====== GetCrc ======

''GetCrc variable, arrayName, byteLength''
| //variable// |String variable to store results (Integer type)  |
| //arrayName// |Array with data(Must be a Byte array) |
| //byteLength// | number of bytes to calculate CRC  |

//GetCrc// calculates a Circular Redundancy Check (CRC) when using MODBUS
RTU Master Mode. //GetCrc// will return a 16-bit integer CRC value of the
specified array, //arrayName//. You can set the number of bytes to use for the
CRC calculation from the the array starting at 0.

<code xbasic>
 Const Device = CB280
 OpenCom 1,115200,3,80,20
 Set Modbus 1,9
 Dim A(20) As Byte
 Dim B As Integer
 RamClear
 UsePin 0,Out
 UsePin 9,Out
 Set Ladder On
 A(0) = 9
 A(1) = 2
 A(2) = 3
 A(3) = 0
 A(4) = 10
 A(5) = 23
 GetCrc B,A,6 ' Store in variable B the CRC for 6 bytes of array A
 Debug Hex B,Cr
</code>

NOTE: Please use byte arrays when using this function.

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