2 Newbie Arduino questions

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has had problem arduino losing it's program?
scenerio: host program sending "commands" arduino(serial port) , works great.
the next day after powering arduino not respond host program. upload same i/o program , runs great again.

also:
everything comes arduino via serial port asc value?
can send integer, (example 1500) arduino , recognizes int 1500?

without knowing more arduino , host programs, impossible answer first question.
did try reset?

quote
everything comes arduino via serial port asc value?

no, binary value.
quote
can send integer, (example 1500) arduino , recognizes int 1500?

1500 decimal (0x5dc) requires @ least eleven bits represent, can't sent in single byte, send 0xdc , 0x05.


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