Omega Engineering OMR-6520, OMR-6510 manual How to Calculate Checksum Value, Format of OMR Commands

1.10.How to Calculate Checksum Value

Format of OMR Commands

(LeadingCode)(Addr)(Command)(Data)[Checksum]<CR>

When checksum is enable then [Checksum] is needed, it is 2-character.

[Checksum] = ((LeadingCode)+(Addr)+(Command)+(Data)) MOD 0x100

Example 1: checksum is disable

	User Command :		$012<CR>
	Response	:	!01400600
Example 2: checksum is enable
	User Command :		$012B7<CR>
	Response	:	!01400600AC
‘$’ = 0x24		‘0’ = 0x30		‘1’ = 0x31	‘2’ = 0x30
B7 = ( 0x24 + 0x30 + 0x31				+ 0x32 ) MOD 0x100
‘!’ = 0x24		‘0’ = 0x30		‘1’ = 0x31	‘4’ = 0x34
‘6’ = 0x36
AC = ( 0x24 + 0x30 + 0x31 + 0x34 + 0x30 + 0x30 + 0x36 + 0x30						+ 0x30 ) MOD 0x100

Introduction 1-7