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Model GFC7000E Instruction Manual Operating Instructions
04584 Rev A1 119
Table 6-27: Command Types
COMMAND COMMAND TYPE
C Calibration
D Diagnostic
L Logon
T Test measurement
V Variable
W Warning
6.13.2.4. Data Types
Data types consist of integers, hexadecimal integers, floating-point numbers, Boolean expressions
and text strings.
• Integer data are used to indicate integral quantities such as a number of records, a filter
length, etc. They consist of an optional plus or minus sign, followed by one or more digits.
For example, +1, -12, 123 are all valid integers.
• Hexadecimal integer data are used for the same purposes as integers. They consist of the
two characters “0x,” followed by one or more hexadecimal digits (0-9, A-F, a-f), which is
the ‘C’ programming language convention. No plus or minus sign is permitted. For
example, 0x1, 0x12, 0x1234abcd are all valid hexadecimal integers.
• Floating-point numbers are used to specify continuously variable values such as
temperature set points, time intervals, warning limits, voltages, etc. They consist of an
optional plus or minus sign, followed by zero or more digits, an optional decimal point, and
zero or more digits. (At least one digit must appear before or after the decimal point.)
Scientific notation is not permitted. For example, +1.0, 1234.5678, -0.1, 1 are all valid
floating-point numbers.
• Boolean expressions are used to specify the value of variables or I/O signals that may
assume only two values. They are denoted by the keywords ON and OFF.
• Text strings are used to represent data that cannot be easily represented by other data
types, such as data channel names, which may contain letters and numbers. They consist
of a quotation mark, followed by one or more printable characters, including spaces,
letters, numbers, and symbols, and a final quotation mark. For example, “a”, “1”,
“123abc”, and “()[]<>” are all valid text strings. It is not possible to include a quotation
mark character within a text string.
• Some commands allow you to access variables, messages, and other items, such as iDAS
data channels, by name. When using these commands, you must type the entire name of
the item; you cannot abbreviate any names.