Dawn CONTROL-1500A Manual page 87

CONTROL-1500B Single Axis Antenna Controller
ANTENNA JOG COMMAND
This command jogs the antenna. The command contains 11 bytes. Here is the format of the
command;
byte 0:
byte 1:
byte 2:
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.
The format of the command is as follows;
byte 0:
byte 1:
byte 2:
byte 3:
byte 4:
byte 5:
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STX
where A is the CONTROL-1500 address
A
33h the command code
direction this field can specify 'E', 'W', 'D', 'U' or 'X'. 'E' or 'D' specifies
counterclockwise (CCW) movement for the CONTROL-1500A and down
movement for the CONTROL-1500B, 'W' or 'U' specifies clockwise (CW)
movement for the CONTROL-1500A or up movement for the
CONTROL-1500B. An 'X' specifies that the antenna stop moving.
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 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
'chksum' the checksum
STX
A where A is the CONTROL-1500 address
34h the command code
'X' the polarization movement code
ETX
checksum
Appendix E Communications Protocol 80