INFICON Cygnus 2 Thin Film Deposition Controller - Manual (Page 154)

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Cygnus 2 Operating Manual
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.
Command = () ()
(...)
Command Group = 1 ASCII byte, specifying category of command:
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.
Command Sub-groups for command Q and U:
C - Source
G - General
I - Input Name.
L - Logic
M - Material
N - Material Name
O - Output Name
P - Process
S - Sensor
T - Type of Output
V – User Message
Command Sub-groups for command R and S:
G - General
L – Material
S – Sensor
Command ID = 1 binary byte. Defines specific command within some command
groups and sub-groups.
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