Serial Send Simulink block question: How is matrix data transmitted?

According to the documentation, this block can take matrix data and send it out the serial port. My question is how exactly is this done? Say I have an 4x1 vector of uint8 values called data:

1) Which value does it send first? data(1) or data(4)

2) Does it send each value separately, with its own stop and start bits? Or does it send all of the data at once with one stop and start bit for the whole matrix? In the case of the example, would it send four 8 bits numbers each with its own stop/start bits or would it send one 32 bit number with a start/stop bit?

Thank you.

[Anthony]

I know this is 6 years old, but I'm also looking for some information on these exact questions.