INFICON XTC/3 Thin Film Deposition Controller Operating Manual - Manual (Page 119)

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XTC/3 Operating Manual
Command Sub-group = 1 ASCII byte, used with some command groups to
further specify commands.
For command Q and U:
F – Film
G - General
I - Input
N - Film Name
O - Output
P - Process
T - Output Type
No sub-groups are allowed for H, E, S or R.
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
Checksum . . . . . . . . . . . . . . . . . . . . 1 byte, sum, modulo 256, of all bytes,
not including length.