Research Concepts RC1000 - Manual (Page 36)

QUERY COMMAND
This command instructs the RC1000A to send back all data as
displayed on the LCD. This includes azimuth and polarization position,
satellite name, all limit and status information, error conditions, and
comm-link status. The query command message consists of 5 bytes and the
format is
byte 0 : STX
byte 1 : 'AA' where AA is the RC1000A address
byte 2 : '31h' the query command code
byte 3 : ETX
byte 4 : 'chksum' the checksum
The response to this command will consist of 24 bytes, which will be a
combination of ascii and binary data fields. The binary data will be
placed in the lower nybble of a byte whose higher nybble will be
initialized to a value which will make the result an ascii character.
The idea with this response is to be able to reproduce the information
presented on the LCD to the user when manual mode is active. The format
of the response will be
byte 0 : ACK
byte 1 : 'AA' where AA is the RC1000A address
byte 2 : '31h' the query command code
byte 3 : 'F' or 'N' 'N' if the RC1k is in remote mode
(online), and 'F' (offline)
otherwise. Note that if the
device is not in remote mode,
commands cannot be accepted.
bytes 4-10 : Sat_Name This field will contain the
satellite name in upper case
letters. If the name does not
occupy the entire field the name
will be left justified and the
string will be padded with blanks.
If a satellite name is not
currently displayed, this field
will contain all blanks.
bytes 11-13: AZ position This field will contain the
current azimuth position,
formatted in a manner identical to
how the position is displayed on
the front of the unit, '000' to
'999'. Note the azimuth position
displayed is not the actual
azimuth count, which may be
greater than 999. The displayed
value is the actual count scaled
by the east and west limit counts
so that displayed position will
always be less than 1000.
bytes 14,15: Pol position
This field will contain the
current polarization position,
formatted in a manner identical to