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CONTROL-1500B Single Axis Antenna Controller
byte 33:
7
6
-
-
0
1
DAWNco • 3340 S. Lapeer Rd • Orion, MI 48359-1320 • Ph (248) 391-9200 • Fax (248) 391-9207 • sales@DAWNco.com
Internal position values in range of 1 to 660 are scaled to display as a
value of 0 to 98 on both the user interface and via bytes 24 and 25 of the
device status poll reply. To obtain the internal position from this byte and
bytes 24 and 25, use the following formula ...
internal_position = ((byte_24_25_position * 661) / 99) +
ls_nibble_byte_32
where ...
internal_position ... is the controller's internal Polarotor position
representation.
byte_24_25_position ... is the Polarotor position reported via byte 24 and
25 of the device status poll reply and displayed on the user interface (a
value in the range of 0 to 98).
ls_nibble_byte_32 ... is the least significant nibble (lower 4 bits) of this
byte.
Note that in the above equation the division is an integer division which
means that the result of the division should be rounded DOWN to the
closest integer value (i.e. (39 * 661) / 99 = 260).
When a Polarotor is present in the system the upper nibble of byte 32 will
be '0010'.
For the rotating feed, the internal polarization position and the
polarization position displayed via the user interface are the same and
will be a value in the range of 0 to 1023. For the rotating feed the user is
prompted to set CW and CC limits. When the polarization position is
less than or equal to the CW limit specified by the user the 'CW' banner
will be displayed. When the polarization position is greater than or equal
to the CC limit specified by the user, the CC banner will be displayed.
The polarization position given by bytes 24 and 25 of the device status
poll reply will be a value in the range of 0 to 92. When the rotating feed
is at a limit (or beyond) the byte 24,25 values will be 'CW' or 'CC'. To
obtain the internal polarization position for the rotating feed from this byte
and the value in bytes 24 and 25, use the following formula ...
internal_position = (byte_24_25_position * 11) + ls_nibble_byte_32
where the variables are as defined for the Polarotor case. Note that
when a rotating feed is present in the system, the upper nibble of byte 32
will be '0011'.
Track Mode submode or error status and track frequency band.
5
4
$
3
2
1
-
-
-
-
-
b1 b0 $
s
s
s
where
b1 b0
-- --
0 0
0 1
Appendix E
0
-
s
meaning
c band
k band
Communications Protocol
76
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