because the TCP socket is
opened when pressing the button of data transfer and, as soon as sessantaquattro is connected to
the socket, the data transfer begins. The three blinks condition can be useful for custom
development in the debugging phase to understand when the TCP socket is correctly created and
sessantaquattro is connected to it.
Blue LED
The blue LED reflect the state of the data logging on the MicroSD card. All the settings for the data
logging can be provided to sessantaquattro using the internal web page, including how to control
the start and stop recording.
One blink of the LED indicates that the recording on MicroSD card has armed and sessantaquattro
is waiting for the triggering event to start the recording. The typical trigger event to start a
recording is pressing the button, but more option are available using the configuration string sent
to sessantaquattro through the TCP socket. When starting an acquisition directly from the internal
web page or with the configuration string, the 1 blink state does not occur and the recording start
directly.
Two blinks of the blue LED reflect that data storing on the MicroSD card is in progress.
Red LED
The red LED is used to alert the user of an error or a critical condition.
One blink indicates that samples has been lost in the wireless data transfer. This happen when the
sessantaquattro internal data buffers are full and the transmission of data packet is not possible.
The acquisition of the next signal sample will create a reset of the internal data buffer with the loss
of an amount of data equal to the data buffers size (refer to section 8.2 for additional details).
