Teledyne T100, Instruction Manual, Page: 159 / 404

Teledyne ML - T100 UV Fluorescence SO2 Analyzer Remote Operation & Advanced Features
159
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 DAS
data channels, by name. When using these commands, you must type the entire name of
the item; you cannot abbreviate any names.
5.3.2.5. 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 (refer to Section 5.1.4 and
Table 5-4).
Status reports include DAS data (when reporting is enabled), warning messages,
calibration and diagnostic status messages. Refer to Appendix A-3 for a list of the
possible messages, and this section for information on controlling the instrument
through the RS-232 interface.
G
ENERAL
M
ESSAGE
F
ORMAT
All messages from the instrument (including those in response to a command line
request) are in the format:
X DDD:HH:MM [Id] MESSAGE<CRLF>
Where:
X is a command type designator, a single character indicating the
message type, as shown in the Table 6-25.
DDD:HH:MM is the time stamp, the date and time when the message was issued. It
consists of the Day-of-year (DDD) as a number from 1 to 366, the hour
of the day (HH) as a number from 00 to 23, and the minute (MM) as a
number from 00 to 59.
[ID] is the analyzer ID, a number with 1 to 4 digits.
MESSAGE is the message content that may contain warning messages, test
measurements, DAS reports, variable values, etc.
<CRLF> is a carriage return / line feed pair, which terminates the message.
The uniform nature of the output messages makes it easy for a host computer to parse
them into an easy structure. Keep in mind that the front panel display does not give any
information on the time a message was issued, hence it is useful to log such messages
for trouble-shooting and reference purposes. Terminal emulation programs such as
HyperTerminal can capture these messages to text files for later review.