help with check summ from PC to Radio

[ew1ln]

Hello ALL !
I'm try write programm for work with GM1200 or
like model via RIB. But i'm don't possible calculate
CRC alghoritm for extendet command from PC to TRX.
I have much correct command like this:

00 0A 1F 56 AE
00 0A 20 56 F3
00 0A 21 56 9A
00 0A 22 56 21
00 0A 23 56 48
00 0A 24 56 C8
00 0A 25 56 A1
00 0A 26 56 1A
00 0A 27 56 73

Last byte - CRC for all byte of string (exclude last byte)
Help pleas !