ADLINK ND-6013 - Manual (Page 40)

32 • Command Set
Format of NuDAM Commands
(Leading Code)(Addr)(Command)[Data][Checksum]
When checksum is enable then [Checksum] is needed, it is
2-character. Both command and response must append the checksum
characters.
How to calculate checksum value ?
[Checksum] =
( (LeadingCode)+(Addr)+(Command)+[Data] ) MOD
0x100
Example 1: checksum is disable
User Command: $012
Response:
!01400600
$ : LeadingCode
01 : Address
2 : Command (Read Configuration)
: Carriage return 0x0D
Example 2: checksum is enable
User Command: $012B7
Response:
!01400600AC
$ : LeadingCode
01 : Address
2 : Command (Read Configuration)
B7 : Checksum value
: Carriage return 0x0D
‘$’ = 0x24 ‘0’ = 0x30 ‘1’ = 0x31 ‘2’ = 0x32
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