Agilent Technologies TwisTorr 304 FS AG Notice De Mode D'emploi page 232

17 Technical Information
Letter Protocol Description
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CRC corresponds to the sum (with inverted sign) of all the
preceding bytes.
e.g., the START command "A" in ASCII code = 41 inverted it will
be: FF + 1 - 41 = BF.
Tab. 6
CHARACTER
"A"
CRC
"B"
CRC
"C"
CRC
"D"
CRC
"E"
CRC
"F"
CRC
"G"
CRC
"H"
"I "
CRC
"J"
CRC
232/301
"G" = Parameters reading
"H" = Parameters writing
"I" = Request for operating status
"J" = Request for numerical reading
"K" = Request for counters reading.
ASCII
41h
-
42h
-
43h
-
44h
-
45h
-
46h
-
47h
-
48h
49h
-
4Ah
-
TwisTorr 304 FS AG Rack Controller User Manual / 87-901-029-01 (E)
CONVERTED ASCII FOR CRC CALCULATION
-
BFh
-
BEh
-
BDh
-
BCh
-
BBh
-
BAh
-
89h
-
-
B7h
-
B6h