CONTROL-
1500B Single Axis Antenna Controller Appendix E Communications Protocol
78
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 a a a a
- - - - -
the five most significant bits of the agc input level on the agc channel
specified in byte 34.
byte 36:
ETX
byte 37:
checksum
QUERY NAME COMMAND
This query command instructs the
CONTROL-
1500 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
CONTROL
1500. A maximum of
of
50 can be in the list. This query command contains 7 bytes and the format is;
byte 0:
STX
byte 1: A where A is the
CONTROL
1500 address
byte 2:
35h
the query name command code
bytes 3,4:
'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.
byte 5:
ETX
byte 6:
'chksum"
the checksum
The normal response to this query command contains 19 bytes and the format is as follows;
byte 0:
ACK
byte 1: A where A is the
Control
1500 address
byte 2:
35h
the query name command code
bytes 3,4:
'XX'
where XX is the index of the satellite name being requested.
bytes 5,6:
'YY'
where YY is the total number of satellite names contained in the list.
bytes 7-16:
This field will contain the satellite name.
byte 17:
ETX
byte 18:
'chksum'
the checksum
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
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