how to calculate checksum for particular array?

[sachinmm]

hello...i want to calculate checksum for below given array....this is 24 byte array and last two byte for checksum==>

unsigned char ReadTemplate[]= {0x55,0xAA,0x0A,0x01,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0D,0x01};