Dawn CONTROL-1500A Manual page 86

Control-1500B Single Axis Antenna Controller
positions associated with that satellite. The satellite name should be in capital letters, left
justified and padded on the right with blanks in the sat_name/position field. Note that the
satellite name must exactly match one in the controller's non-volatile memory.
With this form of the command, the polarization field may contain either 'H', 'V', or ' ' (a blank,
20 hex or 32 decimal). If an 'H' or a 'V' is specified, in addition to positioning the antenna in
azimuth and elevation, the polarization control device will be commanded to go to the position
associated with either the horizontal (if 'H' is specified) or vertical (if 'V' is specified) polarization
specified for the satellite. If the field contains a blank the polarization is not changed. For
example, this command with 'H' in the polarization field and 'SBS 6' in the sat_name/position
field will specify an auto move to SBS 6 and the polarization will be adjusted to horizontal for
the SBS 6 satellite.
Form 2. If the sat_name/position field contains a valid antenna position the antenna will move
to the position specified. The first 5 characters of the sat_name/position field specify the
antenna position, the last 5 characters of the sat_name/position field will be ignored. Within the
first 5 characters of the sat_name/position field, the antenna position must be right justified and
left padded with zeroes. For example, a sat_name/position field value of '0152500000'
specifies an antenna position of 1525 counts. For the command to be accepted the position
must be within the antenna limits. For this form of the auto move command, only the blank
character is accepted in the polarization field. Note that the position must be specified in
position counts and not in an angle format.
Form 3. If the polarization field contains the 'P' character, the command is interpreted as a
go_to_polarization command. For this form of the command, the first 5 characters of the
sat_name/position field specify the target polarization position in the controller's internal
polarization position representation (polarization sub-field). See byte 32 of the device status
poll reply for more information on the internal polarization position representations for the
different types of polarization control devices. The polarization position in the polarization sub-
field must be right justified and left padded with zeroes. The second 5 characters of the
sat_name/position field must contain '00000'. For example, if the sat_name/position field
contains '0050000000' the polarization control device is commanded to adjust the polarization
to a position of 500.
The command contains 16 bytes. Here is the format;
byte 0:
byte 1:
byte 2:
byte 3:
byte 4-13:
byte 14:
byte 15:
The normal reply to this command will be the same as the reply to the status poll query except that the
sat_name/position field is outside of the limits for the relevant antenna axis a NAK reply will be
sent to the host.
DAWNco • 3340 S. Lapeer Rd • Orion, MI 48359-1320 • Ph (248) 391-9200 • Fax (248) 391-9207 • sales@DAWNco.com
STX
A where A is the CONTROL-1500 address
32h the auto move command code
polarization This field can specify 'H', 'V', ' ' (blank), or 'P'.
sat_name/position
This field specifies the satellite name or a target azimuth and elevation or
polarization position.
ETX
checksum
command code field will be '32h'. Note that if the satellite name is not
found, the auto pol system is enabled and a polarization is specified
within the command, or if a position specified in the
Appendix E Communications Protocol 79