INFICON Cygnus Thin Film Deposition Controller - Manual (Page 109)

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Cygnus Operating Manual
Details of the following are given later in the document.
Command Group = 1 ASCII byte, specifying category of command:
E = Echo
H = Hello
Q = Query
R = Remote Action
S = Status
U = Update
Command Sub-group = 1 ASCII byte, used with some command groups to
further specify commands:
For commands Q and U:
C = Channel
G = General
I = Input Name
L = Logic Statement
O= Output Name
T = Type of Output
For commands R and S:
C= Channel
G = General
No sub-groups are allowed for E and H commands.
Command ID = 1 binary byte. Defines specific command within
Group/Sub-group. See definitions under relevant commands.
Parameter = ||||
Byte = 1 byte
Integer = 4 byte, low to high
Float = 4 byte, ANSII standard, single precision, low to high
String = Null terminated series of ASCII characters
Checksum. . . . . . . . . . . . . . . . . . 1 byte, sum, modulo 256, of all bytes, not
including length. Modulo 256 is the numeric
value from 0 to 255 representing the modulo
256 remainder of the sum of the values of the
ASCII codes that comprise the response.