ADLINK ND-6510 - Manual (Page 14)

10 • Introduction
1.10. How to Calculate Checksum Value
Format of NuDAM Commands
(LeadingCode)(Addr)(Command)(Data)[Checksum]
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
Response : !01400600
Example 2: checksum is enable
User Command : $012B7
Response : !01400600AC
‘$’ = 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