Measurement-computing CB-7000 DIO Manuale Utente Scaricare il pdf (Pagina 26)

CB-7000 DIO Manual

2. Commands

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 re-

sponse) string except the carriage 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: !01400600(cr)

Sum of string: ‘!’+‘0’+‘1’+‘4’+‘0’+‘0’+‘6’+‘0’+‘0’

= 21h+30h+31h+34h+30h+30h+36h+30h+30h = 1ACh

The checksum is ACh, and [CHK] = “AC”

Response string with checksum: !01400600AC(cr)

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