Burkert Type 8056 - Manual (Page 21)

- 21 - RS232_485_ETP_MODBUS_BU_REV02.doc
3.3.4. SERIAL PORT SETTINGS FOR RS 232 AND RS 485 PORT
Serial port settings:
• Data bits: 8
• Parity: none (no parity)
• Stop bits: 1
• Flow control: none (no control lines no xon/xoff characters used)
3.3.5. GENERAL INPUT SYSNTAX
The information are entered as text line strings, with one or more command-sequences terminated by the <CR>
character. The command-sequences are executed in the same order as they are found in the string. The execution of
the commands contained in the input string does not start until the <CR> character is received. The optional <LF>
character that may follows the <CR> is not considered but it is accepted because usually the Hyper-Terminal or
similar application sends also this extra character when the <CR> is sent.
As a rule, an input string is composed of one or more command-sequences, terminated by the <CR> character and
an optional <LF> character.
The command-sequence is composed by the following elements, exactly in this order:
A five-letter mnemonic command, always present
An operator, always present
An optional value, present only when requested by the operator type
An optional comment-separator, may be present if it is also present the value
A comment, present only if it is also present the comment-separator
An optional command-separator, present only if another command-sequence follows it
With the exception of the comment element, no other extra characters or spaces are allowed in the command-
sequence.
Command: The commands are always represented by a five-letters mnemonic code and are case insensitive, so for
example the command MODSV can be written “MODSV”, “Modsv”, “modsv”, “mOdSv” and in any combination of
upper / lower case letters.
Operator: The operators permit to choose one of the three possible functions associated to the command at which
they are attached and they are:
READ, indicated by the ? symbol. It is used to read values.
SET, indicated by the = symbol. It is used to set values.
HELP, indicated by the =? sequence of symbols. It is used to display a set of options or a range of permissible
values related to the command.
Value: The values can be numbers, strings or special formatted fields like the date / time or the IP addresses,
depending on what it is expected by the command.
Numeric values are always checked for validity range and strings are checked for length.