RESEARCH CONCEPTS RC2000C Manual page 92

86 RC2000C Polar Tracking Antenna Controller
a a a a
- - - -
byte 36:
byte 37:
QUERY NAME COMMAND
This query command instructs the RC2000 to send back to the host computer an indexed satellite name from
the list of located satellites stored in non-volatile memory. This list is comprised of those satellites that were
saved via SETUP mode in the RC2000. A maximum of 50 can be in the list. This query command contains 7
bytes and the format is;
byte 0:
byte 1:
byte 2:
bytes 3,4:
byte 5:
byte 6:
The normal response to this query command contains 19 bytes and the format is as follows;
byte 0:
byte 1:
byte 2:
bytes 3,4:
bytes 5,6:
bytes 7-16:
byte 17:
byte 18:
Note that if entry 'XX' does not exist in the list (or the list has no entries) the NAK reply will be sent back to the
host.
AUTO MOVE COMMAND
This command causes the controller to automatically position the antenna in either azimuth and elevation
and/or polarization. The command has 3 forms.
Form 1. If the sat_name/position field contains the name of a satellite saved via the controller's SETUP mode
the controller will position the antenna at the azimuth and elevation positions associated with that satellite. The
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obtained may not be reliable. If a 'go to' H or V polarization command
is received via the serial port the controller will execute the command
after the peaking operation is completed. The reply to a go_to
command will be an ACK.
A polarization jog command that is received during a peaking
operation will not be registered and executed later. The reply to the
command will be a NAK.
a
-
the five most significant bits of the agc input level on the agc channel
specified in byte 34.
ETX
checksum
STX
A where A is the RC2000 address
35h the query name command code
'XX' where XX is the index of the satellite name being requested. Normally
this would be '01' the first time through and then incremented until the
'YY' (YY being the last entry in the list) satellite name is read. The
maximum possible range for XX and YY is 1 through 50.
ETX
'chksum" the checksum
ACK
A where A is the RC2000 address
35h the query name command code
'XX' where XX is the index of the satellite name being requested.
'YY' where YY is the total number of satellite names contained in the list.
This field will contain the satellite name.
ETX
'chksum' the checksum
Appendix E Communications Protocol