Function crc16 

pub fn crc16(data: &[u8]) -> u16

Computes the CRC-16/MODBUS of a byte slice.

This is the checksum a Modbus RTU frame ends with, and the reason a receiver can trust a frame that arrived over a long, electrically noisy cable: the polynomial is 0xA001 (the reflected form of 0x8005), the initial value is 0xFFFF, input and output are reflected, and there is no final inversion. A frame appends the result low byte first.

Arguments

• data - the bytes to check: the unit address through the end of the PDU, that is, the whole frame except the two CRC bytes themselves.

Returns

The 16-bit CRC.

Examples

use pamoja_modbus::crc16;

// The standard CRC-16/MODBUS check value over the ASCII digits "123456789".
assert_eq!(crc16(b"123456789"), 0x4B37);