Command DevSerReadRetry :

read a string from the serialline device in mode raw (no end
of string expected, just empty the entire serialline receiving buffer).
If read successfull, read again "nretry" times.

DevSerReadRetry Definition
Input Argument	Tango::DEV_LONG	number of reading retries
Output Argument	Tango::DEV_STRING	pointer to the string read updated
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command allowed for	All states	..