Function for CRC16

Hi

Could any one post a function which generates a Hexa Decimal CRC16 Polynom 0x8005

I have verified what would be the correct results with an online calculator.

Data sequence : 123456789

Result:BB3D

I am implementing a sender from a network monitoring system to a legacy alarm receiving panel that requires the hash in front of the string being sent. 

I have completed composing the the rest of the message and the sender function itself.

This is the the last missing peace.

Thanks in advance.