Measuring Ampifier Type 2525
User Manual Vol.2
Brüel & Kjær
4–4
Chapter 4 – Syntax and Data Types
Formats for Interface Messages
message. Elongated, round-ended symbols indicate literal word data, such as message
headers.
Data items that may be by-passed, are indicated by angled lines to and from the
main flow line. Data items that may be repeated, are indicated by lines that loop
vertically from the main flow line back over the data item and back to the main flow
line. If an item of data is repeated, then the number of repetitions is indicated by
a number above the flowline. Flow is from left to right unless arrows indicate
otherwise.
4.1.3 General Rules for Constructing an Interface Message
The 2525 allows you to input the message headers and any character type data fields
in full. For ease of use, the data field names correspond to those on the amplifier’s
menu and screen texts wherever possible.
In order to reduce coding and transmission time, mnemonics can be entered for each
of the message components which use character type data. The mnemonics are
derived from the names of the individual headers or data fields, and their syntax is
the same for headers and character type data fields. In this manual a message’s
minimum allowable mnemonic is given in bold upper case text, for example
MEASUREMENT_MODE ACCELERATION. In addition, the following rules apply:
1. All entries can always be written out in full. For example,
MEASUREMENT_MODE ACCELERATION
2. Both upper and lower case letters are recognized and are equivalent:
Measurement_MODE accleraTION
3. All headers and character type data fields can be truncated to the mnemonic.
MEASUREMENT_MODE ACCELERATION
MEAS_MO ACCELER
M_M A
4. All mnemonics are unique and consist of one or more words, with each word
consisting of one to three characters, plus the word concatenators.
5. When the amplifier receives character type messages, it checks the entire mes-
sage. Therefore, any mis-spelled words are detected as unknown commands.
6. The amplifier returns the full message or only the mnemonics when transmit-
ting data containing headers and character type data fields over the bus. This is
determined by the setting of the parameter Header (see section 4.3.2).
7. Between the header and the first data field, a header separator is entered. The
header separator is a space (SP
).
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