Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 187)

Model 9110TH NOx Analyzer Remote Operation
Teledyne Analytical Instruments 187
L Logon
T Test measurement
V Variable
W Warning
8.2.1.3. 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 key words 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. When using these
commands, you must type the entire name of the item; you cannot abbreviate any names.
8.2.1.4. Status Reporting
Reporting of status messages as an audit trail is one of the three principal uses for the RS-232 interface
(the other two being the command line interface for controlling the instrument and the download of data
in electronic format). You can effectively disable the reporting feature by setting the interface to quiet
mode (Section 6.2.1, Table 6-1).
Status reports include warning messages, calibration and diagnostic status messages. Refer to Appendix
A-3 for a list of the possible messages, and this for information on controlling the instrument through the
RS-232 interface.
8.2.1.5. General Message Format
All messages from the instrument (including those in response to a command line request) are in the
format: