Varian Turbo-V 550 Manual De Instrucciones página 63

Request is an ASCII character identifying the action that
must be performed by the controller or the requested
information.
Allowed ASCII characters:
"A" = START
•
"B" = STOP
•
"C" = Low Speed ON
•
"D" = Low Speed OFF
•
"E" = Request for operational parameters
•
"F" = Pump times zeroing
•
"G" = Parameters reading
•
"H" = Parameters writing
•
"I" = Request for operating status
•
"J" = Request for numerical reading
•
"K" = Request for counters reading.
•
"L" = Software version
•
"N" = Print to host serial mode change
•
"O" = Host to print serial mode change
•
"P" = Front panel operation mode selection
•
"Q" = Remote operation mode selection
•
"R" = RS 232 operation mode selection
•
"S" + "number" = Baud rate selection
•
The command "N", "O", "P", "Q", "R" and "S" are always
acknowledged in any chosen operation mode.
CRC corresponds to the sum (with inverted sign) of all the
preceding bytes.
e.g., the START command "A" in ASCII
inverted it will be: FF + 1 - 41 = BF.
Character
code = 41;
"ACK"
"NACK"
Answer = after a request from the host, the Turbo-V550HT
controller will answer in one of the following ways:
ACK
•
NACK
•
Message
•
When the Request is "A, "B", "C", "D", "F", "N", "O", "P",
"Q", "R", the Turbo-V 550 controller will Answer the ACK or
NACK.
57
TECHNICAL INFORMATION
ASCII
for CRC calculation
"A" 41h
CRC -
"B" 42h
CRC -
"C" 43h
CRC -
"D" 44h
CRC -
"E" 45h
CRC -
"F" 46h
CRC -
"G" 47h
CRC -
"H" 48h
"I " 49h
CRC -
"J" 4Ah
CRC -
"K" 4Bh
CRC -
"L" 4Ch
CRC -
"N" 4Eh
CRC -
"O" 4Fh
CRC -
"P" 50h
CRC -
"Q" 51h
CRC -
"R" 52h
CRC -
"S" 53h
-
06h
CRC -
15h
CRC -
Converted ASCII
-
BFh
-
BEh
-
BDh
-
BCh
-
BBh
-
BAh
-
89h
-
-
B7h
-
B6h
-
B5h
-
B4h
-
B2h
-
B1h
-
B0h
-
AFh
-
AEh
-
-
FAh
-
EBh
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