RESEARCH CONCEPTS RC2000C Manual page 93

RC2000C Polar Tracking Antenna Controller
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 pair of azimuth and elevation positions the antenna will
move to the position specified. The first 5 characters of the sat_name/position field specify the azimuth position
(azimuth sub-field) and the last five characters specify the elevation position (elevation sub-field). Within each
of the sub-fields the position must be right justified and left padded with zeroes. For example, a
sat_name/position field value of '0152500750' specifies an azimuth position of 1525 counts and an elevation
position of 750. For the command to be accepted these positions must be within their respective limits for each
axis. 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.
AZIMUTH/ELEVATION JOG COMMAND
This command jogs the antenna in azimuth or elevation. The command contains 11 bytes. Here is the format
of the command;
byte 0:
byte 1:
byte 2:
byte 3:
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas 66218-9680 • USA
STX
A where A is the RC2000 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
STX
A where A is the RC2000 address
33h the command code
direction this field can specify 'E', 'W', 'D', 'U' or 'X'. 'E' refers to east, 'W' to
west, 'D' refers to down, and 'U' refers to up. An 'X' specifies that the
antenna stop moving.
Appendix E Communications Protocol 87
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