RESEARCH CONCEPTS RC2000A DUAL AXIS Instructions Manual page 81

RC2000A Dual Axis Antenna Controller
byte 3:
byte 4:
bytes 5-8:
byte 9:
byte 10:
The reply to this command will be the same as the reply to the status poll query except that the
command code will be '33h'.
POLARIZATION COMMAND
The following command specifies a polarization jog. The command contains 6 bytes. Byte 3 can
contain one of the following values...
'C'... jog the polarization clockwise.
'W'... jog the polarization counter clockwise. Note that there is not a duration or a speed
associated with these commands. The duration is fixed and the speed increases as the
polarization continues its movement without being interrupted. An interruption occurs if
another command does not arrive before the previous polarization command
terminates.
'H'... move the polarotor to the preset horizontal position of the satellite closest to the
antenna's present azimuth position.
'V'... move the polarotor to the preset vertical position of the satellite closest to the antenna's
present azimuth position.
'D'... moves the feed to position associated with C band if a Two Port rotating feed is
specified in the Pol Control? CONFIG mode item.
'K'... moves the feed to position associated with Ku band if a Two Port rotating feed is
specified in the Pol Control? CONFIG mode item.
The format of the command is as follows;
byte 0:
byte 1:
byte 2:
byte 3:
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direction This field can specify 'E', 'W', 'D', 'U' or 'X'. 'E' refers to counter
clockwise, 'W' to clockwise, 'D' refers to down, and 'U' refers to
up.
An 'X' specifies that the antenna stop moving. Note that if a
rotating feed is present the rotating feed movement will
terminate when this command is received. Note that if the
Auto Pol feature is enabled when a stop command is received,
the Auto Pol feature will be disabled.
speed This field specifies the jog speed, either 'F' (Fast) or 'S' (Slow).
Note that this field must contain a valid value even if the
direction field specifies 'X' (Stop).
duration This field specifies the duration of the azimuth/elevation jog
command in milliseconds. The valid range of values for this
field is '0000' to '9999'. As a practical matter, the resolution of
the timer used to time the move is approximately 150
milliseconds, so any move will be for a time interval equal to a
multiple of approx. 150 milliseconds. Note that this command
must contain a valid value even if the direction field specifies
'X' (Stop).
ETX
checksum
STX
A where A is the RC2000 address
34h the command code
'X' the polarization movement code
Appendix E Communications Protocol
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