Measurement-computing CB-COM-7013 Manuel d'utilisateur télécharger pdf (Page 15)

CB-7013, CB-7033 User’s Manual

2. Command

Command Format; (Leading)(Address)(Command)[CHK](cr)

Response Format: (Leading)(Address)(Data)[CHK](cr)

[CHK] 2-character checksum

(cr) end-of-command character, character return (0x0D)

Calculate Checksum:

1. Calculate ASCII sum of all characters of command (or

response) string except the character return (cr).

2. Mask the sum of string with 0ffh.

Example:

Command string: $012(cr)

Sum of string = ‘$’+‘0’+‘1’+‘2’ = 24h+30h+31h+32h = B7h.

The checksum is B7h, and [CHK] = “B7”.

Command string with checksum: $012B7(cr).

Response string: !01200600(cr).

Sum of string: ‘!’+‘0’+‘1’+‘2’+‘0’+‘0’+‘6’+‘0’+‘0’

= 21h+30h+31h+32h+30h+30h+36h+30h+30h = 1AAh

The checksum is AAh, and [CHK] = “AA”.

Response string with checksum: !01200600AA(cr).

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Measurement-computing CB-COM-7013 Manuel d'utilisateur Page 15