DATAQ DI 2008 "start" command and read data problem

DATAQ DI 2008 "start" command and read data problem

I only connect USB to my computer and double click the button change to CDC mode. (the LED is yellow)
I try some protocol (for example "info o" , "slist 0 0" is work fine), however when I try "start 0" command the device return lots of  garbled to me and also can't stop by "stop" command.
is hardware or protocol setting issue? 

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