WJ-8711A DIGITAL HF RECEIVER
RS-232 REMOTE OPERATION
4-3
4.3
COMMAND MESSAGE FORMATTING
Command messages for the WJ-8711A are exclusively ASCII-encoded data, consisting of
command headers and arguments. Command headers consist of three character mnemonics. All queries
consist of a command header, followed by a question mark (?). All command arguments are in the "forgiving"
numerical representation form (refer to
paragraph 4.3.3
).
Command messages are divided into two categories: receiver device messages and
communication messages. Refer to
paragraphs 4.4
and
4.5
respectively.
Multiple commands may be sent to the receiver at once by transmitting them as a string. All
commands in the string must be separated by a semicolon (;) (i.e., DET 1;BWS 4).
4.3.1
TERMINATORS FOR COMMANDS AND QUERIES
Terminators are used to signal the end of a command or string. When a properly formatted
message is ready to be sent, a LF (line feed) character should be entered. The LF character instructs the
receiver to process the preceding message(s).
The WJ-8711A also transmits a terminator when responding to queries. After the query
response is transmitted the receiver issues a CR,LF (carriage return, line feed characters), indicating end of
response.
4.3.2
FORMATS OF QUERY RESPONSES
The WJ-8711A transmits responses to queries in a fixed-field format. Query responses begin
with the three-letter mnemonic of the query in upper-case characters, followed by a numeric argument. In all
query responses, the mnemonic and argument are separated by a space. Numeric arguments are represented by
the least number of digits possible, while still representing the entire range of the value. If a negative value is
allowed for the argument, a positive or negative sign is always given. Responses due to multiple queries are
linked together in a query string, with each query and its argument separated with a semicolon from other
queries in the string. The WJ-8711A terminates all responses to single queries or query strings with the CR
(carriage return) and LF (line feed) characters.
4.3.3
REPRESENTATION OF NUMERIC ARGUMENTS
Arguments for commands and queries in this manual are represented by an nrX (where X is
either f, 1, or 2). The nrf representation is used for command numeric arguments. The nr1 and nr2 are used
for the representation of query response arguments.
Courtesy of http://BlackRadios.terryo.org
Содержание WJ-8711A
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