WT901SDCL | manual v0707 | http://wiki.wit-motion.com/english
2.4.2 Output Rate
The default return rate of the module is 10Hz, the highest return rate supports
200Hz.
10Hz refers to 10 packets returned every second. There contain 33bytes in a
data packet in default.
Reminder: If there being many types of return data and low baud rate of
communication, the module will automatically reduce the frequency and output
at a maximum allowable output rate. If the return rate is high, the baud rate
should be set higher, generally 115200.