NEC LCD4010-BK LCD4010 external control command - Page 5

6）Command reply The monitor replies to a query from the controller. "Command reply message" format depends on each command. Refer to section 5.5 "Commands message" for more details. 4.5 Check code Header Message Check code Delimiter Check code is the Block Check Code (BCC) between the Header and the End of Message except SOH. SOH Reserved Destination Source Type Length STX Data | | ETX Check code 27 26 25 24 23 22 21 20 D0 D1 D2 D3 D4 D5 D6 D7 | | Dn Dn+1 P P P P P P P P Dn+1 = D1 XOR D2 XOR D3 XOR ,,, Dn XOR: Exclusive OR Following is an example of a Check code (BCC) calculation. SOH Reserved 01 30 D0 D1 Destination Address 41 D2 Header Source Message Address type 30 45 D3 D4 Message length 30 41 D5 D6 Message STX OP code page OP code Set Value Check code Delimiter ETX (BCC) 02 30 30 31 30 30 30 36 34 03 77 0D D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 Check code (BCC) D17 = D1 xor D2 xor D3 xor ... xor D14 xor D15 xor D16 = 30h xor 41h xor 30h xor 45h xor 30h xor 41h xor 02h xor 30h xor 30h xor 31h xor 30h xor 30h xor 30h xor 36h xor 34h xor 03h = 77h 4.6 Delimiter Header Message Check code Packet delimiter code; ASCII CR(0Dh). Delimiter (5/37)