WJ-8611 DIGITAL VHF/UHF RECEIVER
REMOTE CONTROL
4-3
The command messages are divided into three categories, based on the
function of the message: They are: device message, communication
messages, and configuration messages. These message categories are
detailed in
Tables 4-1
,
Table 4-2
, and
Table 4-3
, respectively.
A command message may consist of a single command and its argument,
or multiple commands may be sent by transmitting the commands in a
string. All commands in the string must be separated by a semicolon (;)
(e.g., FRQ 20;DET 1 CR LF).
4.2.1 MESSAGE TERMINATORS
Message terminators are used to signal the end of a command or string of
commands. A properly formatted RS-232 or IEEE-488 message is sent
with a carriage return line feed terminator (CR LF), or just line feed (LF).
The receiver recognizes the LF character as the end of the message. When
responding to a query over the RS-232 interface, the receiver always
terminates its message with carriage return, line feed (CR LF). When
responding to a message over the IEEE-488 bus, the receiver always
terminates its message with carriage return, line feed (CR LF), and with
the EOI line of the interface (end or identify) set TRUE.
4.2.2 QUERY RESPONSE FORMATS
Query responses from the receiver are transmitted in a fixed-field format.
The response begins with the three-character mnemonic of the query (in
upper case characters), followed by a numeric argument. A space is
always inserted between the mnemonic and the argument. Numeric
arguments are represented with the least number of digits possible, while
still representing the entire range of the value. If a negative value is
allowed in 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 mnemonic and its argument separated from other queries
with a semicolon. The receiver always terminates the response message
with a carriage return, linefeed (CR LF).
4.2.3 NUMERIC ARGUMENT REPRESENTATION
Arguments for commands and queries are represented in this manual by an
nrX designation, where X is either f, 1, or 2). The nrf representation is
used for command numeric arguments. The nr1 and nr2 representation is
used for query response arguments.
Numeric arguments that are used with commands to the receiver are
accepted in a forgiving numeric representation (nrf). This implies that the
receiver is a forgiving listener. However, responses from the receiver are
always in a fixed nr1 or nr2 format. The specific description of the
numeric representations are as follows:
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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