OT Bioelettronica Sessantaquattro+ User Manual page 15

Sessantaquattro+ User Manual v.2.0 – March 2023
Regardless of the Sessantaquattro+ role, three blinks indicate that Sessantaquattro+ is connected as a
client to a TCP socket 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 reflects 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 is ready 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 options 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 starts
instantly. 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+ device internal data
buffers are full, and the transmission of data packets 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
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