MATLAB: Is there a bug ? when use the serial receive data in 2012B

Question

I use the serial(2012B) receive data, sent data is OK, get suspension when the serial has data to receive. But the same program work well in 2011b;

Answer 1

I solve the problom, serConn = serial(serPort, 'TimeOut', 0.15, ...

in 2012B, timeout must be integer; like this
      serConn = serial(serPort, 'TimeOut', 1, ...
   But what is the units ?  1 Second or millisecond?