D-Series Syringe Pumps - Isco

D Series Syringe Pumps
Section 6 Serial Interface
Examples
Frame is R304STOPD1[CR] =
(R) (3) (0) (4) (S) (T) (O) (P)
52H + 33H + 30H + 34H + 53H + 54H + 4FH + 50H + D1H = 300H
300H MODULO 256 = 00
It is important to note that all characters are converted to
the ASCII equivalent and added, except for the checksum.
The two characters of the checksum are converted to
hexadecimal numbers and concatenated to form a single
two-digit number. This number is then converted to its
ASCII equivalent and added to the end of the message.
Hexadecimal Format Using
MODULO
Step 1:
Step 2:
22FH = 52H + 33H + 30H + 34H + 53H + 54H +4FH + 50H
2FH = 22FH ··
2R2FH
100H
100H 22FH
Modulo
200H
2FH
Step 3:
D1H = 100H 2FH
Step 4: Convert D1H to ASCII (Hex) and put at end of message.
Step 5: Put a “CR” (0DH) at the end of message for end of frame.
Decimal Format Using
MODULO
Step 1:
Step 2:
559 = 82 + 51 + 48 + 52 + 83 + 84 + 79 + 80
47 = 559 ··
2R47
256
256 559
Modulo
512
47
Step 3:
209 = 256 47
Step 4: Convert 209 to ASCII (Hex) and put at end of message.
Step 5: Put a “CR” (13) at the end of message for end of frame.
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